wire for high speed needle?
10-27-2005, 04:51 AM
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wire for high speed needle?
hello guys!
could some one tell me the size rod that i can make or allen wrench
size to fit into the hole in the high speed needle with the set screw in
it. any little tricks that you guys use? also what about the low speed
what did you fab so you can adjust them with out taking off the cowl
every time to adjust them? thank you
could some one tell me the size rod that i can make or allen wrench
size to fit into the hole in the high speed needle with the set screw in
it. any little tricks that you guys use? also what about the low speed
what did you fab so you can adjust them with out taking off the cowl
every time to adjust them? thank you
10-27-2005, 06:15 AM
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RE: wire for high speed needle?
I just use a scrap piece of 2-56 push rod. Bend it in an "L" shape. Grind a flat spot on it for the set screw to bite in. Run it out through a hole in the cowl. For the low speed I cut a small hole in the cowl in line with it and use a small srewdriver to do the adjusting. Not very high tech but it works.
10-27-2005, 12:15 PM
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RE: wire for high speed needle?
i do it a bit differnt as i do not like wires protuding from my scale models if i can help it.this is a carry over from setting up my ducted fans as any long wire is subject to a sonic type vibration.i cut the head off an allen bolt and siver soder it to the needle valve,low speed i do not bother with as once set i have vever had to adjust it again,if i have a low speed problem i start looking at fuel tubing,tank ,etc.then to adjust i just use one of the dubro ball drivers that goes thru a hole in the cowl in line with the needle..if the needle valve has an o ring on it remove it before using silver solder as it uses higher temp than lead/tin type solders
10-27-2005, 12:30 PM
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RE: wire for high speed needle?
I don't use a wire either. Like sbd-5 I also use a an allen head bolt but I use the whole bolt. My method is to run a 4-40 bottoming tap into the hole in the end of the needle valve where the music wire goes. Some engines you can just tap, others need drilled larger first. I then put a 4-40 hex head bolt into the tapped hole with RED loctite. I can then adjust the needle with a ball driver with a LONG handle. I use this for both cowled and non-cowled installations for both 2 and 4 stroke engines. Normally, I cut the bolt so it fits tight against the needle valve.
I like the fact I can adjust the needle with a long handled ball driver. Works great on non-cowled setups and you can angle the driver a little back from the prop arc at the same time.
Just my (another) method.
Dan
I like the fact I can adjust the needle with a long handled ball driver. Works great on non-cowled setups and you can angle the driver a little back from the prop arc at the same time.
Just my (another) method.
Dan
10-27-2005, 01:27 PM
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RE: wire for high speed needle?
And old 0.050" (or the like) allen key / hex driver, the one in teh box that's all 'rounded off' & don't fit wheel collars anymore..
10-27-2005, 09:08 PM
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RE: wire for high speed needle?
I also do like dant and sbd . If you take a 2-56 hex socket screw and grind down some of the thread, it will fit snugly in the hole and the set screw will tighten against it. Then you can just use a ball-ended hex wrench to make adjustments. I also take a small piece of brass tubing, glue it to a standoff on the firewall that aligns it with the setscrew and a small hole in the cowl. Then when you stick the wrench in the hole, the brass tube guides it straight to the screw, no hunting around. Use tubing just big enough for the shaft of the wrench. All you have is a tiny hole in the cowl, and when you have to take the cowl off for service, etc., there's nothing in the way. Here's pics of two separate setups:
