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"cox 049 gasoline"

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

Post  1/2A Nut on Sun Apr 21, 2019 8:28 am

Tested with a P4 plug KamTechnik turbo plug adapter and a new prop APC made for 1/2A:  4.4x4
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9623



Published on Apr 20, 2019
Best Peak 23,498 rpm / 9.2oz thrust / 89 mph pitch speed
.140hp - 104.4w / weight with oil spray 8.8oz / APC 4.4x4
KamTechnik Turbo Plug Adapter / OS Gold P4 turbo plug
Average rpm 22.5k rpm / 86 mph pitch speed.
Will need to unload to 28k to get better use of the pipe.
106 mph pitch speed + with the 4.4x4
Carbon HQ 4x4.5N prop for speed runs est. 138 mph / 32.5k

Tried no pressure tap as an ole wise owl said he gets better
low end idle with no pressure tap when using a RC carb and
pipe combo with TD engines. I was willing to give it a go with
the P4 plug which on it's own should help hold a good idle it
worked fine and gives me some comfort when I go to fly it.
So will see how things go in the air, will set a bit rich at 22k rpm
to compensate for a thirsty unloaded rpm.

The new APC prop is impressive offering a good amount of thrust and
pitch speed can recommend says made for CL planes.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9413
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Lp042210
Good weight at 3.9g with attention to rpm via thin tips.
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Post  getback on Sun Apr 21, 2019 9:23 am

Are the plug adaptors still in testing ? i know you had said before they may bee offered at one time . Small Cox Logo Easter Bunny Small Cox Logo
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Sun Apr 21, 2019 9:55 am

Yes last round of testing is in the mail go back a page you will see some 2nd round testing those findings
have gained a conclusions for the final compression ratio.

Passed ready to go for: Cox .049, .05, .051. includes .049 and .061 Norvel engines.
This adapter has performed just as well as Galbreath adapters for the Nelson plug.

3rd and final round of testing coming up for these two displacements we are very close to perfect!

Current 2nd round testing for Cox 4.5x2:
.020 / 17.72k (looking for 18k or better)
G Mark .030 / 21,237 rpm  (22k)

Odds are good you may see turbo adapters for:
.074 /.09 and .15 engines

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Post  getback on Sun Apr 21, 2019 10:09 am

Alrighty then , good deal thanks Brad ! Small Cox Logo Cant Resist The Bunn
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Post  1/2A Nut on Sat Apr 27, 2019 11:32 am

Doing a follow up on the TD .15 mount I put a muffler on to reduce noise and
did a bench test to see how well the engine vibrations translated to the radial
mount. I used two screws to hold it down and rotated the cylinder to snug up
the mount to the crank case. Vibrations to the board was low seemed like a
solid setup to a very powerful TD .15 Special (aluminum piston / with pin)
The needled was set to steady top end no effort to max out the rpm with a
APC 7x5 / 25% nitro / 20% castor. I had the spring steel band closed off to
reduce noise, was surprised it made this much power quite the beast!
Checked two reviews on this one claimed peak .47 hp

The muffler was still in the package before I slapped it on, the fit was not so good
loose enough to rotate around per pic while the engine was running and leaking black
aluminum / oil out the seat.

Needs a quality manifold / header to control the goo with a good seal, paid $25.40
on a ebay bid good enough for bench testing but not worth using with a project.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Vlcsna19
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9624
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 S-l16016
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9625

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

Post  getback on Sun Apr 28, 2019 9:07 am

That's good to hear about the mount not so about the muffler ! I wonder what it would have did with the restriter opened up ? Was the review with the same prop Pitch / style , seeing you gained some HP ? Flying
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Post  1/2A Nut on Sun Apr 28, 2019 5:22 pm

Thank you Eric, reviews where done using older prop designs vs modern APC prop and
glow plug adapter with a med heat plug.

I have done a test with a throttle sleeve but did not mess with the NV ran out of time.
The entire board was moving forward, I had to lay an arm down on it to keep in place aborted mission
after sub 15 seconds. The new test the muffler was bearable on the ears and I had a weight on the board.
I now have a slide throttle installed.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Cox_te10

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

Post  1/2A Nut Today at 3:17 am

Recap current 2nd round testing Cox 4.5x2:

- TD .020 / 17.72k / 5.65oz thrust (looking for 18k +)

- G Mark .030 / 21,237 rpm / 8.5oz thrust (looking for same or better)
The .03 adapter was modified on my end and hit 21.24k
Amazing power, blows away a TD .020 truly fitting between
a .049 and .02 displacements. Perfect if you have a .020
size plane needing more power.


Prepping for round 3 and I do think this will be the
passing round for the .03 and .02 displacements.
The 3rd generation turbo plug adapters are in / will use the
same engines / same props and fuel. Note some changes
the wrench slots have doubled in case you mare one set
or if the wrench is best fit base on your position to the
engine or turbo plug seating. Both have excellent compression
after assembly.

Will fire them up this week and get some power data!
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9816
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9815
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9814

A side note while waiting for the 3rd gen plug adapters:
I reworked a APC 4.2x2 added some backcut to the blades and feathered in a new trailing edge.
Here are the results a whooping 6.73oz of thrust using a G-Mark .03 carb it is quite the beast.
Tested with the 2nd gen modified turbo plug adapter.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 24 Imag9817
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