David, not to withdraw the joy of taching your engine, just as a supplement take the attached diagram. Text says power could be 20% more or less than shown, due to frequent modifications of this type. Unfortunately, there are no S61 data in my book (though I could offer Webra Speed .61 Racing short and long stroke and Speed LS, OPS .60 Ursus, Rossi .61 FI, Hanno).

The old (typical) Graupner propellers are out of production for at least two years. I tried to get one but to no avail (means go to fleabay). I'm not sure that Hanno used a Metterhausen prop. The list Ray presented here is a bit ambiguous, the second and third line could mean the second-placed German used a Metterhausen 3-blade 10x7. In this case, Hanno used a "no-name" 11x9. If you enlarge the picture in post #19 you'll notice that the left prop blade is labelled "Prettner", whatever that means...