** Please Note: No more information has been found by the Compiler than is given here from Bill Gunston's book on Piston Engines (BGP). The companies and their engines are included for completeness and the hope that someone may come up with additional material.**
Icarus Aviation of Australia built this horizontally-opposed engine, but nothing is known beyond what is listed below (BGP).
O-20 (2-Stroke) -- {N/A / N/A / 19.5} / {N/A / N/A / 320}
2cyl; Icarus Skylark II; 24hp@5200rpm; 1981-1985; Wt = 31#.
Geared to N/A by a toothed-belt PSRU.
BGP.
Applications: None found.
Butterly Co. of Belgium built this horizontally-opposed engine, but nothing is known beyond what is listed below (BGP).
O-17 (2-Stroke) -- {N/A / N/A / 16.7} / {N/A / N/A / 274}
2cyl; Butterfly JCV; 22hp@6800rpm; 1981-1985; Wt = N/A.
BGP.
Applications: None found.