Abstract: A dual engine drive system for a single propeller shaft includes a single torque-combining gearbox separated from the engines by gearbox input shafts. The engines, gearbox and propeller shaft are mounted as a unit on a common support frame adapted for installation in existing fixed-wing, single-engine aircraft. Each input shaft drives its own primary gear train within the gearbox. Each gear train includes its own output gear coupled to the propeller shaft through an overrunning clutch. An auxiliary drive train driven by the propeller shaft drives redundant propeller governors, an overspeed governor, and an oil pump for lubricating the propeller shaft and auxiliary gear train. The primary gear trains also drive oil pumps for lubricating their own gearbox sections. The three oil pumps are in separate subcircuits of a common oil circuit, and a mechanism is provided for enabling an operating oil pump of one subcircuit to supply oil to another subcircuit if the oil pump in such other circuit fails.

Abstract: A turbine engine drive and mounting assembly for a propeller-driven, fixed-wing aircraft includes an open support frame resiliently mounted to and cantilevered from an air frame portion of the aircraft. A gearbox is rigidly mounted to the free end of the open support frame and is adapted for mounting and driving a propeller. A turbine engine is positioned within the support frame in spaced relation to the gearbox. The turbine engine is suspended from a ring member of the support frame so as to enable expansion and contraction of the engine relative to the support frame and pivoting of the engine on the ring member for maintenance. The engine is drivingly connected to the gearbox through flexible couplings. High torque loads at the gearbox are transmitted through the support frame directly to the air frame, bypassing the engine.

Abstract: A portable heliport adapted to be transported by a helicopter is described. The heliport includes a pair of deck extensions having foldable, extensible legs and which are hinged to a central deck supported by extensible legs. The deck extensions are folded and allowed to unfold by a winch which is detachable from the central deck and whose winch support also supports the deck extensions for transport by the helicopter. The extensible legs have threaded tubes telescoping in fixed tubes and quick releasable internally threaded, split clamps attached to the fixed tubes hold the threaded tubes in adjusted positions. The threaded tubes may be screwed into or out of the split clamps for fine adjustments. The legs on one side of the deck are longer than those on the opposite side so that, when the legs are all in contracted conditions, the port is in a condition adapted to a moderate slope site.