Twin 1,
Yes, theoretically helicopters can fly inverted for sustained periods, but lot's but lot's of systems would have to be designed differently from the outset to accomplish this. Such as - hub would need to produce massive control moments to counter static instability, you would need a high performance stability augmentation system, the fuel system would need to be pressurised & and the engines modified to be intolerant to attitude. To mention but a few!
Incidentally, on the subject of negative pitch and coning - the Lynx has some negative collective pitch travel and consequent negative coning to pin it to the rolling decks of ships in rough seas prior to being lashed down.
What were you intending to do for your project and where are you studying?
CRAN
Last edited by CRAN; 15th May 2002 at 14:32.