[1][2] The Arrow family of engines are modular in design and share the same pistons, cylinders and gearboxes assembled around different crankcase designs, giving one-, two- or four-cylinder engines.
The 250 is a conventional single-cylinder engine that weighs only 13 lb (6 kg).
The engine features single- or optional dual-ignition, reed valve induction, free air cooling, tuned exhaust system, a slide venturi-type Bing carburetor, fuel pump, Nikasil cylinder coatings.
The engine was offered with a gearbox reduction system that included a one-way clutch.
[1] The tuned exhaust supplied with the engine has been criticized as "cumbersome" and needing modification to fit most aircraft.