View Full Version : Doubts to make an helicopter

12-09-2018, 06:05 AM
Hello, I'm doing a helicopter for two persons with a friend, but I do not know how to calculate through the power of the engine, the performance of the propellers depending on his radius.

In short, what I want are the two formulas that relate these two variables that I need to make a table testing with different engines and different measures of the propellers (apart also if it is possible to also take into account the number of propellers).

I do not know if I explained well...

12-09-2018, 09:14 AM
Helicopters don't typically have "propellers." They have rotors and they are more involved than just providing vertical thrust. I think you need some basic research before you start commiting to a design. There are a number of helicopter theory books out there. You might find this book a useful start: https://www.amazon.com/Ultralight-Helicopter-Experience-History-Testing/dp/151162695X/ref=asc_df_151162695X/?tag=hyprod-20&linkCode=df0&hvadid=312152840806&hvpos=1o1&hvnetw=g&hvrand=16342552008905555414&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9007807&hvtargid=pla-569221934145&psc=1&tag=&ref=&adgrpid=61316181319&hvpone=&hvptwo=&hvadid=312152840806&hvpos=1o1&hvnetw=g&hvrand=16342552008905555414&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9007807&hvtargid=pla-569221934145