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Seagull Ultimate Biplane 20cc 1.37m ARTF SEA389
Brand: Seagull
Part No: SEA389
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Our recommended kit, bundled at a combined priceSeagull's recommended gear to go with your Seagull Ultimate Biplane (20cc) 1.37m (54.3in) — bundled together for your convenience.
1× Master Airscrew K Series - 15x8 PropellerMASKK15X80N01
4× Futaba S-U400 Standard Digital HV Servo PWM/S.Bus2 - 7.9kg - 0.13sFUT05102678-3
2× Futaba S-C300 Standard Digital Servo PWM/S.BUS2 9.6kg 0.12s 4.8V - 7.4VFUT05102734-3
1× SC SC108A-S 2-Stroke Glow R/C Aero EngineSCEA1082950
Seagull's recommended gear to go with your Seagull Ultimate Biplane (20cc) 1.37m (54.3in) — bundled together for your convenience.
1× Stinger Engines 26cc Single Cylinder Rear Exhaust 2-Stroke Petrol EngineRCGF26RE
1× Stinger Engines 17x8 Beech Wood PropellerRCGF17X8BWP- 4× Futaba S-U400 Standard Digital HV Servo PWM/S.Bus2 - 7.9kg - 0.13sFUT05102678-3
- 2× Futaba S-C300 Standard Digital Servo PWM/S.BUS2 9.6kg 0.12s 4.8V - 7.4VFUT05102734-3
Seagull's recommended gear to go with your Seagull Ultimate Biplane (20cc) 1.37m (54.3in) — bundled together for your convenience.
- 1× Stinger Engines 16x8 Beech Wood PropellerRCGF16X8BWP
- 4× Futaba S-U400 Standard Digital HV Servo PWM/S.Bus2 - 7.9kg - 0.13sFUT05102678-3
- 2× Futaba S-C300 Standard Digital Servo PWM/S.BUS2 9.6kg 0.12s 4.8V - 7.4VFUT05102734-3
1× SC SC120FS 4-Stroke Glow R/C Aero Engine (Rear Needle)SCEAF1201966
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Description
The Seagull Ultimate Biplane (20cc) 1.37m (54.3in), part number SEA389, is an ARTF aerobatic biplane built from balsa and plywood and aimed at intermediate to advanced pilots. It is a compact model with a 1:4.3 scale and a wingspan of around 1.37 metres.
The airframe arrives factory assembled and covered in Oracover film, with a factory-painted glass fibre engine cowl. The four-piece wing set has functional ailerons on all four wings, and the top and bottom wing panels plug together so each can be transported in one piece. Cabane and interplane struts are supplied, and the tailplane is wire braced.
The model has a dural undercarriage, a steerable tail wheel, colour-coordinated glass fibre wheel spats and a colour-matched plastic spinner. Control surfaces use ball link connectors, and a large canopy hatch gives access to the fuselage. A full hardware pack is included, along with an electric motor mount conversion kit. Suggested power is a 20 to 26cc petrol engine, or a 6S to 8S electric setup using a motor in the 2000 class with an 85 to 110A speed controller.
What's Included
- Factory-finished fuselage assembly
- Covered 4-piece wing set
- Covered tail set
- Clear canopy moulding and pilot figure
- Undercarriage and wheel set
- Hardware pack, tubular aluminium wing spar and instruction manual
Required to Complete
- 20 to 26cc petrol, glow or equivalent electric power system
- Propeller to suit the chosen engine or motor
- 6-channel transmitter and receiver
- 6 digital servos
- Protective foam for the radio system
Specifications
- Approx. flying weight: 4.8 kg
- Length: 1,510 mm
- Wingspan: 1,380 mm
- Wing area: 64 dm²
- Scale: 1:4.3
Secured by Stripe
Seagull Ultimate Biplane (20cc) 1.37m (54.3in) Manuals & Guides
Manuals & Guides
Specifications
The Ultimate Biplane SEA-389 is a compact, aggressive aerobatic aircraft designed for intermediate to advanced pilots seeking crisp control, thrilling manoeuvres, and a bold presence in the sky. With a wingspan of 1.37m (54") and traditional balsa/plywood construction, this ARTF model is strong, lightweight, and factory-covered for a clean, professional finish.
Engineered for 20–26cc petrol engines or a high-powered 6S–8S electric setup, the Ultimate offers lightning-fast roll rates, powerful verticals, and balanced control in every axis. The included cabane and interplane struts, functional ailerons on all four wings, and rugged gear make this model as durable as it is capable. Whether you're performing precision patterns or advanced freestyle, the Ultimate delivers energy and elegance in equal measure.
About the original:
The Ultimate biplane series was developed as a modern answer to classic aerobatic designs, blending vintage flair with cutting-edge performance. Known for its symmetrical wings, compact layout, and explosive flight characteristics, the Ultimate has become a favourite among sport and competition pilots alike.
Seagull Ultimate Biplane (20cc) 1.37m (54.3in) Key Features:
- Ultra lightweight, high quality balsa and ply construction.
- Beautifully covered in genuine Oracover film.
- Factory painted glass fibre engine cowl.
- Plug-in wing panels transport in one piece (top & bottom).
- Full hardware pack included.
- Ball link control surface connectors.
- Tough and forgiving dural undercarriage.
- Steerable tail wheel assembly.
- Colour-coordinated glass fibre wheel spats.
- Colour-matched plastic spinner.
- Wire braced tailplane.
- Includes electric motor mount conversion kit.
- Large canopy hatch for easy fuselage access.
What's in the Box:
- 1x Factory-finished fuselage assembly.
- 1x Factory assembled and covered 4-piece wing set.
- 1x Factory assembled and covered tail set.
- 1x Clear canopy moulding.
- 1x Pilot figure.
- 1x Undercarriage and wheel set.
- 1x Comprehensive hardware pack.
- 1x Tubular aluminium wing spar.
- 1x Comprehensive instruction manual.
Needed to Complete:
- 1x 20 - 26cc petrol engine, glow engine or Motor 2000, 270W, 85 - 110A ESC, 6s - 8s electric equivalent.
- 1x Propeller to suit chosen engine (17x8 - 19x10 Electric Prop).
- 1x 6-Channel computer transmitter and receiver combo.
- 6x Suitable high-quality digital servos.
- 1x Protective foam for radio system.
Seagull Ultimate Biplane (20cc) 1.37m (54.3in) Tech Specs:
- Approx. Flying Weight: 4.8kg / 10.6lbs
- Shipping Weight: 8.00kg / 17.64lbs
- Product Length: 1,510mm / 59.4in
- Product Wingspan: 1,380mm / 54.3in
- Product Wing Area: 64dm2 / 992in2
- Scale: 1:4.3
- Completion Level: ARTF
- Experience Level: Array
- Age Recommendation: 14+
- Recommended Usage Environment: Designated R/C model flying site
- Channels: 6
- Colour: Array
- Material: Balsa
Key Info:
- Brand: Seagull
- Part No: SEA389
- Barcode: 5051121274257
- Assembly Level: ARTF (Almost RTF)
- Power: Petrol
- Flying Style: Scale
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