I have a Cermark .40 F-20, with a long pipe Rossi 45 in
it. I have a flat pack battery mounted up against the rear bulkhead, at the tail cone to balance it.
If you don't want to spring for a new motor....get a pipe
for your .40, prop it down....and run the snot out of it.
I'm not sure if you could cram the .61 in it....but I think you
will have more fun with it....with the .40. If you really want
it to haul....you'll have to get a high perf. motor....
Dave.
