초록 ▼

An unmanned aircraft of the remotely piloted type that is characterized by its configuration and outline using rigid counter rotating propellers, positioned substantially at the height of its center of mass or slightly below to allow producing a sufficiently large control moment to use a tether line

An unmanned aircraft of the remotely piloted type that is characterized by its configuration and outline using rigid counter rotating propellers, positioned substantially at the height of its center of mass or slightly below to allow producing a sufficiently large control moment to use a tether line for landing the aircraft and to allow using two substantially spheroidal surfaces at the top and bottom respectively rather than a single one relatively larger and more detectable surface as when the propellers are at the top.

대표청구항 ▼

An unmanned, remotely piloted aircraft comprising: a main body symmetrical about a vertical axis comprising three separable, vertically stacked body sections; the uppermost one of said body sections including means to enclose and support a propulsive engine; a propulsive engine contained within and

An unmanned, remotely piloted aircraft comprising: a main body symmetrical about a vertical axis comprising three separable, vertically stacked body sections; the uppermost one of said body sections including means to enclose and support a propulsive engine; a propulsive engine contained within and supported by said uppermost body section; a fuel tank in said uppermost body section arranged to laterally surround at least a major portion of said engine; the intermediate one of said body sections including means to support a gear box connectable with said engine, a pair of vertically arranged counterrotating propeller hubs and propeller blades secured thereto, and pitch control means for the propeller blades; a centrally located gear box enclosed within said intermediate one of said body sections and supported by said means to enclose and support said gear box; a pair of vertically spaced counterrotating propeller hubs connected together for being jointly driven by said engine through said gear box enclosed within and supported by the intermediate body section; variable pitch propeller blades secured to said hub through a rigid connection arranged to permit the pitch of the propellers to be changed; pitch control means enclosed by and supported by said intermediate body section connected to the propeller blades and arranged to control the pitch of all the propeller blades simultaneously in a collective and/or differential sense; the lowermost one of said body sections including means for containing and supporting a payload of known mass; a payload of known mass contained within and supported by said lowermost body section; said propeller hubs located substantially in the horizontal plane including the center of mass of the aircraft with said payload.