Arrow 250

The Arrow 250 is a family of single-cylinder, two-stroke, single- or dual-ignition aircraft engines that were designed for ultralight aircraft by Arrow SNC of Italy.^[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.^[1] Arrow engines are no longer in production.

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. Starting is electric starter with no provision for a recoil starter.^[1]

The tuned exhaust supplied with the engine has been criticized as "cumbersome" and needing modification to fit most aircraft.^[1]

250

Gasoline aircraft engine, 34 hp (25 kW). Out of production.^[1]

270 AC

Gasoline aircraft engine, 35 hp (26 kW) at 6800 rpm, weight 13.2 lb (6.0 kg) with carburetor, alternator, fuel pump and starter. Out of production.^[2]

Data from Cliche^[1]

• Type: Single-cylinder, two-stroke aircraft engine
• Displacement: 250 cc (15.26 cu in)
• Dry weight: 13.2 lb (6 kg)

• Valvetrain: reed valve
• Oil system: premixed oil and fuel
• Cooling system: air-cooled
• Reduction gear: gearbox

• Power output: 34 hp (25 kW)

• List of aircraft engines
• Hirth F-263
• Rotax 377