When considering a motorcycle engine for a lightweight homemade plane, there are a few key factors to consider:
Weight and Power-to-Weight Ratio: Since weight is a critical consideration in aviation, you would want to choose a lightweight motorcycle engine that offers a favorable power-to-weight ratio. Engines with a higher power output relative to their weight would be preferable for aircraft use.
Reliability: Aircraft engines need to be highly reliable to ensure safe and consistent operation. Look for a motorcycle engine known for its reliability and durability, as aircraft engines need to withstand continuous operation at higher RPMs and in varying conditions.
Cooling: Aircraft engines must maintain optimal operating temperatures during flight. Air-cooled motorcycle engines can be suitable for light aircraft, as they offer simplicity and weight savings compared to liquid-cooled engines. However, liquid-cooled engines can provide more consistent cooling performance, especially in warmer climates or during prolonged high-power operations.
Engine Orientation: Consider the engine's orientation and whether it can be easily adapted for aircraft use. Some motorcycle engines are designed for horizontal mounting, while others are vertical. The engine's mounting configuration should align with the aircraft's design and ensure proper airflow, lubrication, and cooling.
Propeller Compatibility: Ensure that the motorcycle engine can be effectively coupled with an aircraft propeller. You may need to consider modifications or adaptations to connect the engine output to the propeller, such as a gearbox or belt drive system, to achieve the desired RPM and thrust.
Certification and Legal Considerations: It's crucial to research and understand the aviation regulations and certification requirements in your country or region. Certain engines may have specific certification or approval for aviation use, while others may not. Compliance with relevant regulations is essential to ensure safe and legal operation of your homemade aircraft.
It's important to consult with experienced aviation experts, aircraft builders, or aviation authorities for guidance and recommendations specific to your project. They can provide valuable insights, advise on engine options suitable for aircraft use, and help ensure your aircraft meets the necessary safety standards and regulations.