Long Harlequin 933

The Long Harlequin is a two-cylinder horizontally opposed aircraft engine.

Design and development
The Harlequin engine was developed as a replacement to the Heath-Henderson B-4 engine used on the Long Henderson Longster homebuilt aircraft. The cylinders were based on a 74 cubic inch Harley Davidson JD Engine with connecting rods from Continental built Star auto engine. The builder was expected to machine their own crankshaft, Les Long cast and sold crankcases

Applications

 * Long Longster

Engines on display
Dart Airport Museum in Mayville NY
 * Eagles Mere Aircraft Museum

Oregon Aviation Historical Society Cottage Grove Oregon

Two other examples known in private collections