Sometimes Koenig

In the 1990s König Motorenbau made two-stroke, radial engines with 3 and 4 cylinders in geared and gearless versions, for ULM.

“SC-430, gearless”

-The gearless SC-430 with electric starter has 3 radial cylinders and gives 24 CV. It displaces 430 cc.

“SC-430 front schematic drawing”

-The SD-570 is a 4-cylinder radial or "X-4" that gave 28 CV with a displacement of 570 cc.

“SD-570 side schematic drawing”

-It had two cylinders at the front and two at the rear, possibly the crankshaft had two crankpin journals.

-The major model is the SF-930, a 4-cylinder in "X" as well. It came out in 1985. Its displacement was 930 cc. and it gave 48 CV at 4,000 rpm.

“SD-570, front”

”SF-930”

-König had 4-stroke engines under study.

From Appendix 12: Below we show a new color photo of the 3 cylinder radial.

“3-cylinder engine for ULM”

-It has belt-reduction gear, an electric starter, and single ignition although it has one coil for each cylinder (spark plug).