Wind tunnel investigation of control-surface characteristics XXIII : a 0.25-airfoil-chord flap with tab having a chord twice the flap chord on an NACA 0009 airfoil

Spearman, M. Leroy.
naca-wr-l-47
1945

(abstract not available)

An Adobe Acrobat (PDF) file of the entire report:
http://naca.central.cranfield.ac.uk/reports/1945/naca-wr-l-47.pdf