Advanced Technology Institute of Commuter-helicopter, Ltd.

Makoto Aoki

Eiichi Yamakawa

Hiroki Nishimura

Upper and lower surfaces of an aerofoil are defined by the following coordinates given in the table below, and the configuration of a leading edge of the aerofoil is defined by the following leading edge radius and the center of circle. Thus drag divergence Mach number Mdd and maximum lift coefficient Clmax can be increased and the noise level can be reduced.

Helicopter blade aerofoil

The coordinates defining the upper surface, lower surface, leading edge configuration and center of circle for a helicopter blade airfoil are given to increase maximum lift coefficient and lift-to-drag ratio, and to reduce noise level.

Growing community of inventors

Kakamigahara, Japan

Makoto Aoki