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Cox Engine of The Month
July-2021
Kim's

"Rusty's RR-1 runs up on the Q-Tee on a beautiful Summer S.M.A.L.L. Day."




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Post  Jason_WI Fri Sep 18, 2020 1:00 am

I’m building up a RR-1 from parts I have acquired over the years. I tried to run it last weekend but it wouldn’t run only off prime. Disappointing to say the least.

I broke it down and I believe I have a reverse rotation valve. The crank pin hole is to the left when the valve opening is at the top. If this is the case I’ll need to look for a standard rotation rotary valve.

Parts built RR-1 Deb3ae10


I also had to drill out a golden bee backplate. Seems I have a fuel leak as it keeps dripping. I might need to use 2 venturi gaskets for a good seal. Drilling it out should work as I don’t see any difference between that and an original backplate.

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Parts built RR-1 3c28ad10


Original RR-1 backplate.

Parts built RR-1 C8f2be10
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Post  NEW222 Fri Sep 18, 2020 5:52 am

So this may be a stupid question, but I'll ask anyways. If you believe you have a reverse rotation valve, does that mean that they made these engines in CW and CCW rotation? Or am I simply missing something?
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Post  gkamysz Fri Sep 18, 2020 7:07 am

I agree that is a left hand drum. Try peterparisi11 on ebay, he was selling some drums this year.

RR-1 was supplied with a normal rotation drum, but left hand was available as a spare.
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Post  F4D Phantom II Fri Sep 18, 2020 8:24 pm

Hello Jason_WI
The RR-1 is a very interesting engine can you post photos of all the parts that make that engine? I would like to see the tank ,crankshaft and how the rotary valve engages the crank. Does it have a longer crank pin? Have you timed the duration of the intake? Nice project to work on.
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Post  Mark Boesen Sat Sep 19, 2020 2:36 pm

I think the 'left hand' valves were coated with black oxide? I'm pretty sure that's how LeRoy did it, drilled out.
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Post  gkamysz Sat Sep 19, 2020 3:03 pm

This is what they look like.

Parts built RR-1 Rr-111
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Post  Tee Bee Sat Sep 19, 2020 7:37 pm

Interesting!  I didn’t know there were left-hand rotors.  I wonder how it would run in reverse.
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Post  EXModelEngines Thu Sep 24, 2020 7:35 pm

I've got a handful of the standard rotation rotors that will be available soon. Let me know if you need one Jason.

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Post  Jason_WI Thu Sep 24, 2020 9:35 pm

cheers

I'll email you!
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Post  balogh Fri Sep 25, 2020 12:13 am

I have an RR1 engine whose crank pin is hollow and a small pin sitting in the hole drives the drum, not the crank pin direct.
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