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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Dude needle Thread  Td 049 and Babe bee 049 Empty Dude needle Thread Td 049 and Babe bee 049

Post  andreshulais Fri Mar 26, 2021 9:35 am

Dear Friends:

1)What is the thread in needle in td 049?

2)What is the thread in needle in babe bee 049?

Thanks!!!
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Post  Marleysky Sat Mar 27, 2021 1:00 am

andreshulais wrote:Dear Friends:

1)What is the thread in needle in td 049?

2)What is the thread in needle in babe bee 049?

Thanks!!!

Im gonna go out on a limb and take a  semi informed guess at the answers:
The TD049 uses the fine thread 128 TPI
The BB 049 uses the standard  72 TPI.  

But, now I question myself because the TD also can use the Kirn kraft or Ace “Fine Thread” needle valve when using bladder pressure?
Tired w/ Coffee Read

First correction.   Its 80 tpi  and 128tpi  from this thread:
https://www.coxengineforum.com/t14970-fine-thread-needle-conversion#195815
Dude needle Thread  Td 049 and Babe bee 049 3e6cdc10


Last edited by Marleysky on Sat Mar 27, 2021 1:06 am; edited 1 time in total (Reason for editing : More info)
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Post  coxaddict Sat Mar 27, 2021 6:05 am

The Babe Bee, TD, Sure Start and Medallion all use 80 Threads per inch.  The difference is in the diameter and taper of the needle
Dude needle Thread  Td 049 and Babe bee 049 P3260112
The Babe Bee needle screws into the TD Valve body but will it work?
Dude needle Thread  Td 049 and Babe bee 049 P3260110
The Sure Start needle works in the Medallion
Dude needle Thread  Td 049 and Babe bee 049 P3260111
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Post  getback Sat Mar 27, 2021 7:23 am

[quote="The Babe Bee needle screws into the TD Valve body but will it work?" I don't think it will from the look of the pointed end . Huh...
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Post  andreshulais Sat Mar 27, 2021 11:36 am

Thanks....!


any dude more.....what are the different diameters?
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Post  coxaddict Sat Mar 27, 2021 4:32 pm

TD and Babe Bee needle diameter same,@ .108 ". Needle is just posed for picture
Dude needle Thread  Td 049 and Babe bee 049 P3260114
Sure Start and Medallion needle diameter same @ .0835"  
The Medallion needle shown in the picture was modified by brazing a handle to it
Dude needle Thread  Td 049 and Babe bee 049 P3260115
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Post  andreshulais Sun Mar 28, 2021 7:58 am

great! thanks!

nice day
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Post  aspeed Sun Mar 28, 2021 1:19 pm

Just for anyone that may care, the nominal OD (outside diameter) of a #2 thread (2-56, 2-80 or whatever) is .086" . The nominal for a #4 thread (4-40, 4-80) is .112". The actual measurement is generally about .002" less than nominal and the tolerance is different on the class of fit. GH2, GH3 or whatever is desired. There are charts with all the boring details of this, and even more boring charts for military specs which are mostly the same.
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