초록 ▼

An air-borne craft is provided with at least two pairs of propellers with substantially vertical axes. One pair of the propellers is provided on the front portion of the craft, the other pair on the rear portion with one propeller of each pair on the left side and the other propeller of the same pai

An air-borne craft is provided with at least two pairs of propellers with substantially vertical axes. One pair of the propellers is provided on the front portion of the craft, the other pair on the rear portion with one propeller of each pair on the left side and the other propeller of the same pair on the right side of the body of the craft. The propellers are provided on their rear directions with flaps which can open and close relative to the profiles of the propellers. The arrangement of at least four propellers secures an economical operation in case of emergency landing and at flight. In case of an engine failure the craft has still a forwardly directed speed. This speed will open the flaps and the flow of air against the flaps will revolve the propellers. Thereby at least one arm of each of the propellers remains acting like a helicopter blade and the four propellers can carry the craft in a gliding procedure, flying forwardly with an angle of descent, towards the ground for the emergency landing.

대표청구항 ▼

An airborne craft, comprising, in combination, a body with at least two pairs of holding means with one holding means of the respective pair of holding means extending to the left from said body while the other holding means of the respective pair of holding means extends to the right from said body

An airborne craft, comprising, in combination, a body with at least two pairs of holding means with one holding means of the respective pair of holding means extending to the left from said body while the other holding means of the respective pair of holding means extends to the right from said body with one of said pairs constituting a front pair of holing means provided on the front portion of said body and another pair of said holding means, constituting a rear pair of holding means, provided on the rear of said body, individual propellers of equal size and air foil configuration relative to the surrounding air with said propellers revolvably borne on said holding means at least indirectly, a power plant provided on said craft, transmission means between said power plant and said individual propellers to revolve said propellers, a means to divide the power of said power plant into at least four equal individual fractions of power with the number of said fractions equal to the number of said propellers, individual transmission portions of said transmission means with said individual portions provided for the transfer of said individual fractions of power to the respective propellers, overrunning free wheeling arrangements between said transmission portions and said individual propellers, wherein three blades are provided by each of said individual propellers with said blades angularly equally spaced from the center of the respective propeller, wherein the propellers on the right side of said body are subjected to anti-clockwise revolution while the propellers on the left side of said body are subjected to clock-wise revolution, wherein individual flaps are provided on the radial inner and rear portions of said blades of said propellers with said flaps borne with their roots in pivot beds of said blades to permit said flaps to pivot from an angle substantially parallel to the chord of the respective blade to an angle inclined to said chord, and vice versa, and, wherein a control means is provided on said craft to effect the inclination of the longitudinal axis of said craft relative to the horizon for inclining the front of said craft slightly downwards when said power plant fails, whereby said propellers are forced to continue to revolve due to the air flows against the rears of said flaps during forward flight of said craft, while the location of said propellers relative to said body of said craft maintain the stable direction of said craft and the equal speed of revolution of said propellers in the surrounding air.