Originally Posted by
CGameProgrammerr
I don't mind him making his own avionics - getting it certified might be impossible (there's a reason Garmin has a near-monopoly) but otherwise it's fine. Making his own engine, though, is something literally no aircraft manufacturer in the world does or has ever done. It's completely asinine. Maybe it'll work out, but it's very likely to tank the whole project, that otherwise might have succeeded.
Don’t Konner helicopters make their own turbine?