select correct answer from the options provided in the bracket Propeller momentum theory states that if propeller is at rest (flight speed is zero) then slipstream minimum diameter is _______ of the propeller disk diameter.(90%, 50%, 70%, 100%, 60%, 80%) In propeller momentum theory the induced velocity downstream is _____ times larger than induced velocity at the propeller disk.(0.25, 0.5, 1, 2, 3, 4)