Preliminary investigation of rolling moments obtained with spoilers on both slotted and plain wings (1932)
NASA Technical Reports Server (NTRS) · leaf 21
N.A.C.A. Technical Hote Ko.415 Plain Clark Y wing. CtLTveoL spoiler 7 per cent chord wide and 40 per cent semispan long. Spoiler deflection,63 Spoiler deflection,65 … Angle of attack, a Fig.11 Rolling-moment coefficient versas angle of attack. 7 per cent c loy 40 per cent "b/s curved spoiler at 20 per cent location on plain wing.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.