Flying S
The engine was cold - worst case. What normally happens is the following
1.Too much charge is put into the pots ( throttle fully open )
2.Engine fires - the explosion in the pots is so great that the the piston whistles too quickly down the barrel.
3. Due to xs speed everything is momentarily elongated
4. This causes the big end to take a scoop out of the white metal bearing - the metal normally found in the scavege filter after an overspeed.
5. Usually the driveshaft remains intact
Most overspeeds are usually not that bad because
a) the erpm needle leads the engine quite considerably
b) engine is reasonably robust
c) if engine is warm there is a protective coating of oil everywhere.
Generally the 300 is a great little ship they will take the abuse that an R22 will not tolerate. Bear in mind one was designed as a military trainer trhe other as a 1 + 1 personal transport machine.