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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  James clive Wed Jul 21, 2021 10:24 am

About to run my killer bee clone with red backplate before mounting
Measured clearance between intake and my steel test stand
Came up with 008 sounds too close to me contacted bernie who assured me cox made these in there tens of millions with no problem mounted an ran
22.200 rpm being a non believer made a 1 mm spacer plate from aluminium
Sheet ran again the result 22.200 rpm bernie was right
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Post  Yabby Fri Jul 23, 2021 1:52 am

Hi James clive,

I have several of those backplates and have never used them as i also thought more gap would be needed and that maybe i would need to make a firewall with a hole in it. I never really asked anyone either way, ut now that you have done so, and tested, I will get mine out and give them a go! Thumbs Up

Thanks.

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Post  NEW222 Fri Jul 23, 2021 2:39 am

However, if used on a wooden backplate, when tightened down, it may squish some and make less that a .008 gap.
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Post  Cribbs74 Fri Jul 23, 2021 7:01 am

On wood hand crafted test stands I have taken a small chisel and created a scooped out channel. It’s not needed though as seen above. I just like the idea of knowing than induction is not a variable when sorting problems.

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Post  James clive Fri Jul 23, 2021 8:29 am

Reply to new 222 & cribbs74
An easy way to preserve correct intake clearance whether tank or
Backplate mounted is to cut a piece of 1 mm aluminium Sheet
Screw this to the firewall with 4 small self trappers then drill & secure
With 4 servo screws into the timber firewall hope this helps
Have done it many times never a failure
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