On Feb 14, 2:00*pm, Brian Whatcott wrote:

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!

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Yes. You can see it in one of the engine photos. The eccentricity
appears to be machined into the shaft. That is, a diameter of about
2" from which the shaft stub projects off-center. This method is
probably the most common, dating back to the Stewart PSRU. But the
problem has always been adequate CLAMPING of the eccentric, which this
PSRU appears to have resolved through the use of TWO clamping plates,
as shown in one of the photos. There's some very good Practical
Engineering here.

-R.S.Hoover