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General control line discussion => Open Forum => Topic started by: Bootlegger on October 23, 2012, 12:40:24 PM
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I installed a turnbuckle in a 1/4" pushrod in a 740 Bucaneer to have adjustability, now I don't know how to tell which end is left and which is right.
Any suggestions as to how to get this info?
When I make adjustment's it goes so slow I can't tell which way it ia going!!
Thanks a lot...
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Put marks on the rod, measure it, and then give it some turns. Measure again. Then comes the hard part - remembering which way it goes.
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Right hand threads lean left and left hand threads lean right.
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So, you have left and right dies? The rod is threaded LH and RH?
OK,
Figure the direction on twist that advances by laying the rod across the palm of our hand, so your fingers wrap in the direction that will advance towards your thumb. If you use the right hand to get this correct, the threads are right handed. If you use your left hand the threads are left handed.
Another way to do the same thing is with a nut on the rod lay the rod across the RIGHT palm with the end and your thumb in the same direction. Turn the nut in the manner your fingers curl around the rod or bolt, so from palm to fingertip direction. If the nut advances to your thumb it is right handed, if the nut advances away from your thumb the threads are left handed.
If this still confuses you look up the "right hand rule" with regards to vector math.
Phil
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Phil, the bad part is that the turn buckle is installed in the fuselage of the model, I have a hatch in the inboard side to have access to it.
I don't think I'll ever do this again...
Thanks for all the advice...
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Why make it so hard. Center the controls. Mark where surfaces are at in relation to each other. Turn the turnbuckle one way and see which way the surfaces moved. If wrong way turn the turnbuckle the other way past where you started. Just like adjusting surfaces on the twiddly stick planes. Except I was told to adjust further than your wanted to see if it did m ake a difference. If it made the right difference and was too much just back up a bit. But, with the radio planes the weather and length of pushrods made a difference on if you needed to adjust of not for plain ole sport flying.
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Problem of using a turnbuckle, as in full-size planes: the turnbuckle can turn, which will change the setting, one way or the other. You would have to safety-wire it, and this seems difficult inside of the "small" end of the fuselage, behind a little trap door!
Floyd
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Gil,
I used one of the Hangar 9 titanium right hand/left hand fittings for this purpose---I was very surprized one day to find it broken and being held together by only the jam nut I had used to prevent it from turning. It was on a profile model; had it been inside a built-up fuse it probably would have caused a "major malfunction"..........
Jim