Thanks for the link.

When we bought the moter including the C160 silencer also an additional piece pipe came with it. If you then add the length between the middle of the moter and the first plate in the silencer the total length is about 64 cm (25.2" ). All is then tuned for about 9000 RPM. However our planes do not allow this length so now it is shorter. We did not do exact RPM measurements to this date. Tomorrow at the field i will do a measurement. I will post the results.

Kind regards, Jan