Crab I am just never rude to you at all, but you are sarcastic, rude and unclear.
are you trying to suggest that weight is more critical in a car than a helicopter? (seems odd, if that is what you are saying (unclear), you'll have to explain why). You think you know more than i do about fundamental car 'PoF' too? (showdown? £10k says you don't, if I win proceeds to next pprune bash!)
and incidentally the only brake failure accident I know of happened in a car with a dual (redundant) brake system design (Bentley).
Ref VRS Crab: "Don't worry about VRS - you won't get near the RoD required (probably somewhere around 12 - 1500'/min for your aircraft)."
That I guess originates from the recent opinion that VRS won't occur untill half the downwash speed? I don't think that is true nor helpful and as such would constitute dangerous advice. I have found that you can neatly slip into VRS at about 1/8th to 1/4 of the downwash speed.
tread drift re cars sorry - I'll probably get in trouble again but I am only answering crab's rather rude thread drifting point, crab won't get in trouble for this since he seems to be 'teachers pet'. I'm already in trouble for suggesting that the multi engine maths gets better for more engines (3,4,5). Although I am not allowed to say that IMO it's not worth it since the reliability goes down, KISS is a dirty word around here.
PS according to Nick L, Crab also seems to be quite wrong about the risk of engines being shot out, the Huey experience in Veitnam being an excellent example of utility of payload vs redundancy. thank you Nick.