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Cox Engine of The Month
June-2022
balogh's

"COX Tee Dee .051 on duty"



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Post  Ken Cook Sun Jun 19, 2022 6:52 pm

This has been a troublesome build. My son started it and built most of it and then tired of it. He just said for me to complete it which I shrugged a bit but grew fond of it quickly. Converting rubber to glow is always problematic as many areas not addressed in the initial kit need to be beefed up. In the case of this kit, the entire front from F-1 -F-5 has been sheeted and a new plywood firewall made to accept the engine. Guillows provided some crap vinyl stuff that they said is equal to or as good as plywood. Sheeting this was extremely difficult, many compound curves. This plane has two triangular shaped bulges on the sides which are also radiused. This was real fun. I don't use CA glues so there were times I needed to hold the model for several minutes until the glue tacked up.

            Landing gear struts were replaced with 1/8" bass as well as wing struts. Sheeting had to be installed wherever penetrations went through the wings such as struts. I used medium silkspan to cover the model and fuse which also presented challenges as well. The stab in the picture is clear with a dye that I've been using in my clear. This is what offered the amber color which is exactly what I will be doing the entire model in. No paint on this one other than clear due to weight issues.

          Power will be a Spitzy .045 on a eyedropper tank. I'm shooting to have this completed by the weekend of July 9. Our club and another club from New Jersey is having a large event which includes a swap meet and clown racing not too mention other fun time flying events. I have a few other free flight planes I recently completed to hopefully and successfully fly on that day.

Morse Scout update Dscn3060

Morse Scout update Dscn3061    All sheeting was 1/32" doped and covered with silkspan
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Post  706jim Sun Jun 19, 2022 9:25 pm

I built.one of these around 1971. Pretty sure the plans said you could power it with the Pee Wee 0.020.

From my experience it will NOT fly with this engine. Firewall is simply too large to get any meaningful thrust out of this engine with its small diameter propeller.

It did fly ok when powered by a Golden Bee and converted to control line.
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Post  rdw777 Mon Jun 20, 2022 7:15 am

Just something about a well built stick and rag model that is pleasing to the eye… Classic Very Happy …. Love the color on the stab… I’ve used a strong brew of tea to stain balsa to give it a similar color and vintage look…. Mating it up to a Spitzy is nice… 1/2A Old Timer!…. More photos as you are able please…
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Post  andrew Mon Jun 20, 2022 9:17 am

Ken --
What dye are you using to color your clear with?
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Post  Ken Cook Mon Jun 20, 2022 3:00 pm

The manufacturer of the dye is Castin Craft. It's called transparent resin dye for epoxy and polyester resins. I have 6 colors, this is the first I used. I came across it from some free flight builders. It takes a few coats but I like it.
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Post  GallopingGhostler Mon Jun 20, 2022 3:43 pm

Really nice framing and covering work of that classic Guillow's bipe, Ken. With sheeting the nose front reminds me of my Sterling M series F/F style "auto-magic" C/L stick and tissue SE-5 WW2 bipe with Pee Wee, covered in silkspan.

Yes, Cox little 4.5x2 prop would struggle to get the wind past that huge round cowel. I'd think a 6x2 prop would probably be the ticket. The humble Pee Wee is a torquer, with a decently flat torque curve.

Late Joe Wagner on one of his planes, forgot which, used a 7x2 prop on a Pee Wee. I've got some of those rare ancient Plastikote wood props, haven't run a static try on the bench yet to see if holds water.

Amazing, things done back then out-of-box to make things work.

Ancient Little Spitzy .045 and the Scout's decent wing area ought to do it a lot of justice, I'd think it is a good match.
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Post  andrew Mon Jun 20, 2022 4:39 pm

Thanks for the resin dye info!
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