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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

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TD .051 RC SPEED Empty TD .051 RC SPEED

Post  TD ABUSER Mon Nov 02, 2020 7:47 am

I got the itch to build a TD .051 powered speed plane.
Make the plane as small, light and low drag as practical.
Control it with "Park Flyer" sized radio gear.
I bought a NIB engine for $85 shipped and it has turned out to be a good one. Probably an early model ..?
With a 5 x 3 rubber Cox prop it does 22,000 on 22% nitro
With a 4.2 x 4 APC / Nelson plug it does 25,000 with ease.
The wing is solid balsa sheet 1/4" thick with a full span 1/8" x 1/4" poplar spar
Covering on the wing is tinted cellophane, Towerkote film on the fuselage.
The wing is roughly 120 sq inch with 30 inch span.
The cowl is a few layers of  FG cloth applied with medium CA over a blue foam form [aka "plug"]
Use a latex glove finger to spread the CA into the cloth. It takes very little CA to saturate the fibers. Sand before applying the next layer. This is a quick method for making small parts.TD .051 RC SPEED Img_0213
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Post  davidll1984 Mon Nov 02, 2020 9:01 am

??? No ruder ??? How it afect flight speed ?? Nice models Thumbs Up
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Post  TD ABUSER Mon Nov 02, 2020 9:11 pm

@davidll1984 wrote:??? No ruder  ??? How it afect flight speed ?? Nice models  Thumbs Up

Thanks for reminding me about the rudder...! Very Happy
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Post  getback Tue Nov 03, 2020 6:50 am

That should move out Good TD Abusher RC Plane Rudder = Drag
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Post  TD ABUSER Tue Nov 03, 2020 2:38 pm

@getback wrote:That should move out Good TD Abusher RC Plane  Rudder = Drag

Let's say the engine might hit 27,000 rpm with a 4 pitch prop. The mathematical speed is 105 mph.
So I'll look at that speed as "Ground Zero". If the plane flies that speed or faster, The Designer did a good job. If not, then The Designer's pencils get taken away from him and he is demoted to "Shop Maintenance Tech".
One thing I see here is it's a nice looking wing on an ugly fuselage. There's always room for improvement.
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TD .051 RC SPEED Empty A VERY WEAK UPDATE

Post  TD ABUSER Sat Nov 07, 2020 7:32 pm

Well I got 3 flights in today at a field where the owner of the 10 acre hay field recently moved.
He's the same guy I bought a rusted out Datsun 280Z from about 5 years ago. I overpaid for that "basket case / rust bucket" so I didn't feel too guilty about using his hay field today for 1/2 hour today.
The plane flies just like a "speed plane" or a pylon plane should. The generous amount of span makes it very stable and the "fore / aft moments" are plenty stable too.
The only problem is the plane was very slow today. It might be a little bit nose heavy...just a wee bit. The glide is what I would call "urgent to land".
I did not provide the engine with a hole in the cowl above the velocity stack. I think it might be a good idea to do that now.
It wasn't running fast enough to bother with video, but it was fun to fly RC again after so many years have gone by.TD .051 RC SPEED Img_0217
TD .051 RC SPEED Img_0216
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