Seagull Models Ultimate Biplane 54" 20cc ARF
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Seagull Models Ultimate Biplane 54" 20cc ARF
Bring precise aerobatics and 3D performance to your flight line with the Seagull Models Ultimate Biplane. Lightweight laser-cut balsa-and-plywood construction, carbon-fiber tubes and upgraded hardware create a sturdy airframe with a distinctive high-visibility covering scheme. Plug-in upper and lower wings with pinned inter-plane struts simplify transport and storage, while the magnetic canopy hatch provides convenient access. Choose 20cc gas power or build electric with the included conversion kit.
✈️ Classic Biplane Presence, Modern Aerobatic Performance
The Ultimate's stacked-wing silhouette brings unmistakable aerobatic character to the flight line, with a model designed for both precision maneuvers and 3D flying.
Visibility note: Incoming models will have an orange stripe on the leading edge of both wings for better visibility on clear days.
Key Features
- Lightweight laser-cut balsa-and-plywood construction with carbon-fiber tubes.
- Plug-in upper and lower wings with pinned inter-plane struts.
- Factory-applied covering with a high-visibility color scheme.
- Precise aerobatic and 3D performance capability.
- Custom G10 control horns for optimized throw and precision.
- Ball-link connections for secure linkages.
- Factory-painted fiberglass engine cowl and wheel pants.
- Magnetic canopy hatch.
- Hardware pack and electric conversion kit included.
- For intermediate and advanced pilots.
Technical Specifications
| Model / SKU | Ultimate Biplane / SEA389 |
| Wingspan | 54.3" (138 cm) |
| Length | 59.4" (151 cm) |
| Wing Area | 992 sq. in. (64 sq. dm) |
| Flying Weight | 9.2–10.6 lb (4.2–4.8 kg) |
| Gas / Glow Power | 20cc gas or .91–1.25 cu. in. 2- or 4-stroke glow engine |
| Recommended Electric Motor | Dualsky XM5060EA-10 V3 |
| Recommended ESC / Battery | Dualsky Summit 100 Light / Power Unlimited 4800mAh 6S LiPo |
| Recommended Electric Propeller | Falcon 16×10 wood electric propeller |
| Radio / Servos | 6-channel system. Gas: 6 total — 2× Elevator | 2× Aileron | 1× Rudder | 1× Throttle. Electric: 5 total — 2× Elevator | 2× Aileron | 1× Rudder. No throttle servo required. Recommended: KingMax CLS4411HHV with Servo Mounting Insert Tray. |
| Spinner Required | 2.75" (70 mm) |
| Covering Colors | Oracover Fluorescent Blue 21-051, Silver 21-091 and Blue Corsair 21-019; incoming models add orange leading-edge stripes. |
| Pilot Skill | Intermediate/Advanced |
What's In The Box
- Factory-covered Ultimate Biplane ARF airframe.
- Plug-in upper and lower wings and pinned inter-plane struts.
- Factory-painted fiberglass engine cowl and wheel pants.
- G10 control horns, ball-link hardware and hardware pack.
- Electric conversion kit.
⚠️ Engine or motor, ESC, batteries, servos, radio equipment, propeller, spinner and other completion equipment sold separately.
⛽ Complete Your Build — Gas Setup
| Engine | Recommended: Stinger 20cc Side-Exhaust Gas Engine |
| Servos | 6 total: 2× Elevator | 2× Aileron | 1× Rudder | 1× Throttle Recommended: KingMax CLS4411HHV with Servo Mounting Insert Tray. |
⚠️ Engine, servos, batteries and radio equipment sold separately.
⚡ Complete Your Build — Electric Setup
| Motor | Dualsky XM5060EA-10 V3 Brushless Outrunner Motor |
| ESC | Dualsky Summit 100 Light Brushless Speed Controller |
| Battery | Power Unlimited 4800mAh 6S LiPo Battery |
| Propeller | Falcon 16×10 Wood Electric Propeller |
| Servos | 5 total: 2× Elevator | 2× Aileron | 1× Rudder No throttle servo required for electric power. Recommended: KingMax CLS4411HHV with Servo Mounting Insert Tray. |
⚠️ Motor, ESC, batteries, propeller, servos and radio equipment sold separately.
Aerobatic Context
The Ultimate biplane's distinctive stacked-wing form reflects the visual character of aerobatic biplanes. This model focuses on precision aerobatics and 3D performance, combining a lightweight all-wood airframe with modern control hardware and gas or electric power options.
The Gator-RC Advantage
As a premier Seagull Models distributor, Gator RC brings you a wide selection of Seagull aircraft, quality build accessories, and knowledgeable support to help you complete your next model.
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