RCGF 21cc Twin Cylinder Gas Engine for RC Airplanes 2.8HP Miniature Boxer Engine
Hero Section: A Mechanical Miracle in Your Hangar
There is something undeniably captivating about miniature engineering. The RCGF 21cc Twin is one of the smallest twin-cylinder gasoline engines in the world. It takes the prestigious "boxer" configuration usually reserved for giant-scale aircraft and shrinks it down to fit your .90 to 1.20 size sport planes. Imagine the look on your friends' faces when you remove the cowl of your Cessna or Piper Cub to reveal two precision-machined cylinders. It’s not just an engine; it’s a conversation starter, a work of art, and the smoothest power plant you will ever bolt onto a firewall.
Why Choose the RCGF 21cc Twin?
- The World's Smallest Gas Twin: This engine allows you to enjoy the sound and look of a twin-cylinder engine on airframes that previously could only take a single cylinder or a glow engine. It is the ultimate upgrade for scale realism.
- Vibration? What Vibration?: Single-cylinder engines in this size class can be shaky. The RCGF 21cc uses a horizontally opposed design where the pistons fire outward simultaneously, canceling out vibration. Your airframe lasts longer, and your flight is silky smooth.
- Reliability in Miniature: Despite its small size, it doesn't compromise on features. It uses a genuine Walbro carburetor for easy starting and consistent tuning.
- Compact Installation: It utilizes smaller 1/4-32 (ME-8) spark plugs to keep the overall width compact, allowing it to fit inside many standard cowls without cutting massive holes.
Technical Highlights: Precision Engineering
- Optimized Crankcase: The crankcase is CNC machined from high-grade aluminum alloy to ensure perfect alignment of the tiny pistons. This precision reduces friction and heat, which is critical for small-displacement engines.
- Smart Ignition System: The included DC-CDI ignition is specifically tuned for this engine. It provides a hot spark for the small combustion chambers and automatically adjusts timing for a stable idle at 1600rpm and a responsive throttle up to 8500rpm.
- Scale Sound: It produces a unique, fast-paced "purr" that sounds significantly different from a standard single-cylinder engine. It adds a layer of acoustic depth to your flying experience.
Specifications
- Model Type: 2-Stroke Twin Cylinder Piston Valve Gasoline Engine
- Displacement: 21cc (1.28 cu in)
- Configuration: Horizontally Opposed Twin (Boxer)
- Bore x Stroke: 1.08 in (27.6mm) x 0.67 in (17mm)
- Performance: 2.8HP / 8500rpm
- Idle Speed: 1600rpm
- Static Thrust: 13.6 lb (6.2 kg) @ 328 ft (100m) altitude
- Static Thrust: 12.1 lb (5.5 kg) @ 5900 ft (1800m) altitude
- Carburetor: Walbro
- Ignition: DC-CDI (Computer Controlled Auto Advance)
- Power Supply: 6-14V
- Spark Plug: 2 x ME-8 (1/4-32 thread) (Note: Smaller than CM6)
- Lubrication Ratio: 30/1 (Gasoline/Oil)
- Suggested Propellers: 15 x 8, 16 x 8
- Engine Weight: 1.62 lb (734g)
- Total Weight: 2.4 lb (1100g) approx. (Including Mufflers and Ignition)
Usage Scenario: The Scale Enthusiast's Dream
It’s a calm evening. You are prepping your 1/5 scale Cub or a vintage biplane. You aren't looking for unlimited vertical performance; you want realism. You flip the prop, and the RCGF 21cc hums to life. The idle is steady and quiet. As you taxi out, the plane feels solid, not shaking apart. In the air, the engine provides plenty of torque for scale loops and rolls, and the sound is just right—a mechanical symphony that connects you to the golden age of aviation.
Important Tips from the Expert
- Spark Plug Care: This engine uses 1/4-32 (ME-8) spark plugs, which are smaller and more delicate than the standard CM6 plugs found on larger engines. Be careful not to over-torque them during installation.
- Propeller Selection: A 16x8 propeller is the ideal choice for most airframes, offering the best balance of thrust and cooling airflow.
- Tuning: Small twins can be sensitive to tuning. Make small adjustments to the carburetor needles (1/8 turn at a time) and allow the engine to settle before adjusting again.
Customer Support
We share your passion for unique engines. If you have questions about mounting dimensions or tuning this miniature twin, our team is ready to assist: service@helloworld7.com
