The Arrow 1000 is a four-cylinder, horizontally opposed, two-stroke, single- or dual-ignition, aircraft engine that was designed for float-equipped 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 1000 is a conventional four-cylinder engine that weighs 145 lb (66 kg). The engine features single or optional dual ignition, reed valve induction, free air cooling, tuned exhaust system, slide venturi-type Bing carburetors, 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 1000 produces 100 hp (75 kW), runs on premium unleaded auto fuel and has a recommended time between overhaul of 300 hours.^[1][2]

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

Data from Cliche^[1]

• Type: Four-cylinder, horizontally opposed two-stroke aircraft engine
• Displacement: 1000 cc (61.02 cu in)
• Dry weight: 145 lb (66 kg)

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

• Power output: 100 hp (75 kW)

• List of aircraft engines
• Hirth 3701
• Hirth F-30
• Rotax 912S