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Flysky PL18 Ultra vs PL18: What's New & Should You Upgrade? Last Updated: June 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. ⚡ Quick Answer The PL18 Ultra upgrades the original PL18 with four headline features: (1) EdgeTX open-source system support — run both Flysky OS and EdgeTX on one radio; (2) 500mW max RF power with direct external RF module adapter mounting (no disassembly required); (3) 3.5" high-brightness outdoor screen at 657 LUX for crystal-clear visibility in direct sunlight; and (4) adjustable throttle travel for rapid throttle response on drones and fast-paced models. The Ultra also introduces dedicated DLG glider support with optional self-centering back wheel knobs and custom toggle switches. If you want EdgeTX flexibility, 500mW power, or fly gliders, the Ultra is worth the upgrade. If you're happy with Flysky OS and 100mW FRM301, the original PL18 remains a solid choice. Table of Contents I. Who Is SoarSky and Why Trust This Guide? II. What Are the 4 Biggest Upgrades in the PL18 Ultra? III. PL18 Ultra vs PL18: Full Specs Comparison IV. What Does EdgeTX Support Mean for Pilots? V. How Does the RF System Differ Between PL18 and Ultra? VI. How Bright Is the PL18 Ultra's 657 LUX Outdoor Screen? VII. What Does Adjustable Throttle Travel Do? VIII. How Does PL18 Ultra Support DLG Glider Flying? IX. What Are the Battery Differences? X. microSD Card: Why Does It Matter? XI. Should You Upgrade from PL18 to PL18 Ultra? XII. Frequently Asked Questions 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: 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. 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. 3.5" High-Brightness Outdoor Screen (657 LUX) — The Ultra's screen reaches 657 LUX brightness, making it clearly readable in direct sunlight — a major upgrade for outdoor flying. 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 Specification ✦ PL18 Ultra PL18 Operating System Flysky OS + EdgeTX Flysky OS only Max RF Power 500mW (internal RF) 100mW (via FRM301) External RF Setup Direct adapter mount (FGPZ01/02), no disassembly Remove rear FRM301 module first Screen 3.5" 657 LUX high-bright outdoor color screen 3.5" color touchscreen Throttle Travel Adjustable vertical travel (up/down only) Fixed travel Glider Support DLG glider mode + optional hardware mods Not available Battery Removable 8700mAh battery Built-in 1S Li-ion microSD Slot Yes (expandable, swappable) No (fixed internal memory) Coach/Trainer Audio port + Bluetooth wireless Audio port + Bluetooth wireless Dimensions 212.5 x 86.7 x 191 mm 214 x 86.5 x 192 mm Weight 1005g 946g Channels 18 channels 18 channels Wireless Charging Qi wireless Qi wireless Protocol AFHDS 3 bidirectional telemetry AFHDS 3 bidirectional telemetry 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) 💡 Note: Custom voice packs and wallpapers require the microSD card slot (Ultra only) and only work when running the EdgeTX system. In Flysky OS mode, these customization features are not available. Important: The PL18 Ultra supports EdgeTX only — not OpenTX. While EdgeTX is the active fork of the OpenTX project with continued development and modern features, OpenTX itself is not installed on the Ultra. 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? This is where the PL18 Ultra pulls decisively ahead for pilots who demand maximum range and flexibility. PL18: FRM301 External Module (100mW Max) On the original PL18, using an external RF module requires removing the rear FRM301 module from the back of the transmitter. You then install an external module adapter (such as FGPZ01 or FGPZ02) in its place. The FRM301 module itself operates at a maximum of 100mW transmit power. PL18 Ultra: Direct Mount, No Disassembly (500mW Max) The PL18 Ultra completely redesigns the external RF approach. External RF module adapters mount directly to the Ultra's rear panel — no need to disassemble or remove any internal components. The Ultra does not have a traditional nano module bay; instead, the adapter system is purpose-built for clean, tool-free installation. More importantly, even when using its internal RF, the PL18 Ultra can output up to 500mW — five times the power of the PL18's FRM301. This directly translates to significantly longer control range and better signal penetration. ✅ Bottom Line: If you need maximum range or plan to use external protocols like ELRS or Crossfire, the Ultra's 500mW internal power and direct-mount adapter system are major advantages over the PL18's 100mW FRM301 setup. VI. How Bright Is the PL18 Ultra's 657 LUX Outdoor Screen? One of the most noticeable upgrades on the PL18 Ultra is its 3.5-inch high-brightness outdoor color screen, reaching an impressive 657 LUX. What does 657 LUX mean in practice? Direct sunlight typically ranges from 32,000 to 100,000 LUX. While no screen can match the sun, 657 LUX is among the brightest in the RC transmitter category and provides: Crystal-clear readability in bright outdoor conditions — no more cupping your hand over the screen Easy menu navigation at the field without squinting or finding shade Confident telemetry monitoring even on sunny days at the flying field Both the PL18 and PL18 Ultra share the same 3.5" touchscreen size, but the Ultra's significantly higher brightness rating makes a real difference for outdoor pilots. VII. What Does Adjustable Throttle Travel Do? The PL18 Ultra introduces an adjustable gimbal assembly — but with an important clarification: this adjustment applies to vertical (throttle) travel only, not horizontal (aileron/roll) travel. What Can You Adjust? The adjustable assembly lets you change the physical up-and-down travel distance of the throttle stick. This is particularly valuable for: FPV drone pilots who want shorter, snappier throttle throws for rapid punch-outs and precise altitude control Racing pilots who prefer maximum rate response with minimal stick movement Fast-paced models where quick throttle changes are critical ⚠️ Important: The PL18 Ultra's adjustable travel only affects the vertical (throttle) axis. The horizontal (aileron/roll) travel is not adjustable. If you need to adjust aileron response, use your transmitter's digital endpoint and curve settings instead. VIII. How Does PL18 Ultra Support DLG Glider Flying? The PL18 Ultra introduces dedicated DLG (Discus Launch Glider) support — a first for the Flysky PL series. This makes the Ultra an exceptional choice for glider enthusiasts who need specialized controls for thermal soaring and precision flight. DLG Mode Features The PL18 Ultra's firmware includes a dedicated glider flight mode with: Crow (butterfly) mixing for controlled descents and landing approaches Flaperon and camber mixing for optimizing lift in different thermal conditions Launch mode with preset elevator compensation for discus launches Flight phase timers for tracking thermal duration and motor run time Optional Glider Hardware Mods To fully optimize the PL18 Ultra for glider flying, Flysky offers two key hardware accessories: 1. Dual Self-Centering Back Wheel Knobs Replace the standard rear pots with self-centering back wheel knobs that spring back to neutral — ideal for controlling flaps, spoilers, or camera gimbals where you want automatic return-to-center behavior. Buy Dual Self-Centering Back Wheel Knobs at SoarSky — $23.99 2. F & H Switch Set (3-Position + Self-Return) Upgrade the F and H switches to a 3-position toggle with 1-position self-return and 2-position normal configuration. This gives you more switch positions for flight mode selection, launch/landing modes, and auxiliary functions. Buy F & H Switch Set at SoarSky — $21.99 Combined with the INr6-HS or Tr8B receiver (both featuring built-in altimeters), the PL18 Ultra becomes a powerful glider platform for F5J competition and recreational thermal soaring. IX. What Are the Battery Differences? The PL18 and PL18 Ultra take fundamentally different approaches to power: PL18: Built-In 1S Li-Ion The original PL18 uses an internal 1S lithium-ion battery that is built into the transmitter body. While this keeps the design compact, the battery is not user-replaceable and capacity is limited. PL18 Ultra: Removable 8700mAh Battery The Ultra upgrades to a removable 8700mAh high-capacity battery. This is a game-changer for several reasons: All-day flying — 8700mAh easily covers multiple long sessions at the field Hot-swappable — Carry a spare battery and swap mid-day without downtime Long-term replacement — When the battery eventually degrades, simply buy a new one instead of replacing the entire transmitter 💡 Both models support Qi wireless charging on the same charging dock. Place either transmitter on the dock and it charges automatically — no cables needed. X. microSD Card: Why Does It Matter? The PL18 Ultra's microSD card slot is easy to overlook but unlocks significant functionality — especially for EdgeTX users. PL18: Fixed Internal Memory The original PL18 has a fixed amount of internal storage. You cannot expand it, and there's no way to add custom files like voice packs or wallpapers. PL18 Ultra: Swappable microSD Card The Ultra's microSD slot opens up several possibilities: Custom voice packs (EdgeTX only) — Load personalized audio alerts for flight modes, telemetry warnings, and timers Custom wallpapers (EdgeTX only) — Personalize your transmitter's home screen Ample storage space — Use a large-capacity card for virtually unlimited model storage and log files Easy backup and transfer — Pop the card out to back up your entire transmitter configuration to a PC 💡 Important: Custom voice packs and wallpapers only work when running the EdgeTX system. In Flysky OS mode, these customization features are not supported. The microSD card is primarily useful for EdgeTX users who want to personalize their setup. XI. Should You Upgrade from PL18 to PL18 Ultra? Here's our decision framework: 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 plan to use external RF modules (ELRS, Crossfire) with direct adapter mounting You fly outdoors and need the 657 LUX screen for sunlight readability You fly DLG gliders and want dedicated glider mode + hardware mods You want adjustable throttle travel for rapid-response flying You want a removable 8700mAh battery for all-day sessions Stick with the Original PL18 If: You're happy with Flysky OS and don't need EdgeTX Your 100mW FRM301 range is sufficient for your flying style You don't fly gliders or need specialized flight modes You're budget-conscious — the PL18 offers excellent value ✅ Bottom Line: The PL18 Ultra is the most versatile Flysky transmitter ever built. If EdgeTX, 500mW power, glider support, or the 657 LUX screen matter to you, it's worth every penny. If simplicity and value are your priorities, the original PL18 still delivers a great flying experience. Ready to Choose Your PL18? Shop both PL18 and PL18 Ultra at SoarSky with expert support and fast global shipping. Shop Flysky Transmitters at SoarSky 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 to load audio files. 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 in your transmitter software 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. More Reading from SoarSky Flysky AFHDS 3 Receiver Buying Guide 2026: 7 Popular Models Compared & Best Use CasesNot sure which receiver to pair with your PL18 Ultra? Our complete guide breaks down all 7 AFHDS 3 models. Flysky NB4+/NB4 Pro+ FRM303 High Power Module Mount Installation GuideStep-by-step installation guide for the FRM303 range extender on NB4+ transmitters. SoarSky RC Buying Guide: Motor, ESC, Servo & Battery for RC CarsComplete buying guide for RC car electronics — motors, ESCs, servos, and batteries explained. Tamiya M-08: Everything We Know About the Next RWD M-ChassisPreview and analysis of Tamiya's upcoming M-08 RWD M-chassis platform. Hobbywing XeRun V10 G5 vs V10 G4R: What's Changed?Detailed comparison of Hobbywing's latest V10 G5 brushless motor against the G4R. 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: June 2026