wrote:
On Feb 14, 9:07 am, Karl-Heinz Künzel
wrote:

Under "Bilder" on the left you will see details of the engine.

KH
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Note the excellent method used for belt tensioning.

-R.S.Hoover

I looked for it but didn't see it. Was it an eccentric shaft mount on
the driven wheel? Those planes looked like Fournier RF4s at fist
glance. Yummy!

BrianW