However, with only one engine on-board, they are also often only a small malfunction away from becoming a heavy, unpowered glider in dire need of somewhere to land. To help improve this situation, researchers at Universidad Carlos III de Madrid (UC3M) and AXTER Aerospace have created an auxiliary electric propulsion unit designed to be installed in conventionally-powered light aircraft to both increase available power and provide extra range in the event of an engine failure.

Primarily aimed at improving the safety of light passenger aircraft with masses of up to 750 kg (1,650 lb), the retrofittable electric propulsion system has been created in direct response to a perceived need in the light aircraft space. 

"We are trying to saves lives and prevent accidents related to loss of power during flights, when the engine fails or the fuel runs out," says Miguel Ángel Suárez, from AXTER Aerospace. "We mustn't forget that every year in Europe and USA there are an average of 600 accidents, 70 deaths and 24 million euros (US$27 million) in losses recorded."