Bernard Hooper Engineering Ltd. works with several types of engines, some of them aimed at motorizing UAV. See BHE.

-The so-called "Stepped Piston engines" are intended for that use, using multi-fuels. It also prepares them for motorcycles, cars, marine and industrial.

“Hooper SPV-1000”

-The SPV-1000 is a V4, giving 55 kW at 5,250 rpm.

-In their catalog, they offer an engine with two horizontally-opposed cylinders of 88 cc giving 4.7 kW at 7,500 rpm, and intended for the Sprite and the Observer UAVs.

“Hooper 88-H”