os 40 sr
 

i have found an old 40 sr i would like to know if any one has had some expiance with this engine and what power should it give me?
Laurence

RE: os 40 sr
 

The true SR was the very first which was a rear induction engine made for RC pylon and C/L rat race. This then morphed into a front induction for sport flying and became the FSR (presumably the F meant front induction) but kept the same crankcase so the SR cast under the exhaust port stayed. They were all originally ringed engines (both Dykes and a normal single ring) then eventually became what OS called ABC but was actually ABN.

Almost everyone says the FSR was the best engine OS ever made. Except me, I go for the VF series then the FSR :)

RE: os 40 sr
 

the problem with my fsr is that it is fairly power less as much as a 40 fp it is giveing me the same performance maybe a 100 revs more

Laurence