Two airfoil plans were used for propeller blades. One is modified Clark Y section designed for structural reliability and the second an NACA 16 airfoil section designed to produce minimum aerodynamic losses. At low air speeds, the propeller designed for aerodynamic effects showed a gain of from 1.5 to 4.0 percent in propulsive efficiency over the conventional type depending on the pitch. Because of the numerous variables involved, the effect of each one on the aerodynamic characteristics of the propellers could not be isolated.
The Characteristics of Two Model Six-blade Counterrotating Pusher Propellers of Conventional and Improved Aerodynamic Design
1942-04-01
Miscellaneous
No indication
English
PROPELLERS - CHARACTERISTICS , Aerodynamics , PROPELLERS - PROPULSIVE EFFICIENCY , PROPELLERS, TANDEM - WIND TUNNEL TESTS , PROPELLERS, PUSHER - EFFICIENCY , PROPELLERS BLADES - SETTING , PROPELLERS, SIX-BLADE , AIRFOILS - NACA 16-SERIES PROPELLER , CHARTS - PROPELLERS , WIND TUNNEL TESTS (NACA - PRESSURE-19 FT) , AIRFOILS - CLARK Y (MOD ) PROPELLER
Engineering Index Backfile | 1942
|Calculation of counterrotating propellers
TIBKAT | 1949
|Pressure field near counterrotating propellers
Engineering Index Backfile | 1962
|