Founded in 2006 by Deborah and Roger Hayes in Tehachapi, California, USA, Sierra Technical Services has created the Fledermauser models of hybrid-electric cargo and passenger aircraft and each model has the ability of conventional takeoff and landing (CTOL), short takeoff and landing (STOL) and vertical takeoff and landing (VTOL) aircraft. Alfaro created, patented and have licensed the Fledermauser aircraft to Sierra Technical Services for development. According to the company, Fledermauser configuration can potentially provide a higher degree of speed, safety, resilience and variable sound mitigation compared to open rotor systems of similar weight and technology level for military missions in particular.
The Fledermauser is a remote or autonomous hybrid-electric CTOL/STOL/VTOL cargo concept design aircraft designed to provide multirole airpower for military austere operations. The aircraft has 32 electric ducted fans with trailing edge flaperons and is powered by a turbine-electric powerplant and batteries. The estimated cruise speed is 178 mph (286 km/h), has a maximum range of 215 mph (346 km/h), has a range 523 miles (841 km) and has flight time 2-1/2 hours. The empty weight of the aircraft is 930 lb (421 kg), maximum payload 260 lb (117 kg) and maximum takeoff weight 1,190 lb (538 kg).
The FM1 has six inch diameter Electric Ducted Fans (EDF), is the smallest concept design the company has made. The aircraft has a patented fixed box wing design and each wing has eight electric ducted fans. The fuselage has a central payload bay and has retractable quadricycle landing gear. The aircraft has been made specifically for the US military for land-based and ship-to-shore cargo missions.
Safety features: Distributed Electric Propulsion (DEP), provides safety through redundancy for its passengers and/or cargo. DEP means having multiple propellers (or ducted fans) and motors on the aircraft so if one or more propellers (ducted fans) or motors fail, the other working propellers (or ducted fans) and motors can safely land the aircraft. There are also redundancies of critical components in the sub-systems of the aircraft.
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