Using motorcycle engines in light airplanes, including MALE (Medium Altitude Long Endurance) drones, is not a common practice for several reasons. While early airplanes did use motorcycle engines due to their availability and simplicity, modern aviation has evolved significantly, and there are important factors that limit the use of motorcycle engines in aircraft today. Here are some reasons:
Power and Performance: Aircraft engines are specifically designed and certified for aviation use, taking into account factors such as power output, reliability, and altitude performance. Motorcycle engines may not provide the necessary power and performance required for safe and efficient flight, especially in larger aircraft or drones with heavier payloads.
Weight and Size: Motorcycle engines are generally heavier than purpose-built aircraft engines, which can adversely affect the overall weight and balance of an aircraft. The compact size and lightweight construction of aircraft engines are optimized for aviation applications, allowing for better weight distribution and fuel efficiency.
Cooling and Reliability: Aircraft engines typically have better cooling systems to manage the heat generated during flight, which is crucial for maintaining performance and reliability. Motorcycle engines may not have the same level of cooling capacity, potentially leading to overheating issues during sustained operation at high power settings.
Safety and Certification: Aircraft engines are subjected to rigorous testing, certification, and regulatory standards to ensure safety and reliability. They undergo extensive testing for durability, vibration resistance, and compliance with aviation regulations. Motorcycle engines are not designed to meet these aviation-specific requirements.
Fuel Efficiency: Aircraft engines are optimized for fuel efficiency at the specific power settings and altitudes typically encountered during flight. Motorcycle engines are designed for different applications, and their fuel efficiency may not be as suitable for aviation use, especially during long-range flights.
Noise Considerations: Aircraft engines are designed to meet strict noise regulations to minimize their impact on the environment and communities around airports. Motorcycle engines, particularly those modified for enhanced performance or loudness, may not meet these noise standards, making them unsuitable for aviation use.
In summary, while motorcycle engines were used in early aviation, modern aircraft and drones require purpose-built engines that meet specific aviation requirements for power, performance, weight, reliability, safety, and fuel efficiency. Using motorcycle engines in aircraft today is not a prevalent trend due to these factors and the availability of more suitable options specifically designed for aviation purposes.