Rotary‐Wing Aircraft: The Third of a Series of Articles Summarizing the Current State of Knowledge Available to Purchase

IN the theory of the rotaplane developed by Glauert (ref. 20) certain terms are neglected which become important at small angles of incidence of the rotor, i.e., at high forward speed. Lock (ref. 16) has removed some of the approximations in Glauert's theory and obtains the same expression for the profile drag as is given in Appendix I of reference 20, which Glauert derived by consideration of the energy account. This expression, viz.,