The Arrow 250 is a family of
single-cylinder
A single-cylinder engine, sometimes called a thumper, is a piston engine with one cylinder. This engine is often used for motorcycles, motor scooters, motorized bicycles, go-karts, all-terrain vehicles, radio-controlled vehicles, power tools an ...
,
two-stroke
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft in contrast to a four-stroke engine which re ...
, 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. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbin ...
s that were designed for
ultralight aircraft
Ultralight aviation (called microlight aviation in some countries) is the flying of lightweight, 1- or 2-seat fixed-wing aircraft. Some countries differentiate between weight-shift control and Aircraft flight control system, conventional three-a ...
by
Arrow SNC of
Italy
Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
.
[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 250 is a conventional single-cylinder engine that weighs only . The engine features single- or optional dual-ignition,
reed valve
Reed valves are a type of check valve which restrict the flow of fluids to a single direction, opening and closing under changing pressure on each face. Modern versions often consist of flexible metal or composite materials (fiberglass or carbo ...
induction, free
air cooling
Air cooling is a method of dissipating heat. It works by expanding the surface area or increasing the flow of air over the object to be cooled, or both. An example of the former is to add cooling fins to the surface of the object, either by maki ...
, tuned exhaust system, a slide venturi-type Bing
carburetor
A carburetor (also spelled carburettor or carburetter)
is a device used by a gasoline 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 Ventu ...
,
fuel pump
A Fuel pump is a component used in many liquid-fuelled engines (such as petrol/gasoline or diesel engines) to transfer the fuel from the fuel tank to the device where it is mixed with the intake air (such as the carburetor or fuel inject ...
,
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 was initially developed to allow W ...
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 ripcord , ''pull start'', or ''rewind start'') is a method of starting an internal combustion engine, usually on small machines, such as lawn mowers, chainsaws, grass trimmers, ultralight aircraft, small outboard mot ...
.
The tuned exhaust supplied with the engine has been criticized as "cumbersome" and needing modification to fit most aircraft.
Variants
;250
:Gasoline aircraft engine, . Out of production.
;270 AC
:Gasoline aircraft engine, at 6800 rpm, weight with carburetor, alternator, fuel pump and starter. Out of production.
Specifications (Arrow 250)
See also
References
{{Arrow SNC
Arrow SNC engines
Air-cooled aircraft piston engines
Two-stroke aircraft piston engines