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"Cox Tee Dee .010"



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Tee Dee .049/.051 tuned pipe?

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Help! Tee Dee .049/.051 tuned pipe?

Post  duke.johnson on Fri Jul 31, 2015 12:47 pm

I'm currently in the plannig stages of a Tee Dee .049 hydroplane project. The project is in need of a tuned pipe exhast system. I've searched CEF for info and found a thread stated by Ken, but the pictures are not linked to the thread anymore. Anyone have pictures or info of a tuned pipe? Preformance results? Know where I can find one or how to make one?

I have some friends who race boats and they think this is a good project, but think the little engine needs a pipe.
Thanks
Guys
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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  Jason_WI on Fri Jul 31, 2015 1:06 pm

There was a guy selling carbon fiber tuned pipes on ebay a while back for Cox. I don't have a link to the seller though. You might be able to make one from a Cox GTP Nissan Maples throttle exhaust collector and then need to just find a small tuned pipe and couple with silicone tubing.

http://coxengines.ca/cox/www.mh-aerotools.de/airfoils/javapipe_en.htm

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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  Admin on Fri Jul 31, 2015 4:13 pm

Awhile back Servimg (which is owned by the company that hosts this forum) had a problem where pictures were lost. I used Google image search to bring up some of the missing pictures (which I replaced on the thread). Ken would have to reupload the rest of them though https://www.coxengineforum.com/t2096-tee-dee-049-on-a-pipe

Check out this thread. http://www.rcgroups.com/forums/showthread.php?t=2391197

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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  balogh on Sat Aug 01, 2015 12:07 am

Look for the topic Tee Dee Performance crank where in the later threads 1/2Anut and I discuss tuned pipes.
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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  1/2A Nut on Sat Aug 01, 2015 12:51 am

http://www.rcuniverse.com/forum/speed-rc-nitro-boats-117/8498373-1-2a-size-dumas-boat-club.html






Small Cox Logo

Using Sportwerks header etc for high performance Non SPI  .05 car engines.
Starting post #163 I push through to the next level
http://www.rcgroups.com/forums/showthread.php?t=1499068&page=11
My SPI AP .061 has done very well hitting 99.4mph.

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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  1/2A Nut on Sun Aug 02, 2015 3:38 pm

You can take a candle stick reshape to the size pipe you want and pull carbon sock over per this pic. Once the resin is cured just heat up with a hot air gun and let the wax drip out the header pipe side into a throw away paper cup.

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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  dinsdale on Sun Aug 02, 2015 9:13 pm

1/2A Nut wrote:You can take a candle stick reshape to the size pipe you want and pull carbon sock over per this pic. Once the resin is cured just heat up with a hot air gun and let the wax drip out the header pipe side into a throw away paper cup.

Now that's clever!! I like that idea. So simple yet so good.
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Help! Re: Tee Dee .049/.051 tuned pipe?

Post  1/2A Nut on Sun Aug 02, 2015 11:06 pm

Yes just use high heat resin / hardener the pipe gets oil spray inside actually helps keep things cooler. You can fabricate a
separate header / sleeve over the cox cylinder set up to block one exhaust port. Take note not to use an SPI cylinder.
I haven't made one myself but about 5 months back I bought two sizes in the carbon sock out of Canada before the shipping
prices went through the roof. I want to fabricate a 7in pipe for the TD .020. For .049 engines you need 11in from the
start of the stinger to the piston face. You want to use a silicon coupler so you can adjust at the header to tune the
engine to the prop. 22.5k static tuned to 25k in the air is the max you can go to safe guard the ball socket and rod. Providing
you are not pulling around a heavy plane. If the plane is more than 16oz you can not exceed 24k without risk to the engine.
Ideal target range for a piped 1/2A is 8oz to 12oz RTF.
Now for boat use the loads are different. You can needle to 25k static use a RC carb as throttle is an absolute must with boats.
When starting up you want to keep the rpm down till it hits the water and rap small metal tube around the head for water cooling.

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Help! Re: Tee Dee .049/.051 tuned pipe?

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