Building a helicopter using a motorcycle engine is theoretically possible, but it would be an extremely complex and challenging endeavor. It's important to note that designing and constructing a safe and functional helicopter requires a deep understanding of aerodynamics, engineering principles, and aviation regulations.
Here are a few considerations to keep in mind:
Power and Thrust: Helicopters require a significant amount of power to generate lift and maintain flight. While motorcycle engines can provide a decent amount of power, they may not have sufficient thrust or power-to-weight ratio to lift and sustain the weight of a helicopter, including the rotor system, airframe, fuel, and occupants.
Rotor System: Designing an effective and safe rotor system is a complex task. Helicopter rotors need to be carefully engineered to produce lift, provide stability, and control the aircraft's flight characteristics. Simply attaching a motorcycle engine to a rotor system without appropriate design and engineering would likely lead to instability and unsafe flight conditions.
Structural Considerations: Helicopter airframes are subjected to significant stresses and loads during flight. They need to be designed with the necessary structural integrity to handle these forces. Motorcycle engines are not typically designed or tested for the unique stresses associated with helicopter flight, so adapting them for this purpose would require extensive modifications and engineering expertise.
Safety and Certification: Building a helicopter requires compliance with stringent safety regulations and certification processes. These ensure that the aircraft meets specific safety standards and can operate safely in various flight conditions. Achieving certification for a homebuilt helicopter is a complex and time-consuming process that involves meeting regulatory requirements and undergoing thorough inspections and tests.
Given the complexity and safety considerations involved, it is strongly recommended that you consult with aviation experts, engineers, and regulatory authorities with experience in helicopter design and construction before embarking on such a project. They can provide valuable guidance, ensure compliance with regulations, and help ensure the safety and feasibility of your helicopter-building endeavor.