Hi Dick
I can not find out where i have seen your old post on Roto 25 and Funtana 90[

]. Could you give us a short story about that combo?
total weight?
tuned pipe performance?
RPM with 18x8, 17x8?
Should i modify the engine box to support vibrations ?
Would it be possible to hide the pipe under the fuse by building a balsa box over the pipe?
Can it hover at 50% throttle[>:]
thanks
Daniel