Yep, that are the diagrams I was thinking about. Note the longstroke 61 Racing was not intended to rev more than 13.5K.
The Arrow of Wolfgang Matt would be perfect match for this 61R short stroke - a low drag design which deserves to be flown fast. Matt´s Saphir has totally different character and asks for the long stroke powerplant, in my humble opinion.

The 80F was told to have less elaborate mass balancing of the crankshaft, conrod and piston - due to be of massively overbored design. Even the tungsten carbide counterweigths in the crankshaft web were not fully able to cure this. This engine won´t feel weel at higher rpm.

Webra closed doors? That is a shame, didn´t know that.