It was designed and produced by Hillberg Helicopters of Fountain Valley, California.
[1] The kit was designed specifically for the Rotorway Exec, to convert it to turbine power, under the US Experimental - Amateur-built aircraft rules.
The resulting aircraft features a single main rotor, a two-seats-in side-by-side configuration enclosed cockpit with a windshield, skid-type landing gear and a 150 hp (112 kW) Solar T62 turbo-shaft engine.
[1] The Hillberg conversion kit included the T62 engine, reduction gear clutch, tail rotor drive shaft and hangar bearings, main transmission and a new fuel tank.
[1] By March 2015 one example had been registered in the United States with the Federal Aviation Administration.