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Effects of Propellers and of Vibration on the Extent of Laminar Flow on the NACA 27-212 Airfoil
Report presenting an investigation of the effects of propellers and of vibration on the extent of laminar flow on the NACA 27-212 airfoil by testing the airfoil in conjunction with a tractor and a pusher propeller and with a mechanical vibrator. The results show that neither the pusher propeller nor vibration with amplitudes up to 0.094 inch and with a frequency of 1650 cycles per minute had any consequential effect on the extent of laminar flow but that the tractor propeller had a very pronounced effect.
Date:
October 1939
Creator:
Hood, Manley J. & Gaydos, M. Edward
System:
The UNT Digital Library
Ground-cooling and flight tests of an airplane equipped with a nose-blower engine cowling
Report presenting flight and ground-cooling tests with a Northrop A-17A attack airplane to determine the merits of a nose-blower engine cowling designed and built at the NACA laboratory. The main objective was to determine the cooling characteristics of the nose blower, especially for ground and low-speed operation. Results regarding the cooling properties, engine pressure drop, and maximum speed and drag are provided.
Date:
October 1939
Creator:
Turner, L. I., Jr.
System:
The UNT Digital Library