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The JPX PUL 425, also called simply the JPX 425, is a French twin-cylinder,
The JPX PUL 425, also called simply the JPX 425, is a French 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 power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of ...
aircraft engine.Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-4 Cybair Limited Publishing, 2001.
The engine was produced only until the company went out of business in the early 1990s. The company was re-formed but the engine remains out of production and unsupported for parts.
Design and development
The engine has two cylinders in a horizontally opposed configuration, with cooling fins on the cylinders. The single ignition system uses a coil and points. Fuel is metered by a single Tillotson butterfly-typecarburetor
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 ...
. Starting is by a recoil starter system with electric start as an option.
The 425 has a redline rpm of 4600 and does not use a reduction drive. Its weight of just gives the engine a high power-to-weight ratio
Power-to-weight ratio (PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measuremen ...
.
Applications
* Latécoère 225 * Lazair 2 * Lazair SS * Lazair Series III * Snipe Diamond *Zenair Zipper
The Zenair Zipper is a Canadian ultralight high-wing, single seat aircraft that was designed by Chris Heintz and produced by Zenair.
The Zipper is a highly innovative design that strongly emphasizes portability over speed or carrying capacit ...
Specifications (425)
See also
References
{{JPX Air-cooled aircraft piston engines Two-stroke aircraft piston engines