Long Harlequin 933 Explained

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^{[1] [2] [3]}

Applications

• Long Longster

Engines on display

• Eagles Mere Aircraft Museum ^[4]

Dart Airport Museum in Mayville NY

Oregon Aviation Historical Society Cottage Grove Oregon

Glen Curtis MuseumHammondsport, New York

Two other examples known in private collections

Notes and References

1. Air Progress. Winter 1969. The Plane That Helped Save Homebuilding.
2. Popular Aviation. November 1935. Some remarkable experiments in lightplane performance.
3. 1933 Flying Manual (Mechanix Illustrated).
4. Web site: Eagles Mere aircraft museum. 7 October 2013.