Figa. 2 & 3 N.A.C.A. Aircraft Circular No. 20 … the auxiliary airfoil and opens^and closes the leading-edge slot. The auxiliary airfoil is carried on a series of duralumin%members which form part of a parallel link gear. This link gear is shown dlagrammatically Jn the lower left-hand corner, and in perspective in the center of the illustration.…
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
