The Arrow 500 is a twin-cylinder,
horizontally opposed
A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, wh ...
,
two-stroke
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a Thermodynamic power cycle, power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being comple ...
, single or dual ignition,
aircraft engine
An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...
that was designed for
ultralight aircraft by
Arrow SNC
Arrow SNC was an Italian aircraft engine Aerospace manufacturing, manufacturer based in Piacenza. The company specialized in the design and manufacture of two-stroke engines for ultralight and homebuilt aircraft. The company is no longer in bus ...
of
Italy
Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
.
[Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-1 Cybair Limited Publishing, 2001. ][Purdy, Don: ''AeroCrafter - Homebuilt Aircraft Sourcebook'', page 70. BAI Communications. ]
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.
Arrow engines are no longer in production.
Development
The 500 is a conventional twin-cylinder engine that weighs . The engine features single or optional dual ignition, reed valve induction, free air cooling, tuned exhaust system, a single slide venturi-type Bing
carburetor
A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meteri ...
, fuel pump,
Nikasil
Nikasil is a trademarked electrodeposited lipophilic nickel matrix silicon carbide coating for engine components, mainly piston engine cylinder liners.
Development
Nikasil was introduced by Mahle in 1967, and initially developed to allow Wanke ...
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
Rope start (also called pull start or ''rewind start'') is a method of starting an internal combustion engine, usually on small machines, such as lawn mowers, chainsaws, ultralight aircraft, small outboard motors and portable engine-generators. ...
.
The 500 produces , runs on premium unleaded auto fuel and has a recommended
time between overhaul
Time between overhauls (abbreviated as TBO or TBOH) is the manufacturer's recommended number of running hours or calendar time before an aircraft engine or other component requires overhaul.
On rotorcraft, many components have recommended or man ...
of 400 hours.
The tuned exhaust supplied with the engine has been criticized as "cumbersome" and needing modification to fit most aircraft.
Specifications (Arrow 500)
See also
References
{{Arrow SNC
Arrow SNC engines
Air-cooled aircraft piston engines
Two-stroke aircraft piston engines