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Post  Levent Suberk on Mon Mar 23, 2020 1:58 pm

Are these flexible needle valves available for Cox engines? What are the advantages and disadvantages?

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Post  Marleysky on Mon Mar 23, 2020 2:19 pm

#1 Advantage (IMHO) is getting your fingers away from spinning prop.
#2 would be the extra length to get outside the cowling.

I have some WenMac/Testors NV with braided wire “flex” cable, do not recall seeing anything like them from Cox, other than pushing flex fuel tubing over nV.
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Post  aspeed on Mon Mar 23, 2020 3:52 pm

I've never seen one for a Cox. Besides the obvious advantage, I like the short ones best, like the Russian combat motors. They won't get bent, and are lighter. I've seen the long ones vibrate like crazy at certain rpms. Having said that, the OS have a sleeve that you can put in a piece of wire for an extension. It tightens with a set screw. I have used a piece of leadout wire with a wheel collar for a knob to adjust from outside the cowl. A Cox needle could be cut off a bit and a sleeve with two set screws used to add an extension. If there is just a little nub sticking out, then a crash would only bend the flexible portion. Not something I would do normally.
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Post  Jason_WI on Mon Mar 23, 2020 4:20 pm

There is a flexible needle valve used on one of the Cox cars back in the day. I have one and I think there is a picture of one in the Cox engine handbook.
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Post  getback on Tue Mar 24, 2020 5:56 am

Never seen one and guess they were not a add on (individually packaged ) Don't have a book , but you would think it been brought up before ? Shamrock Easter Bunny
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Post  Jason_WI on Tue Mar 24, 2020 9:54 am

#45 in the picture.

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Post  getback on Tue Mar 24, 2020 10:34 am

Thanks , That just makes me want one for some reason LOL St.Pats Beers
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Post  Marleysky on Tue Mar 24, 2020 10:39 am

getback wrote:Thanks , That just makes me want one for some reason LOL St.Pats Beers
Yes! Thanks Jason for the picture. Something “new” to watch for on engine/parts searches.
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Post  NEW222 on Tue Mar 24, 2020 4:16 pm

Thank you for teh picture Jason. Very interesting. Never knew that there were that many needle valves for these engines.
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Post  Marleysky on Wed Mar 25, 2020 5:21 pm

Here’s a picture of a flex needle valve installed:

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