RCGF 120cc Twin Cylinder Gas Engine for Giant Scale RC Airplanes 12HP Smooth Power
Hero Section: The Sound of Authority
There is nothing quite like the deep, rhythmic purr of a twin-cylinder engine on the tarmac. It commands respect. If you are stepping up to giant-scale aircraft (30% to 35% scale), the RCGF 120cc Twin is the powerhouse you’ve been waiting for. It offers more than just brute force; it delivers the smooth, vibration-free operation that only a horizontally opposed "boxer" engine can provide. Imagine the sun glinting off your wings, the engine idling reliably at 1350rpm, and the shared excitement with your flying buddies as you prepare to unleash 12 horsepower into the sky. This is the pinnacle of RC aviation.
Why Choose the RCGF 120cc Twin?
- Silky Smooth Operation: Unlike single-cylinder engines that can shake an airframe apart, the horizontally opposed twin-cylinder design naturally cancels out vibration. This protects your expensive servos and airframe structure, ensuring your plane lasts longer.
- Realism and Sound: For scale warbirds or aerobatic giants, the sound is half the experience. This engine produces a realistic, low-frequency exhaust note that sounds like a full-scale aircraft, not a chainsaw.
- Massive Power on Demand: With 12HP and over 58 lbs (15kg) of static thrust, this engine provides unlimited vertical performance. Whether you are hovering a 3D monster or pulling a heavy warbird through a scale loop, the power is relentless.
- The Ultimate Enthusiast's Gift: For the pilot who has "flown it all," a twin-cylinder engine is a prized possession. It represents the serious side of the hobby—a perfect gift to mark a milestone or a shared project between father and son.
Technical Highlights: Engineering Mastery
- Boxer Configuration: The pistons move outwards simultaneously, balancing the reciprocating mass. This engineering choice is the secret behind the engine's incredible stability and low vibration levels.
- Reliable Fuel System: Equipped with a genuine Walbro carburetor, the engine offers consistent fuel metering across all G-forces. This means no sputtering during inverted flight or high-G turns.
- Advanced Cooling: The dual cylinders feature extensive cooling fins designed to handle the heat of large-displacement combustion. Combined with the air-cooled crankcase, it maintains optimal operating temperatures even during slow, high-load maneuvers.
Specifications
- Model Type: 2-Stroke Twin Cylinder Piston Valve Gasoline Engine
- Displacement: 120cc (7.32 cu in)
- Configuration: Horizontally Opposed Twin (Boxer)
- Bore x Stroke: 1.85 in (47mm) x 1.38 in (35mm)
- Performance: 12HP / 7500rpm
- Idle Speed: 1350rpm
- Static Thrust: 58.4 lb (15kg) @ 328 ft (100m) altitude
- Static Thrust: 51.8 lb (13kg) @ 5900 ft (1800m) altitude
- Carburetor: Walbro
- Ignition: DC-CDI (Computer Controlled Auto Advance)
- Power Supply: 6-14V (High Voltage Compatible)
- Spark Plug: 2 x NGK-CM6
- Lubrication Ratio: 30/1 (Gasoline/Oil)
- Suggested Propellers: 26 x 10, 26 x 12, 27 x 10, 28 x 10
- Engine Weight: 5.46 lb (2475g)
- Total Weight: 6.9 lb (3134g) approx. (Including Mufflers and Ignition)
Usage Scenario: The Main Event
It’s the highlight of the weekend fly-in. You wheel out your 100-inch wingspan extra. As you flip the prop, the RCGF 120cc fires up with a deep, authoritative growl. The lack of vibration is noticeable immediately—the wingtips aren't shaking violently like they would with a single cylinder. You taxi out, throttle up, and the plane lifts off in a fraction of the runway. Performing a low pass, the sound of the twin cylinders echoes across the field, drawing the eyes of every pilot present. It’s a moment of pure pride and mechanical joy.
Important Tips from the Expert
- Propeller Selection: For 3D aerobatics, a 28x10 propeller provides excellent punch out of a hover. For warbirds requiring more speed, a 26x12 is often preferred.
- Cooling is Critical: Ensure your cowling has adequate air exit holes. The rule of thumb is the exit area should be 3 times larger than the intake area to draw hot air out of the cylinders effectively.
- Break-In: Twin cylinders have more surface area to seat. Run high-quality synthetic oil at 30/1 and avoid overheating during the first few gallons.
Customer Support
Building a giant-scale plane is a commitment, and we are here to support you. For technical diagrams, tuning help, or parts, contact our expert team: service@helloworld7.com
