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

"Cox Tee Dee .051 RC Marine"



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Kingpin, I said I wasn't going to build it... Empty Kingpin, I said I wasn't going to build it...

Post  duaneh Thu Feb 01, 2024 1:48 pm

After reading the Scientific Kingpin thread and looking over the “plans”, I decided to pass. I didn't care for the hammerheaded look of the cowled engine on a profile fuselage, and the wing mounting method seemed suspect.
But after giving it some thought, all the issues seemed fixable. I decided to go ahead, but to build it a little differently. I made 3 changes.
1. Extended the fuse profile to the nose and used a side mounted engine. Also slightly changed the vertical tail shape.
2. Made a full wing slot in the fuse, and sheeted the wing center section. The wing then mounts the same as any profile.
3. The kit wing has a straight LE and a tapered TE. I simply made it into a 'Hershey Bar' wing and added fixed flaps to give the taper.

The actual size of the original is uncertain due to plan inaccuracies. I decided to disregard this, and press on as if they were correct. The span came out to 14-1/2”, length to 14”. Weighs 3.3 oz. Power is a PeeWee with a drilled tank. (Not by me!)  The trim is like the boxtop. For colors, I tried to match the decals pictured in RSV1cox's thread.

Kingpin, I said I wasn't going to build it... 100_5016
Kingpin, I said I wasn't going to build it... 100_5017
Kingpin, I said I wasn't going to build it... 100_5018
Kingpin, I said I wasn't going to build it... 100_5019


Last edited by duaneh on Thu Feb 01, 2024 11:21 pm; edited 1 time in total
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Post  rsv1cox Thu Feb 01, 2024 3:11 pm

Wow, and you turned that out in..........less than a month? Amazing.

You are the master of the side mount engine which works great on this model and a method that I employed on my P-38 build X2.

I love the paint scheme when brought to life in color.

Kingpin, I said I wasn't going to build it... P1017076
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Post  944_Jim Thu Feb 01, 2024 8:45 pm

DuaneH knocked it out of the park...again!

How did you do the lettering and scallop job?

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Post  balogh Fri Feb 02, 2024 3:17 am

That is a beautifully made and finished lil bird, congratulations!
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Post  akjgardner Fri Feb 02, 2024 4:46 am

Very nice job , absolutely love the color scheme
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Post  GallopingGhostler Fri Feb 02, 2024 7:43 am

Nice variation @duaneh , changes are practical but still meets the original intent, should fly well. Thumbs Up sunny Beer Cheers I Love This Forum!

By the way, excellent craftsmanship, a real head turner! Cool

Scientific had a habit of modifying their kit designs over time to reduce the cost of manufacturing. Example, they retained the original photos on Little Bipe and Little Devil, but the later versions deviated slightly in looks from the original design. I imagine that this could account for differences in the .020 Kinpin over time as well.
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Post  duaneh Fri Feb 02, 2024 9:49 am

Glad you guys like it!
Jim, for the lettering, I typed  into MS Word, then played with fonts and size until I got what I wanted. Then printed and cut the letters from Monokote. The resulting stencil is used for positioning.
Kingpin, I said I wasn't going to build it... 100_5021

The tail scallops are monokote cut directly from the plan, using a penny as a cutting guide. Wing scallops were redrawn and cut freehand from the plan. I fudged the spacing slightly so that the scallops would fall on rib locations. Makes it a little easier to avoid wrinkles.
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Post  GallopingGhostler Fri Feb 02, 2024 12:16 pm

Good methodology for the lettering, Duane, thanks for sharing.

Regarding one less scallop in the wing trim, perhaps the original photo had an extra wing rib? That is what comes across my mind with Scientific kit changes over time.
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Post  Mike1484 Fri Feb 02, 2024 1:17 pm

Another home run duaneh. Seeing a new plane posted here always brighten up the day. Thanks for posting your Kingpin.

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Post  duaneh Fri Feb 02, 2024 3:17 pm

GallopingGhostler wrote:Regarding one less scallop in the wing trim, perhaps the original photo had an extra wing rib? That is what comes across my mind with Scientific kit changes over time.

My rib spacing is different from the kit because of the change to the wing center section. The first rib moves outboard about an inch to support the sheeting, then the others are evenly spaced from it.
Kingpin, I said I wasn't going to build it... 100_5022
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Post  rdw777 Fri Feb 02, 2024 5:20 pm

The finish is beautiful with the bright trim….Excellent build too….. Would love to see that one in the air!…
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