How fast does a rotor like the ones on a helicopter have to go to lift one pound if it is inch?

Question

please give me any more info about it such as what angle are the blades slanted at ect.

Answer 1

Its very dificult to give any exact speed with such a little info. However the formulae for lift is (1/2)(density)(velocity^2)(rotor area)(CL)

in this CL is co-efficient of lift which depends on rotor balde leading edge thickness, aspect ation, conditioon of surface etc etc........

the angle of blade slanted is known as angle of attack, and how much angle of attack is required to produce lift for any given weight again depends on above mentioned factors.

as a thumb rule u can remember that for a given amount of lift at high speed u require less angle of attack, at slow speed -- high anle of attack (till certain limit) is required