The Nature of Air Flow About the Tail of an Airplane in a Spin (1932)
NASA Technical Reports Server (NTRS) · leaf 9
N.A.C.A. Technical Note No.421 Pigs.6.7,8 … Pig,6 Plow pattern for right spin and generator at third position. and generator at third position. (c) (ci) Pig.9 Plow patterns for entry into left spin with generator at second position.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
