Exploratory investigation of the effectiveness of biplane wings with large-chord double slotted flaps in redirecting a propeller slipstream downward for vertical take-off

Author:	Kirby, Robert H.
Year:	1956
Document Type:	N/A
Series:	NACA Technical Notes
Report Number:	NACA-TN-3800
Link:	https://digital.library.unt.edu/ark:/67531/metadc56058/