ORIGINAL: Konrad

This was 6.5cc class engine. The Picco of that day was a tank in weight, strength and power as I remember. The weight was rather crippling in the air, I don't know about the marine application. The K&B 6.5 was dated by the time the OS came yet could still out run it even with its rather restrictive inlet (the K&B had true ABC P&L). Did OS ever start on the road with ABC? As I recall they tried to ride the coat tails of Super Tiger with the term ''ABC type'' to masquerade their ABN liners from the very start of the aluminum ringless piston craze. In the end it was the Super Tiger 40X that was dominate.

As for nostalgia the good old days really weren't so good for this OS engine or the follow up OS40PS. Now the ringed FSR is an engine even I still like and have in my mouth balled collection. I don't know how many OS 40 VR-P I have in the bottom of my junk drawers even with the PS ABC liners as a testament to my ignorance.

I know this is RC Universe but I think it is best to use the engine in a class of competition that is NOT engine dominate, like CL aerobatics.

All the best,

Konrad

P.S.
Note the one I show is the last of its kind with the rear rotor drum.