Thanks for contributing guys!
You did not answer my very simple question, but told a lot of other already known things..
I have a good idea of how it all works mechanically. The waste heat produced by a petrol piston engine (especially with stone age tech) is MASSIVE compared to how little mechanical power you get out. That requires a
powerconsuming fan.
Typeertification requirement is adequate cooling for 5? minutes at worst condition. max alt, max temp, max gross, max pwr. + of course manufacturer safetymargin.
I don`t have an actual problem/case with a copter, just askin out of pure curiousity, if someone knows the number, cuz I can imagine that fan
sucks big hp`s for non lift purposes
