Olympic 15 or Rear venturi motors

Nice part

Thanks for the pictures! The four different holes in the drum. If different holes are used does differnt timing and or performance result?
Thanks
Ice

Just for the record=the Olympic (and Sportsman) 15s were normally REED valve-the ones shown above by Jason were special development models done by Bill Atwood -there were IIRC about 50 produced...and farmed out to various top fliers for assessment...I think a couple were even used by US team members at the FF WCs in 1959 or 60. The knowledge gained on intake porting helped develop the Tee Dee range. The earlier standard reed valve Olympic was quite an outstanding performer in its day (1959-60) but suffers from a lack of suction-which makes tank positioning quite critical...the less powerful Sportsman is much better in this respect-having both a smaller venturi and a different reed geometry....and consequently stuck around a bit longer-Martin Hepperle's site lists it as being around from 1958-1966: http://www.mh-aerotools.de/airfoils/cox_frameset.htm

ChrisM
'ffkiwi'