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Olympic 15 or Rear venturi motors Babe_b10
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Cox Engine of The Month
October-2020
Jason_WI's

"Pieces and parts RR-1. New crank, rotary valve, and drive plate. Early #1 cylinder. Drilled out golden bee backplate. Battle hardened crankcase and tank."



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Olympic 15 or Rear venturi motors Empty Olympic 15 or Rear venturi motors

Post  Iceberg on Thu Oct 08, 2020 8:11 am

I have never had a rear draft rotary motor like the Olympic 15 or other. I am curious what the crank shaft looks like to achieve its operation. I can't seem to find a schematic or picture of the crankshaft. Does anyone have a disassembled one or picture of the crank?

Thanks
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Olympic 15 or Rear venturi motors Empty Re: Olympic 15 or Rear venturi motors

Post  Jason_WI on Thu Oct 08, 2020 9:13 am

Just like a RR-1 it has an extension on the crank pin to drive the drum valve.

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Olympic 15 or Rear venturi motors E4774210
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Post  davidll1984 on Thu Oct 08, 2020 9:48 am

Nice part Thumbs Up
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Post  Iceberg on Thu Oct 08, 2020 10:09 am

Thanks for the pictures! The four different holes in the drum. If different holes are used does differnt timing and or performance result?
Thanks
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Post  ffkiwi on Sat Oct 10, 2020 4:11 pm

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

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