RCGF 70cc Twin Cylinder Gas Engine for RC Airplanes 7.4HP Low Vibration Smooth Power
Hero Section: The Symphony of Flight
There is a moment every pilot chases: the plane taxiing down the runway, the engine humming with a deep, rhythmic consistency that only a twin-cylinder can produce. The RCGF 70cc Twin is not just an engine; it is the upgrade that transforms your large-scale aircraft from a toy into a true machine. Whether you are building a scale warbird that needs a realistic sound or a 3D aerobat requiring smooth, linear power, this engine delivers. It’s about the shared smiles at the flying field, the pride of a perfect landing, and the bond formed over the mechanics of flight.
Why Choose the RCGF 70cc Twin?
- The "Boxer" Advantage (Low Vibration): Single-cylinder engines in this size class can shake an airframe violently. The RCGF 70cc features a horizontally opposed "boxer" design where the pistons move outwards simultaneously, cancelling out vibration. This protects your airframe, electronics, and servos, ensuring your investment lasts longer.
- Realistic Sound: For scale enthusiasts, sound is everything. This engine produces a throaty, low-frequency exhaust note that mimics full-scale aircraft. It turns heads the moment you fire it up.
- Power to Weight Ratio: Delivers a massive 7.4HP while maintaining a compact form factor. It fits perfectly in cowls designed for 50cc-70cc engines but offers the smoothness and torque of a twin.
- Reliability Standard: Equipped with a genuine Walbro carburetor, starting is easy and throttle response is crisp. No more fighting with the engine at the field; just flip and fly.
Technical Highlights: Precision Engineering
- Optimized Cooling: The dual cylinders are designed with deep cooling fins to maximize surface area. Combined with the air-cooled crankcase, this ensures the engine stays within optimal temperature ranges even during high-stress maneuvers.
- Stable Ignition: The included DC-CDI system handles voltages from 6V to 14V, allowing you to use modern LiPo or LiFe batteries directly. It provides a rock-steady idle at 1400rpm, making landings predictable and safe.
- Durable Construction: Built with a piston valve design and high-grade metal components, this engine is engineered to withstand the rigors of gasoline combustion, offering a long service life with proper maintenance.
Specifications
- Model Type: 2-Stroke Twin Cylinder Piston Valve Gasoline Engine
- Displacement: 70cc (4.27 cu in)
- Configuration: Horizontally Opposed Twin
- Bore x Stroke: 1.53 in (39mm) x 1.18 in (30mm)
- Performance: 7.4HP / 8600rpm
- Idle Speed: 1400rpm
- Static Thrust: 36.3 lb (15kg) @ 328 ft (100m) altitude
- Static Thrust: 33.1 lb (13kg) @ 5900 ft (1800m) altitude
- Carburetor: Walbro
- Ignition: DC-CDI (Computer Controlled Auto Advance)
- Power Supply: 6-14V
- Spark Plug: 2 x NGK-CM6
- Lubrication Ratio: 30/1 (Gasoline/Oil)
- Suggested Propellers: 22 x 10, 23 x 8, 23 x 10, 24 x 8
- Engine Weight: 3.42 lb (1550g)
- Total Weight: 4.4 lb (2000g) approx. (Including Mufflers and Ignition)
Usage Scenario: The Sunday Morning Ritual
Imagine a crisp Sunday morning. You and your flying partner—perhaps your son or a lifelong friend—unload the trailer. You mount the wings on your 90-inch aerobat. As you prime the RCGF 70cc, the fuel flows visibly through the lines. A couple of flips and the twin cylinders roar to life, settling into a smooth idle that doesn't rattle the plane's tail. You take off, the engine pulling vertically with authority. The sound echoes off the trees. It’s not just a hobby; it’s a passion that connects you to the engineering and the people you fly with.
Important Tips from the Expert
- Propeller Selection: A 24x8 propeller is often the "sweet spot" for this engine, offering excellent thrust for vertical maneuvers and good braking on downlines.
- Cooling Airflow: Since this is a twin, ensure your cowl has air baffles to direct air over both cylinders equally. The exit hole in the cowl should be at least 3 times the size of the intake to prevent overheating.
- Break-In: Treat the engine gently for the first 2 gallons. Use a high-quality synthetic 2-stroke oil at a 30/1 ratio. A well-broken-in twin will serve you for years.
Customer Support
We are committed to your success in the air. If you need assistance with installation, tuning, or parts, our expert team is ready to help: service@helloworld7.com
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