This is the adaptation of a turbine starter motor to be used as a turboprop on ULM and VLA.

-It is based on the starter of the A7 Corsair or Douglas A4M aircraft, it is the Garrett JFS 100-13A. A starter turbine that uses jet fuel (kerosene).

“Garrett JFS100-13A” (photo Pleiadean)

-The adapted engine with its accessory box and outlet for the propeller, delivers 90 HP at 3,100 rpm.

“Interesting adaptation by Scott Ehni”

-Weighing 140 lbs in total from the firewall onwards, it uses a 60 inch diameter CAP-140 three-blade propeller. Before reduction, the turbine rotates at full power at 72,000 rpm.

-The assembly is initially planned for ULM such as the Zenair, Zodiac and the Stolch.

“Scott Ehni powertrain”

In the photograph we can see it mounted on a Zodiac where the exhaust is divided into two horizontal outlets in the style of the Walter M-601.

-In the accessory box there is an alternator, a vacuum pump for the instruments and a set of three-body pumps for lubrication and to move the oil through the gearbox to the filter, tank and again to the engine.

“Two views of the Scott Ehni assembly with the JFS100”