Flysky PL18 Ultra vs PL18: What's New & Should You Upgrade?

Last Updated: July 2026 | Reading Time: 12 minutes | Difficulty: Intermediate | Author: Dannyi Chen

Dannyi Chen — RC Enthusiast & Technical Writer at SoarSky. Over 12 years of RC flying and building experience, specializing in transmitter systems and aircraft setup.

I. Who Is SoarSky and Why Trust This Guide?

SoarSky is a team of RC model and drone enthusiasts including structural engineers and hardware engineers. We're passionate about researching RC models and sharing knowledge with the community. Every product recommendation in our guides is based on hands-on testing and real-world experience.

This comparison was written by Dannyi Chen, a SoarSky core member with over 12 years of RC flying and building experience, specializing in transmitter systems and radio setup.

II. What Are the 4 Biggest Upgrades in the PL18 Ultra?

Flysky's PL18 Ultra takes everything that made the original PL18 great and adds four headline upgrades:

1. EdgeTX Open-Source System — Run both Flysky's native OS and EdgeTX on the same hardware, giving you access to Lua scripting, Companion PC software, and the massive EdgeTX community ecosystem.
2. 500mW Max RF Power with Direct External Module Mounting — The Ultra outputs up to 500mW even on its internal RF, and external RF module adapters (FGPZ01/FGPZ02) mount directly without disassembling the rear case.
3. 3.5" High-Brightness Outdoor Screen (657 LUX) — The Ultra's screen reaches 657 LUX brightness, making it clearly readable in direct sunlight.
4. Adjustable Throttle Travel — The new gimbal assembly allows adjusting the vertical (throttle) travel for rapid throttle inputs, ideal for FPV drones and fast-paced models.

Beyond these four, the Ultra also introduces dedicated DLG glider support with optional hardware modifications, making it the most versatile Flysky transmitter ever built.

III. PL18 Ultra vs PL18: Full Specs Comparison

IV. What Does EdgeTX Support Mean for Pilots?

The PL18 Ultra's most groundbreaking feature is its ability to run EdgeTX — one of the most powerful open-source RC transmitter firmware projects in the world.

EdgeTX Key Benefits

• Lua scripting — Create custom telemetry dashboards, flight mode selectors, and automated functions
• Companion PC software — Program all your models on your computer with full simulator support
• Massive community — Thousands of shared model configurations, scripts, and tutorials
• Custom voice packs & wallpapers — Load personalized audio alerts and background images via the microSD card (EdgeTX only)

Important: The PL18 Ultra supports EdgeTX only — not OpenTX. EdgeTX is the active fork of the OpenTX project with continued development and modern features.

Switching Between Systems

The Ultra allows you to boot between Flysky OS and EdgeTX. Fly AFHDS 3 models with Flysky's deep telemetry integration today, switch to EdgeTX for your FPV quad with Lua scripts tomorrow — all on the same radio.

V. How Does the RF System Differ Between PL18 and Ultra?

PL18: FRM301 External Module (100mW Max)

On the original PL18, using an external RF module requires removing the rear FRM301 module. The FRM301 operates at a maximum of 100mW transmit power.

PL18 Ultra: Direct Mount, No Disassembly (500mW Max)

External RF module adapters mount directly to the Ultra's rear panel — no disassembly required. Even using its internal RF, the PL18 Ultra can output up to 500mW — five times the power of the PL18's FRM301.

VI. How Bright Is the PL18 Ultra's 657 LUX Outdoor Screen?

The PL18 Ultra features a 3.5-inch high-brightness outdoor color screen reaching 657 LUX — among the brightest in the RC transmitter category. This provides crystal-clear readability in bright outdoor conditions, easy menu navigation at the field, and confident telemetry monitoring on sunny days.

VII. What Does Adjustable Throttle Travel Do?

The PL18 Ultra's adjustable gimbal assembly lets you change the physical up-and-down travel distance of the throttle stick — ideal for FPV drone pilots who want shorter, snappier throttle throws and racing pilots who prefer maximum rate response with minimal stick movement.

VIII. How Does PL18 Ultra Support DLG Glider Flying?

The PL18 Ultra introduces dedicated DLG (Discus Launch Glider) support with crow mixing, flaperon and camber mixing, launch mode, and flight phase timers. Optional hardware accessories from SoarSky further enhance the glider experience:

IX. What Are the Battery Differences?

The PL18 uses an internal 1S lithium-ion battery (not user-replaceable). The Ultra upgrades to a removable 8700mAh high-capacity battery — hot-swappable for all-day flying and user-replaceable when it eventually degrades.

X. microSD Card: Why Does It Matter?

The PL18 has fixed internal storage with no expansion. The Ultra's microSD card slot enables custom voice packs, custom wallpapers, ample model storage, and easy PC backup — all primarily for EdgeTX users.

XI. Should You Upgrade from PL18 to PL18 Ultra?

Upgrade to PL18 Ultra If:

• You want to run EdgeTX with Lua scripting and Companion software
• You need 500mW RF power for maximum range
• You fly outdoors and need the 657 LUX screen
• You fly DLG gliders and want dedicated glider mode
• You want adjustable throttle travel or a removable 8700mAh battery

Stick with the Original PL18 If:

• You're happy with Flysky OS and don't need EdgeTX
• Your 100mW FRM301 range is sufficient
• You're budget-conscious — the PL18 offers excellent value

XII. Frequently Asked Questions

Q: Does the PL18 Ultra support OpenTX?

A: No. The PL18 Ultra supports EdgeTX only — not OpenTX. EdgeTX is the actively developed fork of the OpenTX project with continued updates and modern features.

Q: Can I use custom voice alerts on both PL18 and PL18 Ultra?

A: Neither the PL18 nor the PL18 Ultra (in Flysky OS mode) supports custom voice alerts. Custom voice packs only work on the PL18 Ultra when running EdgeTX, and they require the microSD card slot.

Q: How do I use the coach/trainer function?

A: Both the PL18 and PL18 Ultra support coach/trainer functionality via the audio port (wired) or Bluetooth (wireless). Pair two compatible Flysky transmitters and the student can fly while the instructor holds an override switch.

Q: Can I adjust the aileron travel on the PL18 Ultra?

A: No. The PL18 Ultra's adjustable gimbal assembly only affects vertical (throttle) travel. Horizontal (aileron/roll) travel is fixed. Use digital endpoint and curve settings to adjust aileron response.

Q: Do I need the glider hardware mods to fly DLG?

A: No — the DLG glider mode is built into the PL18 Ultra's firmware and works out of the box. The optional self-centering back wheel knobs and custom toggle switches simply enhance the experience for serious glider pilots.

Q: Is the PL18 Ultra compatible with all my existing AFHDS 3 receivers?

A: Yes. All AFHDS 3 receivers (FTr12B, FTr8B, Tr8B, TMr, INr6-HS, FTr10, FTr16S) work identically with both the PL18 and PL18 Ultra.

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.

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: July 2026