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Old Feb 12, 2014, 01:35 AM
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super kupfer's Avatar
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Question
cox tee dee .09

I have a brand new cox tee dee .09

Would like to use it but worried about availability of plugs, any substitute out there???

I know for the cox .049 engine line you can get a modified head that allows you to use a OS plug.
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Old Feb 12, 2014, 06:08 AM
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Poke around here and see what you find.

http://coxengines.ca/
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Old Feb 12, 2014, 08:27 AM
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It is possible to use the .074 head. I believe it takes a regular plug. I would look for a conversion plug that takes a Turbo or Nelson type plug. I would just make one from a burned out plug when it happens, a lathe would be needed, or a friend with one. It is a bit more trouble to use the Turbo plug, but there will be no loss in performance, compared to the standard plugs.
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Old Feb 12, 2014, 11:49 AM
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Original TD .09 heads aren't hard to find at this time, and don't usually bring all that much.

I'd just collect a stash of original TD heads as you happen to find them, and then worry about a replacement head when you can no longer find originals.

An original TD 09 R/C head takes a standard short plug, as does the Queen Bee .074 head. While these heads have different part numbers, they may in fact be one in the same. For a maximum performance replacement head though, a turbo plug head would almost certainly be the way to go.
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Old Feb 12, 2014, 07:24 PM
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Quote:
Originally Posted by CafeenMan View Post
Poke around here and see what you find.

http://coxengines.ca/
Poked already there, great site.
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Old Feb 12, 2014, 07:32 PM
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Thanks for the advice guys.

I like the .074 queen bee engine head idea, hope it would fit (got to play with one of those engines when I was a teenager, a little heavy for the power).

I guess if it doesnt work then will have to use my machinist skills and make one (should be easy).
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Old Feb 12, 2014, 07:59 PM
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Yes I can confirm I own both engines. It appears you can also take a QB piston and cylinder and make a TD .074 with the 09 frame. What you may get is higher rpm than the 09.
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Old Feb 12, 2014, 08:50 PM
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Quote:
Originally Posted by Amp Abuser View Post
Yes I can confirm I own both engines. It appears you can also take a QB piston and cylinder and make a TD .074 with the 09 frame. What you may get is higher rpm than the 09.
Sweet, that's good to know.

Is the queen bee glow plug thread same as OS glow plug thread?
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Old Feb 12, 2014, 11:41 PM
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I think the crank-pin is larger on the TD 09, so although the cylinders are interchangeable (in the crank-case) you still have to do something about the conrod differences...

The QB glow plug has a standard thread, so anything will fit. The problem is the loss of power, the QB runs better with a turbo head and plug too.
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Old Feb 13, 2014, 12:20 PM
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I have flown TD 09s a lot, and really like them. Most heads last a long time if not run squeaky lean. On the other hand I have had a head burn out when the battery was attached. I gave a friend some burned out heads and he got them fixed for Nelson plugs. I found them to be about 200 rpm, and a little smoother than the stock head. I use a 2 bolt battery with about a 4 ft cord and a clothespin type glow plug attachment. I have run mine on Sig Champion 10% nitro, 20% oil, half castor, half synthetic, and Cox 7 x 3.5 prop. Release at 14,500 - 15,000.
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Old Feb 13, 2014, 03:26 PM
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Quote:
Originally Posted by Jim Thomerson View Post
I have flown TD 09s a lot, and really like them. Most heads last a long time if not run squeaky lean. On the other hand I have had a head burn out when the battery was attached. I gave a friend some burned out heads and he got them fixed for Nelson plugs. I found them to be about 200 rpm, and a little smoother than the stock head. I use a 2 bolt battery with about a 4 ft cord and a clothespin type glow plug attachment. I have run mine on Sig Champion 10% nitro, 20% oil, half castor, half synthetic, and Cox 7 x 3.5 prop. Release at 14,500 - 15,000.
Having hard time finding a 7x3.5 prop, looks like I will have to go with a 7x3.

Would love to find/try a high pitch 6" prop.
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Old Feb 20, 2014, 10:30 PM
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My brand new in the box Tee Dee .09 just got a little brother, a Tee Dee .049 (used but very good condition).
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Old Feb 23, 2014, 08:03 PM
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APC may have a 6-5 or 6-6" prop, will likely need to order them as most hobby shops don't carry them. I think they are listed as .10 pylon.
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Old Feb 24, 2014, 02:45 AM
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Yes, there are plenty of choices from both APC and Graupner when it comes high pitch 6" props. Graupner makes both 6x4 and 6x5 props.The APC 6.3x4 for instance is close to a 7x3 in terms of load.

There are very few 3.5 pitch props in these sizes, but there is one 7x3.5 by Rev-up (in wood), Brodak has had these before at least. It has nice thin blades and it is very similar to the cox 7x3.5 prop.
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Old Feb 25, 2014, 11:52 PM
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Will have to look into all these options, thanks guys.
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