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Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



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My Engine Running.

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Re: My Engine Running.

Post  1/2A Nut on Sun Oct 22, 2017 6:02 pm



AmpAbuser
Published on Oct 22, 2017

Tee Dee RC .050 - Carbon 4x4.5
Best hold peak 27,051 / .164hp / 122w / 8.5oz thrust / 115 mph
Nelson plug / aluminum carb body / pressure tap on muffler.
Carbon 5x4.5 for unloaded flying will mimic this performance safely at 28k / 120 mph.




Vs Cox High compression head:




AmpAbuser
Published on Oct 22, 2017

Cox TD RC .050 / 23,821 / High Comp Plug.
Best peak 6.7oz thrust / .113hp / 84w /102 mph

Here I show the staging of the tank first NV set and peaked but then the pressure builds up in the tank and
peaks fuel delivery creating a rich NV and I have to reset the NV again to compensate provides a jump in
power but not near as much as the Nelson plug.

Winner Nelson plug +38w more power on the top end.


Last edited by 1/2A Nut on Sun Oct 22, 2017 7:55 pm; edited 2 times in total
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Re: My Engine Running.

Post  roddie on Sun Oct 22, 2017 6:18 pm

1/2A Nut wrote:Can you double check that prop looks like a 5x3
Blade shape and prop hub looks like it.

It's most definitely a 4.75 x 4. I don't have any other 1/2A size APC props. This is the one that I sent to Ron Cribbs to run on the tach-race engines.

Regarding my vid Brad; could you please check my run rpm's with your audio-tach when you get a chance? I couldn't get a reading with my tach this afternoon. It just read 000... Laughing I'm guessing it may have peaked at close to 18K.. but my ears could be wrong.. Thanks Smile BTW.. I got the Tee Dee .09 running! The vid is in that thread.
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Re: My Engine Running.

Post  1/2A Nut on Sun Oct 22, 2017 6:31 pm

Ok wanted to double check to compute performance for you Computer Issues

Hold Static 17,038 rpm / 6.8oz thrust / .072hp / 54w / 65 mph
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Re: My Engine Running.

Post  roddie on Sun Oct 22, 2017 6:52 pm

1/2A Nut wrote:Ok wanted to double check to compute performance for you  Computer Issues

Hold Static 17,038 rpm / 6.8oz thrust / .072hp / 54w / 65 mph  

Thank You Brad! Thumbs Up
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Re: My Engine Running.

Post  MauricioB on Sun Oct 22, 2017 9:51 pm

Roddie, I'm waiting for your Tee Dee .09 video here! Very Happy
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Re: My Engine Running.

Post  getback on Mon Oct 23, 2017 9:23 am

Mauricio , It is OK i understand about the dizzies , i get them alot more than before . Those are some really nice looking models you have built in the 1986 , and the kits are very cool too . I hate you have to pay to translate our words Mad Thanks for staying in here with us Friend !! Very Happy
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Re: My Engine Running.

Post  MauricioB on Mon Oct 23, 2017 10:59 am

getback wrote:  Mauricio , It is OK i understand about the dizzies , i get them alot more than before . Those are some really nice looking models you have built in the 1986 , and the kits are very cool too . I hate you have to pay to translate our words Mad  Thanks for staying in here with us Friend !!  Very Happy

Hello Friend Eric, no, I do not pay to translate, I use a Google service that is free, has no cost, what I say is, that translations are often basic and may change some words giving even a different meaning to the phrase, but I think not that we understand each other quite well.
I like to share with you, I like to be here!
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Re: My Engine Running.

Post  getback on Mon Oct 23, 2017 6:00 pm

OK guys Thanks ,,,,, Back To Topic Good Idea Mauricio we will talk later ,, Brad that's a heck of an rpm reading with just the head conversion and what the heck is a CArbon Prop from,, i know U were using some for elect. at one time but i guess i lost count Huh...
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Re: My Engine Running.

Post  1/2A Nut on Mon Oct 23, 2017 7:39 pm

Thank you Eric, amazing results I was a bit shocked myself.

What makes it possible Galbreath / Nelson Plug of course and:

- Muffler pressure helped to feed fuel flow demand at such high rpm.

- Weight of prop helped to over come the high pitch loading

- Stiff carbon allowed the engine to harmonically sync and sing!
 the tips are actually flared up a hair helps / no flutter.

- Drag reduction, the nature of the material is very strong allowing for
 less meat at the hub with a thinner airfoil / sharper edge.

- High camber airfoil produced a ton of thrust well beyond traditional
 IC props the air blast from the 4in prop felt like a 5in standard airfoil.

10 yrs ago 100% carbon props where expensive to buy, today price
is very reasonable. The 5x4.5 would be best for unloaded field use at
around 27k.

I have used a 4.1x4.1 with no issues to 30.5k rpm, carbon / nylon prop
with a thicker foil / 5.4oz 2ch plane.




RC Plane
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Re: My Engine Running.

Post  roddie on Tue Oct 24, 2017 11:36 am

MauricioB wrote:Roddie, I'm waiting for your Tee Dee .09 video here! Very Happy

Thanks Mauricio! Here 's the vid and some statistics..

Cox Tee Dee .09 (early version)
-prop; Cox 7 x 3.5
-head; Cox std./high-compression using single gasket.
-fuel; Sig Champion "25"
-fuel tank; Perfect #8 (1.25oz.)
-run data, courtesy of Brad (1/2A Nut); Static 13,969 to 14,050 / 21oz thrust / .167hp / 125w / 47 mph (thanks Brad!  Thumbs Up  )

Thanks also to CEF members "cribbs77" (Ron) for the pair of Cox wrenches and "DCKRSN" (Bob) for the Tee Dee glow-head and 7 x 3.5 prop. Without their generous contributions, and the helpful advice from many of "you".. this engine would not be running. The red "Kwik-Klip" was given to me recently by "Ken Cook".. along with a nice fuel-bulb. Thanks again Ken!

https://www.youtube.com/watch?v=z4fr6Isu7qw

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Re: My Engine Running.

Post  1/2A Nut on Sat Oct 28, 2017 2:42 am




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Published on Oct 27, 2017

Cox TD .020 with RC Carb / 3.75x4 / 23,032 rpm / 87 mph static
.069hp /  51.47w / 87 mph / 4.6oz thrust / 25% nitro / 20% castor
Should do 29k unloaded / 110 mph

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Last edited by 1/2A Nut on Sat Oct 28, 2017 12:05 pm; edited 1 time in total
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Re: My Engine Running.

Post  getback on Sat Oct 28, 2017 8:43 am

Thanks Brad , i have always admired that little .020 Td with that big RC carb. on it ! Small Cox Logo
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Re: My Engine Running.

Post  MauricioB on Sun Oct 29, 2017 2:30 am

roddie wrote:
MauricioB wrote:Roddie, I'm waiting for your Tee Dee .09 video here! Very Happy

Thanks Mauricio! Here 's the vid and some statistics..

Cox Tee Dee .09 (early version)
-prop; Cox 7 x 3.5
-head; Cox std./high-compression using single gasket.
-fuel; Sig Champion "25"
-fuel tank; Perfect #8 (1.25oz.)
-run data, courtesy of Brad (1/2A Nut); Static 13,969 to 14,050 / 21oz thrust / .167hp / 125w / 47 mph (thanks Brad!  Thumbs Up  )

Thanks also to CEF members "cribbs77" (Ron) for the pair of Cox wrenches and "DCKRSN" (Bob) for the Tee Dee glow-head and 7 x 3.5 prop. Without their generous contributions, and the helpful advice from many of "you".. this engine would not be running. The red "Kwik-Klip" was given to me recently by "Ken Cook".. along with a nice fuel-bulb. Thanks again Ken!


Great Roddie, I still think that this Post brings together many experiences from all of us and those who join in uploading data and engines on the move, I think, is a very good reference library for many stakeholders from different parts of the world. That will enrich the forum! Thumbs Up
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Re: My Engine Running.

Post  MauricioB on Sun Oct 29, 2017 2:34 am

1/2A Nut wrote:
AmpAbuser
Published on Oct 27, 2017

Cox TD .020 with RC Carb / 3.75x4 / 23,032 rpm / 87 mph static
.069hp /  51.47w / 87 mph / 4.6oz thrust / 25% nitro / 20% castor
Should do 29k unloaded / 110 mph

Small Cox Logo



Brad!, it's a beautiful engine! Tell me, to start it, do you use the starter or do it without the spring?
It has a phenomenal march! and the carburetor works very close to the engine! Eyebrows
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Re: My Engine Running.

Post  1/2A Nut on Sun Oct 29, 2017 2:34 pm

I use the fuel bulb on the vent line to put pressure in the tank it fills the pickup line going to the carb.
When fuel is present in the carb I flip over the engine manually to prime the cylinder, "a wet condition
is felt / heard" it is ready to start. I bump start it with green Hornet starter from Sullivan fires up quickly
without much delay. I do not like using spring starters on engines with aluminum carb bodies it mares the
anodizing over time and aluminum collar. My TD .010's have aluminum carb bodies, I take exception to those
and spring start as the engine is far too delicate for the hornet starter.

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Re: My Engine Running.

Post  MauricioB on Thu Nov 02, 2017 9:51 pm

.engine brand and type: Cox Tee Dee .010
.rpm: 26900/27200 (The engine is aligned with the wind, 20 km/h and gusts of 35 km/h)
.fuel oil: 20/25/55 ricino/nitro/methanol
.type and size of the propeller: Cox .010 3 x 1.25 Competition Propeller.
.others: a) Own manufacture aluminum alloy back plate.
b) The fuel tank is made with a real bullet.


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Re: My Engine Running.

Post  roddie on Fri Nov 03, 2017 1:41 pm

MauricioB wrote:.engine brand and type: Cox Tee Dee .010
.rpm: 26900/27200 (The engine is aligned with the wind, 20 km/h and gusts of 35 km/h)
.fuel oil: 20/25/55 ricino/nitro/methanol
.type and size of the propeller: Cox .010 3 x 1.25 Competition Propeller.
.others: a) Own manufacture aluminum alloy back plate.
            b) The fuel tank is made with a real bullet.



That's just beautiful Mauricio! I love the bullet-tank!!!!
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Re: My Engine Running.

Post  MauricioB on Fri Nov 03, 2017 4:48 pm

roddie wrote:
MauricioB wrote:.engine brand and type: Cox Tee Dee .010
.rpm: 26900/27200 (The engine is aligned with the wind, 20 km/h and gusts of 35 km/h)
.fuel oil: 20/25/55 ricino/nitro/methanol
.type and size of the propeller: Cox .010 3 x 1.25 Competition Propeller.
.others: a) Own manufacture aluminum alloy back plate.
            b) The fuel tank is made with a real bullet.



That's just beautiful Mauricio! I love the bullet-tank!!!!

Thanks Roddie, here I leave some photos of approach, since in the video the measurements of rpm are not appreciated at all.


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Re: My Engine Running.

Post  balogh on Sat Nov 04, 2017 1:56 am

Hi Mauricio unfortunately the screen of your tachometer is not visible on the photos...at least when I use my smartphone to read CEF.
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Re: My Engine Running.

Post  1/2A Nut on Sat Nov 04, 2017 2:41 am

Video shows it in 480P

Here is what I see on my full screen 28" monitor
Notice the sides are black not even full screen view when
but at full screen.

Something on your settings during recording or when uploading
to Youtube perhaps?







Example of one of my vids on youtube at 1080P fill the entire screen / clarity is better too.

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Re: My Engine Running.

Post  MauricioB on Sat Nov 04, 2017 5:10 am

1/2A Nut wrote:Video shows it in 480P

Here is what I see on my full screen 28" monitor
Notice the sides are black not even full screen view when
but at full screen.

Something on your settings during recording or when uploading
to Youtube perhaps?







Example of one of my vids on youtube at 1080P fill the entire screen / clarity is better too.


Hello friend, yes, there is something about the configuration between Youtube and the camera I use that is generating this .... mmmm can I bother you Brad ?, what happens if you put your smartphone to the sound of the video, can you read the rpm? just to check ... if you want of course, I do not want to take your time ... thank you friend!
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Re: My Engine Running.

Post  MauricioB on Sat Nov 04, 2017 5:15 am

balogh wrote:Hi Mauricio unfortunately the screen of your tachometer is not visible on the photos...at least when I use my smartphone to read CEF.

Hello András, the last three photos that accuse the rpm I can see them perfectly on my screen, in the video can not see, there is a configuration issue between the camera you use and YouTube ... tell Brad if you can place your phone to the sound of the video, to check .... thanks friend for letting me know this!
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Re: My Engine Running.

Post  1/2A Nut on Sat Nov 04, 2017 5:49 am

RPM was wavering not perfectly steady so:

26,808 (mostly 26.8k range) / 31.7 mph

Brief Peak Holds:
peak 27,131
peak 27,212
Best peak 27,293 rpm / 2.46 oz thrust / .014hp / 10.4w / 32.3 mph

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Last edited by 1/2A Nut on Sat Nov 04, 2017 5:57 am; edited 2 times in total
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Re: My Engine Running.

Post  MauricioB on Sat Nov 04, 2017 5:55 am

1/2A Nut wrote:RPM was wavering not perfectly steady so:

26,808 (mostly 26.8k range) / 31.7 mph

Brief Peak Holds:
peak 27,131
peak 27,212
Best peak 27,293 rpm / 2.46 oz / .014hp / 10.4w / 32.3 mph

Small Cox Logo

Excellent Very Happy Very Happy !, thank you friend !, yes just the bursts of seeing that were about 35 km made the engine vary its status.
I have been surprised by the high rpm, this is probably due to the fact that the linear wind with the engine helped not to offer resistance (as, say, if it were flying) ... Flying
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Re: My Engine Running.

Post  1/2A Nut on Sat Nov 04, 2017 5:57 am

Thank you for the greenie!
With a stock black prop 3x1.25:




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Published on Mar 23, 2016

NANO- TD .010 / 41,985 rpm Best Pass 61 mph / Stock Prop 3x1.25
2ch / 3oz RC Plane 35% Nitro / Checked with Doppler Wave Scope


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Re: My Engine Running.

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