Helicopter rotor blade with improved performance characteristics

摘要

In a helicopter rotor blade having a root end for attachment to a rotor head, a central portion of constant chord dimension and a tip portion having a chord dimension greater than that of the central portion, an outboard region of the central portion has a negative basic pitching moment coefficient, an inboard region of the central portion has a basic pitching moment coefficient more positive than that of the outboard region and the tip portion has a positive basic pitching moment coefficient.