Needle valve extension... - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-14-2016, 07:45 PM   #1
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Needle valve extension...

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Does anyone have a better way of extending a Saito needle valve other than the short piece of wire flattened on one side then fixed with the needle set screw? (I find these often prone to coming loose.....) Please PM...
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Old 06-14-2016, 08:44 PM   #2
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Re: Needle valve extension...

I got a plane from a swap meet, and he put in a couple of inches of braided pushrod/cable with a wheel collar on the end. The set screw was replaced with a bolt. It looks ok, and works well.
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Old 06-14-2016, 09:14 PM   #3
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Re: Needle valve extension...

The post above sounds like the new OS extension. I use a 1/16" solid brass rod. Its soft enough that the set screw in the needle valve will really get it tight. I make it the length I want and put a 90 degree bend on the end for a better grip. I also shrink wrap the end. I've never had one come loose. The one in the picture is a used one so its not as straight as it should be. Cheers Floyd
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Old 06-14-2016, 09:18 PM   #4
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Re: Needle valve extension...

Along with the bent wire which is as simple as it gets, (never had one come loose) I've used a couple of other methods.

One was an allan head cap bolt to allow for a ball end driver to reach down through the top of the cowl and another was the joystick pulled from a broken controller. That had a much smaller diameter pin where it was inserted into the plastic trunnion. The serrated end looked pretty neat sitting flush with the cowl and allowed for easy thumb adjustment

Both these required drilling the hole in the end of the needle larger but there is enough material to tolerate it and still use the lock screw.

On the subject of the allan head bolt another option is to drill the hole larger and tap it to size. Once the bolt is threaded in you can lock it with the set screw and I doubt it would ever come loose.

One issue is keeping the weight down as vibrations can otherwise wear out the needle and seat.
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Old 06-14-2016, 09:25 PM   #5
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Re: Needle valve extension...

I've used the braided throttle cable too but I soldered the cable lightly......the screw really grabs and holds onto the solder. The other end, I just use a small wheel collar.

I've also used a t-pin and thread locked the screw in.....never lost one of those either.

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Old 06-18-2016, 09:25 AM   #6
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Re: Needle valve extension...

I use the cap screw method often but I solder a short length of copper tube over the head of the cap screw to guide the Allen driver, The brass tube could be long enough to just reach the canopy (but not through) to allow the canopy to be removed without removing the needle.
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