Guys,

Thanks for all your excellent suggestions and happy new year!

Bo, thanks for reminding me of the good match between the Saphir and the Webra. Mine is not the long stroke version but I see no problem with using the short stroke on the model. Webra specs actually mention that power output between the two versions is identical.

Thanks also for reminding me of that thread. Since August I actually have bought a Model Tech Saphir I ARC. Given the model is readily available for me to build, I may just go with your suggestion. Besides, the Calypso with the ST X61 I'm building and the Saphir with the Webra 61R will make a nice pair.

The only question remaining is how well these un-pumped engines will perform in their inverted installation.

All other excellent suggestions may have to wait. The Speeda for the Speed 80 does sound mighty tempting. Will have to inquire with Don as to the state of his core cutting for the various fuses he has molded.

David.