NASA-TN-D-318

Abstract

An investigation of propeller performance, including in-plane forces and out-of-plane moments, has been made for three propellers operating through a range of thrust-ads angles of attack from O&#176; (horizontal) to 85&#176;. The operating conditions were selected to simulate those anticipated for VTOL/STOL aircraft in the take-off, landing, and transition regimes. The propellers differed widely in plan form and included one with flapping hinges. <br>The results of the investigation revealed that for all three propellers similar variations in the forces and moments with thrust-axis angle of attack and advance ratio were present. Further, the thrust and power were nearly constant and in-plane forces and out-of-plane moments increased approximately linearly over large ranges of thrust-axis angle of attack for constant blade angles and effective advance ratios.