Using a KTM Duke 390 engine to build an ultralight helicopter is technically possible, but it would require extensive modifications and engineering expertise. Here are a few considerations:
Power and Weight: The KTM Duke 390 engine is designed for motorcycles and produces around 43 horsepower. While this may seem adequate for an ultralight helicopter, it's important to consider the weight of the engine itself. The KTM Duke 390 engine weighs around 36 kilograms (79 pounds), which is relatively heavy for an aircraft engine. The overall weight and power requirements of the helicopter will need to be carefully calculated to ensure safe and efficient flight.
Engine Configuration: The KTM Duke 390 engine is a single-cylinder, four-stroke engine designed for horizontal installation in motorcycles. To use it in a helicopter, you would need to develop a suitable mounting system and possibly modify the engine's orientation. The engine's cooling system and exhaust would also need to be adapted for aircraft use.
Transmission System: Helicopters require a complex transmission system to transfer power from the engine to the rotor blades. The KTM Duke 390 engine does not have an integrated transmission system, so you would need to design and build a custom transmission or use a pre-existing transmission system suitable for helicopter use. This can be a challenging and highly specialized task.
Safety and Certification: Building an aircraft, even an ultralight helicopter, requires adhering to strict safety standards and regulations. You would need to consult with aviation authorities or regulatory bodies in your jurisdiction to ensure compliance with safety requirements and obtain the necessary certifications and permits.
Expertise and Resources: Designing and building an ultralight helicopter is a complex undertaking that requires significant engineering knowledge and expertise in both aeronautics and mechanical systems. It's important to have access to appropriate resources, such as experienced engineers and aviation specialists, as well as access to suitable manufacturing facilities and materials.
In summary, while it may be technically feasible to use a KTM Duke 390 engine for an ultralight helicopter, it would require extensive modifications, specialized engineering knowledge, and compliance with aviation regulations. Building an aircraft is a highly complex task, and it is crucial to consult with experts in the field to ensure safety and adherence to legal requirements.