Test Results From A Dynamic Model Dynaflex Rotor

A one-fifth scale dynamic model of the Sikorsky Dynaflex rotor has been tested in hover and in forward flight conditions in the United Technologies Research Center Wind Tunnel. The Dynaflex rotor features an advanced composite structure which flexes to provide a constant speed universal joint action. Testing concentrated on confirming that the stability and dynamic response of the rotor were satisfactory. Lift conditions of up to .11 Ct/sigma and advance ratios as high as .46 were reached. Vibratory loads were comparable to those of articulated rotors. The Dynaflex rotor concept appears to be a practical concept from the standpoint of dynamic response and stability.