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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  rdw777 Mon Mar 14, 2022 2:25 pm

Silver QRC 035a8110
Silver QRC C9768910
Silver QRC 090acd10

I decided to overhaul a QRC I won ebay a few years ago….After rebuild I ran three tanks thru it rich….. It seemed happy at the rich setting at about 11K…. Fourth run leaned out to 13.5 K, About like the info online indicates…. Using a Cox 6-3 and Glow Plug Boy 24…. This was with a standard glow plug, The one that came on it, Also using three head gaskets as indicated by the instructions for break in I found online….Runs about three minutes…. Wished it would go a bit longer…. Maybe with a little more run time?

Not the strongest of Cox .049s but unique with its muffler which does a pretty good job….Just a little more trouble to prime….Nice to get oily hands agin, Never thought I would have missed that  Smile
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Post  rdw777 Mon Mar 14, 2022 2:37 pm

Silver QRC 7ff07710
Silver QRC 195ba010

When I was looking for information on it online it was mostly to do with QRC’s with red tank and blue spinner but I ran into a post by rsv Bob, Looks like the plain ones were for rtf Cox airplanes, Belated thanks Bob!! Also an advertisement that hints at dating….

Also I want to thank Ken Cook for a past post that I saved on sealing tanks for Bee type engines, Those help tremendously to provide steady runs ….

Robert
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Post  Cribbs74 Mon Mar 14, 2022 3:09 pm

Robert,

What is the number on the cylinder? QRC should be #6 or not numbered , 2 bypass and no SPI. Also should have a 1702 head on it.

If it’s just a regular bee with a muffler on it then those tach readings sound correct. If it is a number 6 cylinder then put the TD head on it. I would also recommend a 5x3, but depends on your plans for it. What fuel? 1 gasket for every 10% nitro. So if 25 percent 3 gaskets 20% 2 gaskets etc. it’s a wag really, but you can add or subtract gaskets until you see the best performance.

Ron
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Post  rdw777 Mon Mar 14, 2022 3:36 pm

Silver QRC A99e0a10

It has a mark on it but I can’t tell much from it…. Yes, dual bypass and no SPI…. Also no taper or very little in the cylinder…. Also no 1702 head, Just standard….

If I do anything with it maybe a simple 2 channel RC…. I’m shopping on outerzone to see what might be interesting….. The muffler is appealing because there’s a chance I could fly about one mile from home…. Closest RC field is about 1-1/2 hrs away
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Post  crankbndr Mon Mar 14, 2022 6:48 pm

With standard head and 24% run one head gasket, should pick up some rpm. Not sure about run time. These engines require very little
break-in.
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