Full comparison of Flysky Noble NB4+ vs NB4 Pro+: 18ch, beginner mode, premium bundle, steering wheel size, and wireless charging dock. Find the right Noble transmitter for RC cars and boats at SoarSky.
Full comparison of Flysky Noble NB4+ vs NB4 Pro+: 18ch, beginner mode, premium bundle, steering wheel size, and wireless charging dock. Find the right Noble transmitter for RC cars and boats at SoarSky.
The Flysky Paladin PL18 Ultra is an 18-channel flagship RC transmitter featuring AFHDS3, EdgeTX support, 657-LUX outdoor IPS screen, adjustable Hall gimbals, and dedicated DLG glider mode. Available at SoarSky.
Last Updated: September 2026 | Reading Time: 16 minutes | Difficulty: Intermediate | Author: Dannyi Chen
Dannyi Chen — RC Enthusiast & Technical Writer at SoarSky. Long-term tester of the Flysky transmitter and receiver lineup, focused on in-depth comparisons for fixed-wing and FPV gear.
⚡ Quick Answer
The FS-ST16 and FS-ST8 are both 2.4GHz Flysky transmitters running the ANT protocol. The core differences: the FS-ST16 offers 16 channels, a 3.5" 320×480 color IPS display (non-touch), 18650×2 or 2S LiPo power with Type-C charging, internal + external folding dual antennas, up to 5 flight modes, a full fixed-wing flap system (camber/crow/airbrake), and can be flashed to EdgeTX via the official Flysky Open Source Assistant. The FS-ST8 offers 8–12 channels, a 128×64 monochrome LCD, 4×AA or 2S LiPo power (no charging port), internal dual antennas and 3 flight modes — winning on 420g light weight and a $69.99 price. Both share 4096-step resolution, two-way transmission, RSSI telemetry, failsafe and trainer mode. For fixed-wing pilots: a trainer is fine on the ST8; flapped, retract-equipped or multi-surface models — or a buy-once-cry-once radio — point to the FS-ST16. (Source: Flysky official specifications)
Table of Contents
I. What Are the Core Differences Between the FS-ST16 and FS-ST8?
II. 58-Spec Comparison: Where Does the FS-ST16 Beat the FS-ST8?
III. What Does a Fixed-Wing Model Need From a Radio — Do These Two Deliver?
IV. Can the FS-ST16 Run EdgeTX?
V. Which Pilot Should Choose the FS-ST16 vs the FS-ST8?
VI. Editorial Hands-On Notes & Community Feedback
VII. FAQ
VIII. Where to Buy the FS-ST16 and FS-ST8
What Are the Core Differences Between the FS-ST16 and FS-ST8?
The core difference fits in one sentence: the FS-ST16 is a 16-channel color-screen flagship aimed at fixed-wing and multi-model pilots, while the FS-ST8 is a lightweight 8–12 channel entry-level workhorse. Both share the same ANT automatic frequency-hopping system, 4096-step gimbal resolution and the FS-SR8/SR8A receiver ecosystem — but they are aimed at very different budgets and cockpits.
This article is based on a page-by-page reading of both official user manuals (FS-ST16 manual, Sep 2025 edition; FS-ST8 manual, Apr 2025 edition) and the Flysky official specification pages, and it corrects several outdated claims from the previous version of this post.
FS-ST16 front: 3.5" color screen + 6 shortcut keys — available at SoarSky
FS-ST8 front: 128×64 monochrome LCD + roller navigation — available at SoarSky
⚠️ Important: Corrections in this revision — ① the FS-ST16's 3.5" color screen is a non-touch IPS panel (navigation is via roller and physical keys), not a touchscreen as previously stated; ② both transmitters use the ANT protocol natively, which is incompatible with AFHDS 2A / AFHDS 3 — AFHDS 3 support requires the FRM303 external RF module; ③ the FS-ST8 runs on 4×AA or a 2S LiPo, not "6×AA"; ④ the FS-ST16 is powered by 18650×2 or a 2S LiPo, not a built-in 2000mAh battery. (Source: Flysky ST16 official specifications / Flysky ST8 official specifications)
The Five Big Upgrades of the FS-ST16 Over the FS-ST8
The FS-ST16's upgrades cluster around channel expansion, human-machine interaction, power, software features and open-source support:
① Doubled channels: 16 vs 8–12 channels — enough for multi-surface fixed-wing models (dual ailerons + dual flaps + rudder + elevator + throttle + retracts + lights) with room left for gimbals, drop mechanisms and more.
② A generational screen jump: 3.5" 320×480 full-color IPS vs 128×64 monochrome dot-matrix LCD — menu density and sunlight readability are in different leagues.
③ Power & charging: 18650×2 or 2S LiPo with Type-C charging vs 4×AA or 2S LiPo with no charging port — far lower long-term running cost.
④ Software depth: 5 flight modes (vs 3), 10 dual-rate groups (vs 4), 11-point throttle/pitch curves (vs 7 points), voice alerts, 4 timer types, and a complete fixed-wing flap system (camber flaps, brake flaps, butterfly/crow, airbrake).
⑤ Open-source firmware: the ST16 is one of only two radios currently supported by Flysky's official Open Source Assistant and can be flashed to EdgeTX (see Section IV).
For a hands-on look at the FS-ST16's build quality, unboxing contents and real-world first impressions, watch the WTFRC unboxing review:
WTFRC: Flysky FS-ST16 Unboxing & Review (YouTube)
Why the FS-ST8 Still Exists
The FS-ST8 hasn't been made obsolete — at 420g it is 245g lighter than the ST16, making long handheld or neck-strap sessions noticeably easier; at $69.99 it costs roughly a third of the ST16; and it offers wireless trainer capability (via the FS-WTM01 module) that the ST16 manual doesn't mention, plus an official Hall gimbal upgrade kit. For flight instructors and budget-conscious beginners, it remains the most pragmatic choice.
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58-Spec Comparison: Where Does the FS-ST16 Beat the FS-ST8?
Across 58 comparison dimensions, the FS-ST16 wins roughly two-thirds of them, while the FS-ST8 keeps its edge in weight, price, wireless trainer and Hall-gimbal upgrade options. All data below comes from the specification tables and function chapters of both official manuals (2025 editions); items not stated in the manuals are supplemented from official pages or third-party retail specifications and are individually noted.
Core Hardware Specifications
Specification
✦ FS-ST16
FS-ST8
Channels
16 channels
8–12 channels (configurable)
Supported models
Fixed-wing, glider, helicopter, multirotor, car (wheeled/tracked), boat, robot — 7 types
Fixed-wing, delta wing, glider, helicopter, multirotor, FPV drone, car, engineering vehicle, robot, boat
RF frequency
2.4GHz ISM
2.4GHz ISM
Protocol
ANT (enhanced) natively; AFHDS 3 via FRM303 external module; supports PPM/S.BUS/CRSF modules
ANT natively; AFHDS 3 (3rd-gen) receivers via FRM303 module; supports CRSF/CRSF2 modules
One-way / two-way
Both binding modes supported, two-way by default
Both binding modes supported, two-way by default
Transmit power
<20dBm; up to 2W with FRM303 (external power)
<20dBm; up to 2W with FRM303 (external power)
Power consumption
Input 6–9V/DC (operating current not stated in manual)
1.5V AA×4 or 2S LiPo (consumption not stated in manual)
Control range (open air, interference-free)
Not stated in manual; third-party retail specs list ≥1500m
>1000m
System latency
No ms figure in manual; Fast mode lowers latency; SR(833Hz)/SFR(1000Hz) servo rates reduce system latency further
No ms figure in manual; FAST mode is low-latency and low-power
Signal strength telemetry
Home screen shows RSSI, TX/RX voltage, BVD voltage; low-signal alarm; channel output supported
7 telemetry items (incl. RSSI, SNR, noise); SR8 outputs signal strength to FC via CH14
Supported batteries
18650×2 or 2S LiPo (JST/balance lead), 6–9V/DC
1.5V AA×4 or 2S LiPo (JST)
Charging
Yes — Type-C charging
No charging port
Dimensions
224.1×180×101.3mm
176×210.9×82.5mm
Weight
665g
420g
Languages
English / Simplified Chinese
Not stated in manual
Operating temperature
-10℃ ~ +60℃
-10℃ ~ +60℃
Humidity range
20% ~ 95%
20% ~ 95%
Certifications
CE, FCC ID: 2A2UNST1600
CE, FCC ID: N4ZST800
Model memory
40 models per official launch material (not stated in manual)
10 models (manual); model-combo switching via a switch
Gimbal channel resolution
4096 steps
4096 steps
Screen
3.5" 320×480 full-dot-matrix color IPS (non-touch)
128×64 full-dot-matrix monochrome LCD
Source: Flysky FS-ST16 / FS-ST8 official user manuals, specification tables (2025 editions); ST16 model memory and range from the Flysky official launch announcement and third-party retail specifications
FS-ST8 battery bay: 4×AA or 2S LiPo (JST) with no onboard charging; the ST16 runs 18650×2/2S with direct Type-C charging — available at SoarSky
Controls, Interfaces & Interaction
Specification
✦ FS-ST16
FS-ST8
Auxiliary channel controls
6 toggle switches (SWA–SWF) + 2 knobs (VRA/VRB) + 2 self-centering dials (VRC/VRD) + 4 rear buttons + 6 customizable shortcut keys
4 toggle switches (SWA–SWD) + 2 knobs + roller; upgraded version adds 2 dials (VRC/VRD) + 2 rear buttons
Trim buttons
TR1–TR4 (4 total), four trim modes: shift / center-max / high-max / low-max
T1/T2, T3/T4 trim button pairs, adjustable step size
Data interfaces
USB Type-C, 3.5mm DSC, SD card slot, Stealth I/O module bay, S.port/PPM
USB Type-C, 3.5mm audio (trainer) jack, Stealth I/O module bay
Antenna
Internal single + external folding antenna (dual), top SMA port reserved for upgrades
Internal dual antennas, SMA port reserved (FS-FRA01 external antenna kit optional)
Alarm types
Sound + vibration + voice announcements; low-signal / telemetry / sensor / low-voltage / idle / timer alarms
Sound + vibration; throttle / idle / voltage / low-signal / telemetry-loss / timer alarms
Ambient lighting
Main ring around gimbal bases + shortcut-key secondary lights; 8 colors/rainbow, battery or throttle indication modes
Multi-color LED indicator, 8 colors/rainbow, can show battery level
Switch/knob/button customization
Full 16-channel function assignment; logic switches (LSW1–4, AND/OR/XOR); latched/momentary/continuous switch types; customizable shortcut keys
Control assignment (switches/dials/rear buttons/knobs); CH5–CH12 freely assignable; 3-position switch usable as 2-position
Phone / FPV mount
Front-panel phone mount holes; adjustable mobile holder optional; no dedicated FPV mount
Phone mount nut on body; mobile holder optional on upgraded version; no dedicated FPV mount
Simulator
3.5mm DSC port (usage not detailed in manual)
USB Type-C as HID device, auto-recognized; all system functions work in simulators
Hall gimbals
Not mentioned in manual (gimbal bases are replaceable)
Ships with potentiometer gimbals; official Flysky Hall gimbal bases available as a DIY upgrade
Source: Flysky FS-ST16 / FS-ST8 official user manuals (2025 editions)
FS-ST8 interface area: USB Type-C (firmware/simulator) and the rear Stealth I/O module bay — available at SoarSky
Receiver & Sensor Ecosystem
Specification
✦ FS-ST16
FS-ST8
Bundled receiver
FS-SR8 or FS-SR8A ×1 (varies by bundle)
FS-SR8 ×1
Supported standard receivers
ANT receivers such as FS-SR8/SR8A; AFHDS 3 classic/enhanced receivers via FRM303 module
ANT receivers such as FS-SR8; Flysky 3rd-gen (AFHDS 3) receivers via FRM303 module
Supported special receivers
FS-CEV04 i-BUS serial bus receiver
FS-CEV04 i-BUS serial bus receiver
i-BUS expansion receiver FS-CEV04
Supported. Connect to receiver SERVO port, pick the channel in [i-BUS settings], press K1–K4 on the CEV04 to map to C1–C4 servo ports (requires separate power)
Supported. Same procedure; output mode must be i-BUS (requires separate power)
Compatible sensors
FS-CAT01 (altitude), FS-CPD01/CPD02 (speed), FS-CVT01 (voltage), FS-CTM01 (temperature), FS-CGPS01 (GPS); up to 15 in series
Same 6 i-BUS sensors; up to 15 in series
GPS sensor
FS-CGPS01: speed, distance, altitude, coordinates, satellite count, date/time; calibration/timezone/home-point reset
FS-CGPS01: fix status, satellites, ground distance/speed, altitude, heading, coordinates
Other optional accessories
FRM303 module, FGPZ03/FGPZ05 adapters, 2.4G SMA antenna kit, mobile holder, i-BUS sensors, FS-CEV04 (throttle ratchet plate included)
Mobile holder, FS-FRA01 external antenna kit, FGPZ03/04/05 adapters, throttle self-centering/ratchet kits, FS-WTM01 wireless trainer module, FRM303, Hall gimbal bases
Bundled receiver specs
FS-SR8/SR8A: 8ch, PWM/PPM/i-BUS/S.BUS, 3.5–9V, 44.8×26.6×11.3mm, 10g/13g, dual antennas
FS-SR8: 8ch, PWM/PPM/i-BUS/S.BUS, >1000m, 3.5–9V, 10g, external dual antennas
Source: Flysky FS-ST16 / FS-ST8 official user manuals (2025 editions) and FS-SR8 official specifications
FS-ST16 full package: transmitter + FS-SR8 receiver + Type-C cable + throttle ratchet plate — available at SoarSky
Software & Mixing Features
Specification
✦ FS-ST16
FS-ST8
Mixing
Programmable mixes + 20+ dedicated mixes: aileron differential, elevon, rudder coupling, flap linkages, V-tail, butterfly/crow, airbrake, spoiler, throttle mixing, twin-engine and more
Up to 8 custom mixes + dedicated delta-wing / V-tail mixes
Track (tank) mixing
Supported (tracked car / robot models, with F/B/L/R rates)
Supported (engineering vehicle / robot models, differential steering)
Timers
4 types: Timer 1/2, engine timer (throttle-triggered), model timer
2 independent timers with throttle trigger and alarms
Rates & curves
EXP1/EXP2 curves; 10 dual-rate groups; throttle/pitch curves up to 11 points
Rate/expo curves (CH1/2/4); 4 dual-rate groups; 7-point throttle curve
Throttle lock
Supported (throttle hold), plus throttle cut and idle-down
Supported (throttle lock; other channels keep working while locked)
Delta-wing (elevon) mixing
Supported (tailless layout + elevon mixing + dedicated V-tail mixing)
Supported (delta-wing mixing + V-tail mixing)
Flight modes
Up to 5, with create/copy/rename/reorder; functions, dual rates and curves can be set per mode
3, switch-assignable
Multirotor flight modes
Supported (multirotor models include flight-mode settings)
Generic 3 modes (no dedicated multirotor FC modes)
External RF module
Stealth I/O bay + reserved power slot; supports FRM303 (AFHDS 3)/PPM/S.BUS/CRSF
Stealth I/O bay (no power; adapter + separate power needed); supports FRM303/CRSF/CRSF2
Trainer mode
Wired (PPM, coach/student modes, 4–16 channels configurable)
Wired (3.5mm trainer cable) + wireless (via FS-WTM01 module)
Failsafe
Per-channel settings (no output / fixed output), 250–1000ms judgment time
Per-channel settings (no output / fixed output), 250–1000ms judgment time
Servo frequency
Analog 50Hz / digital 333Hz; SR(833Hz)/SFR(1000Hz) via FRM303 enhanced receivers
Analog 50Hz / digital 333Hz / other 50–400Hz; SR(833Hz)/SFR(1000Hz) via FRM303
Model copy & backup
Model copy; SD card slot present (backup not documented in manual)
Model copy + model combo; no external backup interface
Factory reset
Supported
Supported (factory reset / model reset)
Firmware updates
FlySky Assistant / USB Type-C; plus official Open Source Assistant for EdgeTX flashing
FlySky Assistant / USB Type-C (incl. forced-update mode)
Gimbal mode change (Mode 1/2/3/4)
Modes 1–4, software switch + mechanical gimbal adjustment; throttle self-centering via rear screw
Modes 1–4; M2/M4↔M1/M3 requires opening the case and swapping gimbal bases
Gimbal calibration
Supported (both gimbals + VRA/VRB knobs + VRC/VRD dials)
Supported
Source: Flysky FS-ST16 / FS-ST8 official user manuals, function chapters (2025 editions)
💡 Tip: Both transmitters run the ANT protocol natively and are not compatible with AFHDS 2A / AFHDS 3 receivers. If you already own AFHDS 3 receivers (e.g. FTr10, FTr8B), you'll need the FRM303 external module; when buying receivers, look for "ANT protocol" models (FS-SR8/SR8A, etc.).
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What Does a Fixed-Wing Model Need From a Radio — Do These Two Deliver?
Fixed-wing models demand enough channels, wing mixing (elevon/V-tail/flaps), dual rates & expo, trims and servo travel, failsafe, trainer mode, timers and telemetry — the FS-ST16 checks every box with room to spare, and the FS-ST8 checks all but the advanced flap mixes. Each requirement below reflects fixed-wing buying guidance from RC communities (Flite Test, RC Plane Lab, Stevens AeroModel and others), cross-checked against both manuals:
Fixed-wing requirement (why it matters)
✦ FS-ST16
FS-ST8
≥6 channels (throttle/aileron/elevator/rudder as the base 4; flaps, retracts and lights each need one more)
✅ 16 channels, ample headroom
✅ 8–12 channels, covers typical models
Elevon / V-tail mixing (essential for flying wings and V-tails, otherwise an external mixer is needed)
✅ Tailless layout + elevon mixing + dedicated V-tail mixing
✅ Delta-wing mixing + V-tail mixing
Flap / flaperon functions (key for scale models and gliders to slow down and add lift on landing)
✅ Full flap system: flap settings, camber flaps, brake flaps, butterfly/crow, airbrake
⚠️ No dedicated flap functions in the manual; approximate via custom mixes
Dual rates & expo (limit total travel + soften stick response around center to avoid twitchiness)
✅ 10 dual-rate groups + EXP1/EXP2 curves
✅ 4 dual-rate groups + expo curves
Trims / subtrims / servo travel (center surfaces at setup, prevent servo binding and burnout)
✅ 4 trim keys + servo travel (incl. neutral trim) + channel reverse
✅ Trim buttons + servo travel (incl. neutral trim) + channel reverse
Failsafe (cut throttle and center surfaces on signal loss — set and ground-test before every first flight)
✅ Per-channel, 250–1000ms adjustable
✅ Per-channel, 250–1000ms adjustable
Trainer mode (instant instructor takeover — the #1 "save" feature)
✅ Wired trainer (PPM)
✅ Wired + wireless trainer (FS-WTM01 module)
Timer (match flight time to battery capacity, avoid dead-stick landings)
✅ 4 timer types incl. engine timer
✅ 2 timers with throttle trigger
Telemetry / signal-strength feedback (variometer-style altitude for gliders, link monitoring for long-range)
✅ RSSI + voltages + 6 sensors + GPS
✅ RSSI + voltages + 6 sensors + GPS
Model memory (separate settings per airframe — flying the wrong memory is a classic crash cause)
✅ 40 models (official launch material)
✅ 10 models + combo quick-switching
2.4GHz with adequate range
✅ 2.4GHz ANT, external folding antenna (retail spec ≥1500m)
✅ 2.4GHz ANT, >1000m
Requirement sources: fixed-wing buying and setup guides from Flite Test, FMS Hobby, RC Plane Lab, Stevens AeroModel, AMain Hobbies; capability check: official manuals of both transmitters
At 420g, the FS-ST8 stays comfortable during long fixed-wing sessions — available at SoarSky
✅ Bottom line: Trainers, entry gliders and 4–6 channel sport planes — the FS-ST8 is fully sufficient. Flapped scale models/gliders, retracts, multi-surface airframes, or pilots who want 5 flight modes to manage takeoff/cruise/landing configurations — the FS-ST16 is clearly the better fit; its complete flap system (camber, brake, butterfly/crow, airbrake) is rare at this price.
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Can the FS-ST16 Run EdgeTX?
Yes — the FS-ST16 is one of only two radios currently supported by Flysky's official Open Source Assistant (FlySky Firmware Flash System) (the other being the PL18 Ultra), letting you flash freely between the Flysky OS and open-source EdgeTX; the EdgeTX official supported-radios list has included the Flysky ST16 as "limited support" since v2.11.
Flashing path: open firmwareswitcher.flyskytech.com/en in your browser → choose "EdgeTX (Rewrite as an open-source system)" → download the SD card files as prompted and connect the transmitter to flash; to return to stock, choose "Rewriting as a closed-source system".
For the actual flashing procedure, follow WTFRC's complete FS-ST16 EdgeTX tutorial:
WTFRC: Flysky FS-ST16 EdgeTX Flashing Tutorial (YouTube)
💡 Tip: For more flashing tutorials and the latest firmware notes, check the official Flysky Open Source Assistant website.
⚠️ Important: ① EdgeTX support for the ST16 is currently limited — community reports indicate the internal ANT RF is unusable under EdgeTX, so you'll need an external module (CRSF/ELRS class); confirm your receiver setup before flashing. ② Flashing carries risk — back up first and follow the official page exactly. ③ The FS-ST8 is not supported by the official switching tool.
Once on EdgeTX, the ST16's 16-channel hardware gains the full EdgeTX feature set: unlimited mixes and logic switches, Lua scripts, flexible telemetry, and the global open-source ecosystem of themes and voice packs. This is the ST16's most "future-proof" advantage over the ST8.
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Which Pilot Should Choose the FS-ST16 vs the FS-ST8?
Choose by budget and airframe: the $199 FS-ST16 suits multi-surface fixed-wing pilots and advanced users buying once for the long term, while the $69.99 FS-ST8 suits beginner trainers, instructor fleets and price-sensitive pilots.
Choose the FS-ST16 if you —
fly flapped scale models/gliders and want camber flaps, butterfly/crow and airbrake mixes;
need more than 12 channels (multi-surface + retracts + lights + gimbal);
want 5 flight modes for takeoff/cruise/landing configurations, or 10 dual-rate groups for fine tuning;
value the color screen, voice announcements, Type-C charging and external folding antenna;
want to explore the EdgeTX ecosystem, or simply don't want to upgrade again later.
Choose the FS-ST8 if you —
are just starting out with a 4–6 channel trainer or small electric fixed-wing;
are an instructor or club needing wireless trainer (FS-WTM01) for fleet training;
are on a tight budget ($69.99) or want a 420g radio for long handheld sessions;
mainly run cars/boats/engineering vehicles — 8 custom mixes and track mixing are plenty;
plan to upgrade the gimbals to Hall bases yourself later.
✅ Verdict: Both are extremely feature-dense ANT radios for their prices. If your budget allows, go straight for the FS-ST16 — 16 channels, the full flap system, the color screen and EdgeTX flashability mean it won't be your bottleneck for the next 3–5 years. For pure entry-level or instructor duty, the FS-ST8 is the smarter spend.
FS-ST8 standard package: transmitter + FS-SR8 receiver + upgrade parts — available at SoarSky
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Editorial Hands-On Notes & Community Feedback
The following notes are compiled by the SoarSky editorial team from hands-on time with the products and public RC community discussions (RCGroups and others) — they are not buyer reviews and involve no fabricated ratings:
The ST16's screen and menus are the biggest quality-of-life upgrade. Moving from the ST8's monochrome LCD to a 3.5" color screen transforms menu density for mixes and curves, and IPS readability in bright sunlight is clearly better; the trade-off is 665g, which wants a neck strap.
The ST8's value reputation is well earned. The community widely sees it as the modern successor to the FS-i6X — roller navigation, auto-saving settings, USB-C for simulator/firmware, and programming logic that's more straightforward than budget open-source radios.
ANT is the shared weak point. RCGroups users repeatedly note that ANT is incompatible with both AFHDS 2A and 3, the receiver ecosystem is closed, and no third-party ANT module exists — inventory your receivers before upgrading.
EdgeTX flashing still has caveats. The official switching tool is smooth, but EdgeTX support is limited and the internal ANT RF doesn't work after flashing — plan on an external module. It's a path for tinkerers.
Watch range over water / low-altitude profiles. Some boat users report noticeably reduced ST8 range at low antenna heights over water; fixed-wing flying in the air is unaffected, but keep antenna orientation sensible for low, far flights.
💡 Common ground: Build quality, the 4096-step gimbal feel and feature density earn consistent praise for both radios; every recurring concern traces back to the closed ANT ecosystem and the ST16's RF limitation under EdgeTX — sort out your receiver and module plan first, then buy with confidence.
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FAQ About the FS-ST16 and FS-ST8
Is the FS-ST16 screen a touchscreen?
No. The FS-ST16 has a 3.5" 320×480 full-dot-matrix color IPS display that the official specifications explicitly list as non-touch; all navigation is done with the roller, MENU/EXIT keys and physical buttons.
What protocol do the FS-ST16 and FS-ST8 use?
Both run the ANT automatic frequency-hopping system natively, which is incompatible with AFHDS 2A and AFHDS 3; adding the FRM303 external module enables AFHDS 3 receivers, and PPM/S.BUS/CRSF modules are also supported.
Can the FS-ST16 be flashed to EdgeTX?
Yes. Flysky's official Open Source Assistant (firmwareswitcher.flyskytech.com/en) can switch between the stock OS and EdgeTX in both directions; EdgeTX has listed the ST16 as limited support since v2.11 — the internal ANT RF is unusable after flashing, so an external module is required.
Are FS-ST16 and FS-ST8 receivers interchangeable?
Yes. Both belong to the ANT ecosystem — the bundled FS-SR8/SR8A receivers, the FS-CEV04 i-BUS expansion receiver and the six i-BUS sensors are fully interchangeable; neither works directly with AFHDS 2A/3 receivers.
Should a fixed-wing beginner choose the FS-ST8 or FS-ST16?
For 4–6 channel trainers and coach planes, the FS-ST8 at $69.99 is enough and supports wireless trainer; if your model has flaps or retracts, or you plan to grow into advanced setups, go straight for the 16-channel FS-ST16 with its full flap mixing.
What is the control range of each transmitter?
The FS-ST8 is officially rated beyond 1000m (open air, interference-free). The FS-ST16 manual doesn't state a figure; third-party retail specifications list ≥1500m, and its external folding antenna can be angled to optimize the link.
Can the FS-ST8 charge its batteries?
No. The FS-ST8 specification table explicitly lists no charging port — AA cells need an external charger and a 2S LiPo must be removed to charge. The FS-ST16 charges directly via its Type-C port, cutting long-term battery costs.
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Where to Buy the FS-ST16 and FS-ST8
Both transmitters are in stock at the SoarSky official store, each including a bundled receiver:
Flysky FS-ST16 2.4GHz 16CH EdgeTX Radio Transmitter w/ 3.5" IPS Display & FS-SR8 Receiver
16-channel color-screen flagship, EdgeTX-flashable — the buy-once choice for fixed-wing & multi-model pilots
$199.00
Buy Now
Flysky FS-ST8 2.4GHz 10CH ANT Transmitter
8–12 channel lightweight workhorse — 420g, wireless trainer, unbeatable entry value
$69.99
Buy Now
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More Reading from SoarSky
Flysky AFHDS3 Receiver Buying Guide 2026 Decode the AFHDS3 receiver family and transmitter pairings so you never buy the wrong protocol.
Highlights of Flysky's New PA01 FPV Radio Meet Flysky's other open-source-leaning radio and its key selling points.
FRM303 High-Power Module Installation Guide Step-by-step FRM303 module install to unlock AFHDS3 and long range.
How Much Space Do You Need to Fly an RC Plane? Estimate a safe flying field by airframe size — a must-read before your maiden.
About SoarSky — A team of RC model and drone enthusiasts dedicated to providing premium transmitter accessories, FPV components, and RC hobby gear. We test every product hands-on and share honest, technical content to help the RC community make better decisions. Learn more at soarskyrc.com/pages/soarsky-about-us | Contact Support
Copyright: This article is original content by SoarSky. Unauthorized reproduction is prohibited. | Disclosure: This is an independent review. No sponsorship was received. All opinions are based on hands-on experience and objective spec analysis. | Last Updated: September 2026
Tags: Flysky, FS-ST16, FS-ST8, RC transmitter, radio comparison, fixed wing, ANT protocol, EdgeTX, RC receiver, RC airplane
FPV Drone Motor – A Driving Force!
The selection of an electric FPV Drone Motor has a significant impact on the flight characteristics of the multicopter. Minor differences in the construction of a motor can lead to substantial effects on the weight, responsiveness, and overall power of the multicopter.
Electromagnetism
The fundamental principle underlying the operation of both brushed and brushless DC motors is that of electromagnetism. Both motor designs inherently utilize an electromagnet as a mechanism for converting electrical energy into mechanical energy. Upon the electrical excitation of an electromagnet, a magnetic field is generated. This transient magnetic field engages with the magnetic fields of the permanent magnets situated within the motor. The interplay of attraction and repulsion between the electromagnet and the permanent magnets results in the rotational movement of the motor shaft.
Brushless and Brushed, What’s the Difference?
The principle behind brushless and brushed motors is very similar. When an electric current is passed through the windings of the motor, magnets distributed within the motor are attracted or repelled. The repetitive repulsion and attraction of the magnets translates into a revolution of the shaft. This allows the motor to spin an attached propeller at extremely high speeds, in turn, producing thrust.
Brushed FPV Drone Motor
The operational principle of a brushed motor is diametrically opposed to that of a brushless FPV drone motor. In the context of a brushed motor, the stator generates a permanent magnetic field that envelops the rotor. The rotor, which functions as an electromagnet, is subject to the influence of the surrounding stator. A pair of brushes, connected to a DC power source, make contact with the commutator ring situated at the base of the rotor. The commutator ring, being segmented, facilitates the periodic reversal of the current flowing through the rotor as it rotates, due to the commutator's alternating polarity. The oscillation of the commutator ring's polarity ensures a continuous rotation of the rotor.
This entire mechanism is housed within a motor casing, which offers superior protection for the sensitive internal components. However, the efficiency of the system is somewhat diminished due to the increased thermal insulation of the internal mechanics. It is feasible to reverse the rotational direction of the motor by inverting the polarity of the DC power supply. Owing to the brushes' contact with the commutator, the lifespan of a brushed motor is significantly shorter when compared to that of a brushless motor. In terms of application, a brushed motor is more aptly suited for micro class multicopters, where its diminutive size, light weight, and straightforward driving mechanism enhance its suitability for micro FPV flight operations.
Brushless FPV Drone Motor
True to its name, a brushless FPV drone motor is devoid of brushes. The brushless motor can be logically partitioned into two distinct components; the rotor and the stator. The stator serves as the central unit into which the rotor is affixed. The stator comprises a network of radial electromagnets that sequentially activate and deactivate to generate a transient magnetic field when an electric current is applied to the windings. The rotor houses a series of permanent magnets that are positioned in close proximity to the semi-permanent stator electromagnets. The attractive and repulsive forces between the stator and rotor magnets are converted into rotational energy. Upon assembly, the rotor shaft is inserted into a pair of ball bearings located within the stator, ensuring a linear and smooth rotation of the rotor.
Although the brushless motor is energized by direct current, it cannot be operated directly. Instead, the brushless motor is connected to control electronics, effectively obviating the necessity for brushes or a commutator. The longevity of the brushless motor is exceptional due to the absence of physical contact between the rotor and the stator. Additionally, the brushless motor exhibits greater efficiency when compared to the brushed motor. The brushless motor is widely utilized in mini and select micro multicopter applications, where emphasis is placed on high power output and efficiency.
Motor Sizing and Identification
The dimensions of a brushless motor are denoted by a four-digit code that specifies the stator's measurements in millimeters, for instance: 2206. The initial two digits in the sequence denote the diameter of the stator, in this instance, 22mm. The subsequent two digits represent the height of the stator, with "06" indicating that the stator unit measures 6mm in height. It is imperative to note that these figures do not describe the external dimensions of the brushless motor itself.
The size of a brushed motor can be identified through a simpler two number system that clearly defines the diameter and height of the exterior can in millimetres. Example: 6×15, the first number “6” is a measurement of the cans diameter and “15” the height of the can.
Mounting Patterns and Thread Size
Mounting patterns and thread sizing is dependent on the type of motor and its application. The mounting pattern defines the positioning of the threaded bolt holes on the base of the motor. Each number describes the diameter of a circle with its centre placed in the middle of the motor shaft. Usually, four holes are placed along the circumference of the circle, if two numbers are given, two holes are placed on each circle. For example, a 2205 with 16×19 spacing will have four M3 size threaded holes distributed evenly on both the circumference of the 16mm circle and 19mm circle. The dimensions of the threaded shaft are given by an ISO screw thread rating, which describes the outer diameter of the shaft.
220X – 240X
Most often a 16x19mm mounting pattern is used, however, 16×16 is becoming increasingly common. The threaded holes are M3. The threaded shaft diameter is usually M5.
180X
Usually a 16×12 mounting pattern, threaded holes are M2 and M5 threaded shaft diameter is typical.
130X – 140X
Commonly 12×12, the threaded holes are M2 and a M5 threaded shaft is typical.
110X
Often 9×9, threaded holes are typically measured as M2. The shaft is not threaded and usually measures 1.5mm in diameter. Motors in this size class also have an additional set of holes on the top of the motor bell. The hole spacing is 5mm and each hole is 2mm in diameter. The purpose of these holes is for secure mounting of the propeller, as a lock nut is absent.
Why doesn’t the Bell fly off?
As discussed earlier, the rotor of a brushless FPV drone motor is compiled of a circular array of magnets and a central shaft. When the motor is assembled, the shaft protrudes from the base of the motor. Here it is either secured by a circlip or tightly bolted in place. Circlips are most commonly used, however, bolts are becoming increasingly popular. Although the circlip has been the primary choice, maintenance can be frustrating due to the difficulty of removal. The circlip is fragile and minuscule in size, causing it to be easily broken or lost.
The Velocity Constant — How fast a Motor Spins
kV=RPM per 1 Volt
k = The kV rating of the motor e.g. 2300
V = Voltage input e.g. 16.8v
Example: 2300(kV rating) X 16.8(Voltage) = 38,640(Revolutions Per Minute)
The velocity constant (kV) determines how many rotations a motor can make within a minute without a load (no propeller) and at a constant current of 1 Volt. Simply, kV is a representation of how fast the motor can potentially spin. The kV of a motor is defined by the strength of the magnetic field at the stator and the amount of turns in the windings. A motor with a lower kV is best suited for efficiently driving heavy propellers. A high kV motor is optimized for lightweight propellers.
Thrust
Thrust is one of the key factors to consider when choosing a motor. The thrust output of a motor is usually measured in grams and varies depending on how fast the motor is spinning and the propeller that it is rotating. Before a multicopter can begin to accelerate, a certain amount of thrust is required to overcome drag, as well as the pull of gravity.
Weight and FPV Drone Motor Momentum
When selecting a motor, it’s not all about thrust numbers. The weight of the motor should also be considered, as it has a significant impact on the flight characteristics of the multicopter. Due to the moment of inertia, a heavier motor will be more resistant to changes in acceleration than a lighter motor. The primary issue with a heavy multicopter motor being resistant of acceleration is that it will provide inaccurate flight characteristics and poor responsiveness once in the air. If maneuverability is a priority, a lightweight motor is an exemplary choice. On the other hand, an application in which maximum all-out speed is a must; larger motors will be able to provide the higher thrust numbers that are required.
FPV Drone Motor Response Time
Torque is a measurement of how quickly a motor can reach a certain RPM, directly affecting the responsiveness of a motor. Torque allows a multicopter to briskly maneuver through flips and rolls, additionally improving the accuracy of these movements. The amount of torque a motor can output also influences propeller selection. Heavier props will require more torque to accelerate than lighter props. The best gauge for motor torque is the dimensions of the stator. Larger stators tend to be capable of producing greater torque. Although, a larger stator will increase the total weight of the motor.
FPV Drone Motor Efficiency
Motor efficiency is a balancing act, requiring an equilibrium to be struck between the electrical power entering the motor and the mechanical power being produced by the motor as it spins. The importance of motor efficiency varies based on the situation. If high speed is prioritized, short flight times are often seen to be acceptable; FPV quadcopter races may only last for two minutes! In the contrary, long-range FPV multicopters require maximum efficiency to achieve longer flight times, increasing the distance that can be travelled.
Conclusion
Motors are arguably the most influential piece of equipment on a multicopter, having a considerable impact on flight characteristics relative to other components. It is essential that motors are carefully selected with adequate appropriateness for their application.
FS-ZCZ-STW01 assembly seat is a potentiometer steering wheel assembly seat. This assembly seat simulates the control angle of a real car steering wheel and can provide a simulated driving experience. This assembly seat is compatible with transmitters such as FS-ST8 and FS-i6S. This article mainly introduces how to use FS-ZCZ-STW01 with FS-I6S/FS-ST8.
Adaptation and compatibility reference table
TX
Install on the left joystick
Install on the right joystick
Does the transmitter support joystick calibration
Steps
FS-ST8
No need to adjust the joystick line sequence
Need to adjust the joystick line sequence
Supported
Need to flash the potentiometer version firmware
FS-I4
/
/
/
ODM/OEM
FS-I4X
/
/
/
ODM/OEM
FS-I6
/
/
/
ODM/OEM
FS-I6X
Need to adjust the joystick line sequence
No need to adjust the joystick line sequence
Not supported
Need to adjust the joystick line sequence
FS-I6S
Need to adjust the joystick line sequence
No need to adjust the joystick line sequence
Supported
Need to adjust the joystick line sequence
FS-ST8 potentiometer version firmware:https://www.flysky-cn.com/st8-downloads
Installation video reference link:https://www.youtube.com/watch?v=SLNPjMSDlDwLearn More
FS-ST8 line sequence adjustment diagram
FS-I6S line sequence adjustment diagram
Calibration steps:
Before calibration, make sure the transmitter has entered the joystick calibration mode (the method can be found in the transmitter manual)
1. Enter the calibration mode:
Use a slender tool to press the self-reset button calibration hole for 3 seconds, and the turn signals on both sides are always on.
2. Center calibration:
Short press the self-reset button once, the turn signal flashes once, and the center calibration is completed.
3. Minimum/maximum calibration:
Short press twice → the turn signal flashes twice (minimum calibration); short press 3 times → the turn signal flashes 3 times (maximum calibration)
4. Exit calibration:
Press the calibration hole for 3 seconds, and the turn signal is completely off.
5. Steering wheel calibration:
Release after turning left and right, and the steering wheel will complete the minimum and maximum calibration.
Note: If the calibration fails, repeat the above steps; FS-I6, FS-I4 and other models need to be used with the factory, and do not support user calibration.
Frequently Asked Questions
1. Which models are compatible?
A: Car, ship models, etc.
2. How many turns can the steering wheel make?
A: 1.5 turns 540° on each side (total 1080°), simulating the feel of a real car
3. Is the connection cable standard?
A: Users need to prepare or DIY, and it is recommended to use a 1.5mm terminal cable (length: 10cm)
4. Will the battery life be affected after installation?
A: Low power design, with FS-ST8 using Nanfu batteries, the battery life is ≥20 hours
5. Can the resistance of the steering wheel assist device be adjusted?
A: Manual adjustment is not supported; its preset resistance has optimized the one-handed operation experience. If greater resistance is required, you can try to install an anti-slip pad
6. Can it be adapted to non-Fushi brand potentiometer transmitters?
A: If the installation holes of the transmitter assembly seat are consistent, you can physically install and use the basic steering function, but the calibration function and turn signal prompt may not be compatible
7. Does it support firmware upgrades?
A: No
Learn More
Dive into the HOTA D6 Pro, a dual-channel 650W smart charger designed specifically for RC model enthusiasts. This comprehensive review covers its appearance, functionality, and performance to provide you with a thorough buying reference.
The FMS EDF Jet 90mm Super Scorpion V2 PNP, with its twin-tail design and exceptional performance, is acclaimed as the "Twin-Tail Performance Beast.". Today, we will delve into the unique allure of this aircraft.
Aesthetic Design: The Super Scorpion V2 boasts a brand-new paint scheme, offering a camouflage(CAMO ) and a bright orange option. I opted for the bright orange, which, along with its high visibility and the solid, smooth finish of the aircraft's paintwork, makes the foam material's graininess nearly imperceptible. The leading edges and rudder surfaces are adorned with a silver paint for added texture.
Hardware Configuration: Equipped with three CNC aluminum alloy landing gears, the front landing gear offers a moderate shock absorption, while the main landing gear is slightly stiffer, yet the large wheel size is well-suited for takeoffs and landings on unpaved runways.
Flight Performance: The Super Scorpion V2 excels in high-speed aerobatic maneuvers with extremely high stability and precision in stunt execution. Despite the larger wing area, the corresponding increase in aircraft weight requires pilots to manage energy carefully during low-speed, high-bank turns to avoid the risk of spinning out. With proper energy management, you can perform graceful low-speed spiral maneuvers.
Assembly and Tuning: As a PNP (Plug-N-Play) configured aircraft, it comes with a 6S power system and an optional 8S power setup, catering to those who seek extreme flight capabilities. All electronic devices are pre-installed, though users will need to adjust the control surfaces for neutral settings. The assembly and tuning process takes approximately 45 minutes, and the entire aircraft is constructed without the need for glue.
Conclusion: The FMS EDF Jet 90mm Super Scorpion V2 PNP is an aeromodel aircraft that combines powerful thrust, high-speed aerobatic performance, and exquisite aesthetics. It's not only suitable for experienced pilots but also offers challenges and enjoyment for beginners.Learn More
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ERUN XR14: Take your 1/14 scale racing to the next level!
Introduction: In the world of remote control racing, performance and speed are key. The Hobbywing XeRUN RX14 ESC has become the preferred choice for racers and professionals alike with its superior performance and reliability. This article will take you through the revolutionary features of this electronic speed controller and how it enhances your racing experience.
Core Features of the Hobbywing XeRUN RX14 ESC:
Ultra-Speed Performance:
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With a continuous current output capability of up to 14A, the XeRUN RX14 ESC can easily handle various high-speed racing challenges. Its efficient current management ensures stability and responsiveness when your racing vehicle is at top speeds.
Intelligent Control:
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Equipped with advanced control algorithms, the XeRUN RX14 ESC adjusts output based on real-time vehicle status, providing unparalleled control precision.
Durability and Reliability:
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Focused on durability in design, the XeRUN RX14 ESC maintains stable operation in various harsh environments, serving as a strong backbone for your racing vehicle.
User-Friendly Programming:
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With a simple programming interface, users can easily adjust ESC settings to suit different racing vehicles and driving styles.
Why Choose the Hobbywing XeRUN RX14 ESC?
Performance and Control: The XeRUN RX14 ESC ensures consistent performance on the track with its ultra-speed performance and intelligent control.
Durability: Whether it's a muddy off-road track or a smooth asphalt surface, the XeRUN RX14 ESC provides reliable power output.
Ease of Use: The user-friendly programming interface allows beginners and professionals alike to easily customize ESC settings.
Conclusion:
The Hobbywing XeRUN RX14 ESC is the ideal choice for remote control racing enthusiasts, offering unparalleled racing experiences with its ultra-speed performance, intelligent control, and durability. Choose the XeRUN RX14 ESC to make your racing vehicle stand out on the track.
Call to Action:
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Visit our website now to learn more about the Hobbywing XeRUN RX14 ESC and purchase this high-performance electronic speed controller to elevate your racing experience to new heights.
Get XR14: https://soarskyrc.com/search?q=XR14&options%5Bprefix%5D=last
A comparison of four Flysky AFHDS3 receivers—the FGr4D, FGr4B, FGr4S, and FGr4P—covering specifications, antennas, water resistance, input voltage, and optimal applications for RC cars and boats. Available from SoarSky starting at $28.99.
