The well-known marine outboard engines have been adapted and converted for sport and experimental aviation. It is Kiekhaeffer (see).

-The Mercury of 40, 60 and 80 HP have been the main ones that were adapted for aviation. They are water-cooled.

-A 28 HP (Mercury 25XD) was installed on the experimental Lyle Forsgreen. See EAA reports on 1984 Oshkosh.

-Maybe the 80 HP Mercury "800" is the luckiest. This 2-stroke engine was used on the Spratt.

-Kiekhaeffer (see) adopts a Mercury 80 HP being downgraded to 56 HP on a DelMar DH2 helicopter. It was a horizontally-opposed 6-cylinder engine.

From Appendix 9: In a small experimental helicopter at the PAC, at the SBD airport (BCN) we found an adapted outboard Mercury engine.

"Three-cylinder vertical engine"

“Magnetic plate-flywheel”

-This is a 2-stroke engine with three carburetors and three ignition coils. The flywheel has a ring gear for electric starting. It appears to have an alternator-starter system. The truth is that this device has been built by RE Phelon Co, of Mass. USA.

"The engine seen from the other side"

-The engine is water cooled.