Speed,Combat,Scale,Racing > Carrier
OS MAX .65 VR DF engine work for class II
bill bischoff:
In the late 90's, I set one up for Dale Gleason for "modern" Class II. His was the earlier disc valve intake instead of the drum valve intake. This allowed us to assemble it "wrong" so it would run backwards. It was set up for suction with some version of 61 front intake carb.(stock timing) On 50% nitro and an APC 10x6 pusher prop, high speed was usually in the 17sec. range. It was not as fast with the 10x7 or 10x8 APC's.
Dennis Holler:
In looking at the old Peter Chin evaluation from a magazine in the 80's they show the exh duration of 165 degrees, I can paste the article file if that will help. I'm not sure where that falls in the open versus pipe or tuned pipe range.
C.T. Schaefer:
That motor is very strong and very heavy. One of our guys used one successfully 'back in the day'. Glo plugs were cheap then so 70-10-20 was the bomb. The speed guys around here liked them too. I would definitely recommend an exhaust valve. We used to use the K&B marine valve. Crankcase pressure is best with a carb but can be tricky to set up. 10x8 - 11x8 wood prop. TS
If you get it rocking it may want to pull you off your feet. In the olden days (70's-80's) we would regularly run 15-16 sec TS
Paul Smith:
As reported in the NCS HLL newsletter, Terry Heron recently did a high speed of 14.86 (121 MPH) with what I assume to his father's OPS powered Judy. Maybe he built a new one. I don't know. Either way, it's a lot of speed for a scale model plane.
Hide behind a van.
bill bischoff:
Same engine, third version airplane. It was indeed awesome.
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