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Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Babe_b10
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"Tee Dee .010 r/c"


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Cox .01 /.02 /.05 /.09 Engines Speed Planes

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  gkamysz on Sat Apr 13, 2019 10:11 am

Ah, I found it. I fixed the rule but had to check the box to update existing listings.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Mon Apr 15, 2019 3:05 am

Old Bugger
Gap between TD .15 crank pin and backplate is in the clear when pressed with a electric starter.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9613

Recap of the TD .15 note the weight variances followed up with a comparison to the nylon engine mount.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9618

Comparing the parts swap out weight savings with the radial mount.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9620
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Last edited by 1/2A Nut on Mon Apr 15, 2019 10:44 am; edited 7 times in total
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  gkamysz on Mon Apr 15, 2019 8:00 am

The OEM backplate weighs 5.8g and this one weighs 8.9g. So that's +3.1g, now subtract the mount at 13.3g and it's -10.2g not counting removing the lugs which is another -2.2g so total 12.4g or .5oz less. That adds up!
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Post  1/2A Nut on Mon Apr 15, 2019 10:50 am

Yes very true, 12.4g on the nose of the plane makes a big difference with the CG for .10 to .15 size planes.

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Post  1/2A Nut on Wed Apr 17, 2019 5:10 am

TD .020 Tuned pipe would need to be 7.75" from header coupler to stinger.
Engine is imposed into the foreground and is not to scale.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9621

Can do in three pieces if need be.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 S-l16015

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  aspeed on Wed Apr 17, 2019 10:44 am

Proportionately it would look about right, but I wonder if it is too short. The F2A speed pipes for a .15 are a fair bit longer, and they are running around the same RPMs, around 40,000. They mostly have interchangeable tailpieces of different diameters for fine tuning. TBH, I have not seen one for a few years and don't know the exact dimensions. I would think that length with a smaller diameter would be close to ideal, or a good starting point. What kind of pipe parts did you scare up there? Looks interesting.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Wed Apr 17, 2019 5:09 pm

Here closer to scale:
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9622

7.75 plus the distance to the center of the piston.
1675 WS x 140 ET / 7"  = 35k


TD .020 has hit these numbers;

All carbon 3x3
Best Static 30,684 / 87 mph / Per Prop Calc.

Best pass 37,304 rpm
Doppler Reading best pass 107 mph down wind.

3.5 x 3.5
Doppler Reading 105 mph down wind
Best pass 30,742 rpm

3.37 x 4.5N Prop
Best pass 28,585 rpm / 122 mph down wind.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  gkamysz on Wed Apr 17, 2019 9:15 pm

I saw that listing and noted how that pipe was built. It would be an expensive pipe.
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Post  1/2A Nut on Wed Apr 17, 2019 10:09 pm

Yes fancy pipe AC-29 engine with the tune pipe made by Cyclon out of  Russia.

Alberto is selling the setup: $385
https://www.ebay.com/itm/Speed-Engine-AC-29-with-tune-pipe/323774503905?hash=item4b6276dbe1:g:H4EAAOSw7Khcr3yQ

Given the size for the TD .020 this would be more feasible, say around $65 bucks a pop would be worth it. I am down for
3 of them! 2 for projects 1 for bench testing engines / props. Manifold and header would be a steal at $80 considering the
micro engine cool factor.

Have you already sent the final round of testing for the plug adapters?

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  aspeed on Wed Apr 17, 2019 11:01 pm

That .29 is tempting. A BB OS is almost that much, and not anywhere near the technology. Too bad it's the last one. No parts when stuff breaks.
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