Bell has developed a pair of Autonomous Pod Transport (APT) scalable modular unmanned vertical take-off and landing (VTOL) aircraft capable of transporting payloads such as medical equipment, ammo, and water, among others.
Todd Worden, Bell senior manager for advanced tiltrotor systems, told Jane’s on 16 April that these two tail-sitting aerial resupply systems aircraft are called APT 20, for 20 lb (9 kg) payloads, and the larger APT 70, for 70 lb payloads. As the aircraft is scalable, Bell has an eventual goal of carrying a 1,000 lb payload with APT.
APT uses VTOL then transforms into wing-borne flight, flying nearly hoizontally, on its bi-wing design, to provide more efficient flight than by flying on the rotor system. The aircraft is powered by an electric/hybrid propulsion system.
The APT aircraft are not tiltrotor, although they appear to be so on first glance. John Wittmaak, Bell programme manager for small and medium APT, told Jane’s that the aircraft flies much like a multirotor, which uses differential thrust before leaning into horizontal flight. As it increases speed, the APT’s wing becomes more effective, lifting the aircraft up and allowing the rotors to be used for thrust. Wittmaak said the faster the aircraft flies, the higher it can lift.
APT 70, on mockup display at the 2019 Army Aviation Association of America (AAAA) Summit, can fly 56 km one way with a 36 kg payload and can fly 24 km two ways with the full payload weight. APT 70’s range one way with payload and one way without payload is 29 km. APT 70 has a cruise speed of 75 mph (121 km/h), but Wittmaak said that the company has flown the smaller APT 20 at over 100 mph.
Worden said Bell started developing the APT family of aircraft in response to Pentagon requirements.
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