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Cox Engine of The Month
September-2020
sosam117's

"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."



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Post  duaneh on Sat Dec 28, 2019 8:55 pm

I bought one of these kits shortly after they were announced, but just recently got a "round-tuit".
It's done now, so I thought I would share some impressions of the kit and pics. Don't have any in-progress pics, as I didn't plan far enough ahead to take any.

The most unusual feature of the kit is the CNC carved fuselage, which comes in a top & bottom half that just need a final sanding and glued together. Mine was cut from some very nice, light wood. The ribs, and all other shaped parts are also machine cut. The ribs each have two 1/4" square holes that the spars slide into, and function as a wing jig. This was the only area that gave me trouble. The spars were a tight fit in the holes, and fumble-fingered me managed to split 4 of the ribs trying to slide them on. After that, it went together smoothly.

I made the gear removable, since I fly over grass. I also cut the cowl into a front and rear part. The front comes off for engine access. The rear part is glued on over the tank. The tank can still be removed by sliding it out to the front. This strengthens the front of the fuse, which IMO, has a weak point at the rear of the tank bay.

I installed the Tee Dee that Fredvon4 sent me, and a homemade 3/4 oz.tank. Covered it with monokote, in a scheme similar to the Cox one, but with better colors.It actually came out lighter than expected, at 8.7 oz. ready to fly.
Southridge CNC Hyper Viper 100_1811

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Post  duaneh on Sat Dec 28, 2019 9:00 pm

Here you can see two needle valve cutouts. That way I can use a Medallion or a Tee Dee.Southridge CNC Hyper Viper 100_1814

And a look at the bottom.
Southridge CNC Hyper Viper 100_1815
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Post  Oldenginerod on Sat Dec 28, 2019 9:24 pm

Looks really nice. I hope it flies just as well.
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Post  Cribbs74 on Sat Dec 28, 2019 10:17 pm

Looks the business, how well did it balance out? The proportions are that of the original so I was wondering. The TD being light might make up the difference.

What does the homemade tank look like?

Ron

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Post  David S on Sat Dec 28, 2019 11:11 pm

You did a very nice job on this plane.It looks fast just sitting there!
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Post  Marleysky on Sat Dec 28, 2019 11:18 pm

That is a very nice looking model. You did it great!
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Post  duaneh on Sat Dec 28, 2019 11:19 pm

Ron, the homemade tank looks like a globby mess, but it doesn't leak. Just a mailbox style tank, sized to fit the available space.
Southridge CNC Hyper Viper 100_1816

Balances 5/8" back from the LE at the tip rib. Seems like a safe enough place to start.
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Post  Ken Cook on Sun Dec 29, 2019 6:30 am

The model looks terrific, best of luck with it. I love the color scheme. Ken
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Post  Dave P. on Sun Dec 29, 2019 11:37 am

Really nice work with that Monokote. That's a tough one to do, let alone do well and it looks excellent.
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Post  NEW222 on Sun Dec 29, 2019 1:19 pm

You did a great job on the plane. As others stated, also a great job on the covering as well. Looks like it is ready to take to the skies!
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Post  ian1954 on Sun Dec 29, 2019 6:33 pm

I wish I had the patience to produce a finish like this one, I hope it flies as well as it looks.
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Post  Oldenginerod on Sun Dec 29, 2019 8:56 pm

ian1954 wrote:I wish I had the patience to produce a finish like this one, I hope it flies as well as it looks.

G'day Ian. Nice to see you pop back in every once in a while.

Rod.
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