Aeronautics and astronautics – Aircraft power plants – Transmission of power
Patent
1980-02-13
1983-09-20
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft power plants
Transmission of power
244 1711, B64D 3500
Patent
active
044051034
ABSTRACT:
A helicopter-like craft has plural propellers with substantial vertical axes which can be inclined forwardly to provide the forward movement of the vehicle. The propellers are driven by hydraulic fluid motors. One embodiment features the application of a four flow hydraulic pump which supplies two pairs of hydraulic pressure fluid flows, wherein the rate of flow in fluid in each flow of the pairs are equal. One of the pairs of flows may be of permanently fixed rate of flow but the flows of the other pair of flows is variable, but variable in such a system, that even at variation of rate of flow the rate of flow of the two flows of the variable flow--pair remains equal relatively to the other flow of the pair. This system of hydraulic drive is utilized to let the two front propellers of an airborne craft run with equal velocity even when the speed thereof is varified by the mentioned variablity in order to incline the vehicle into its forward movement. The two rear propellers are also forced to run at equal speeds. In another embodiment the plural deliveries of the flows are utilized to maintain flight of the vehicle when one of the fluid lines breaks or fails to deliver. The features of the arrangements are, that the airborne craft of the invention is easily controllable, does not depart from a desired straight forward flight path and that it will be able to continue a flight or to afford a safe landing, when one of the delivery flows fails.
REFERENCES:
patent: 3253806 (1966-05-01), Eickmann
patent: 3253807 (1966-05-01), Eickmann
patent: 3398698 (1968-08-01), Eickmann
patent: 3497162 (1970-02-01), Eickmann
patent: 3614029 (1971-10-01), Eickmann
patent: 3690398 (1972-09-01), Hause
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