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Help with something I have never seen

Old 07-16-2012, 10:41 AM
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goirish
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Default Help with something I have never seen

I put dual servos in my wing. Both arms on the servo facing out towards the tip of the wing. When I operate the right stick, both servo operate in the same direction, like flaps. Any suggestions. Using a DX7 with no mixes. I am using a Y-connection
Old 07-16-2012, 10:47 AM
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Mr67Stang
 
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Default RE: Help with something I have never seen

Hey GoIrish, we need a little more info. Do you have the servos on a Y-harness or are they plugged into seperate channels of the Rx. If it's the second option, which channels? Are the servo's orientated the same (output shafts both towards the trailing edge of the wing or both to the leading edge?) If they are not the same, that's the problem.

EDIT// slow reader today, I just saw where you say it's on a Y-harness. Look at my last statement then.

Another possability is you have a reversing Y-harness. Take a picture of it and post it if the servo orientation checks out.
Old 07-16-2012, 10:50 AM
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goirish
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Default RE: Help with something I have never seen


ORIGINAL: Mr67Stang

Hey GoIrish, we need a little more info. Do you have the servos on a Y-harness or are they plugged into seperate channels of the Rx. If it's the second option, which channels? Are the servo's orientated the same (output shafts both towards the trailing edge of the wing or both to the leading edge? If they are not the same, that's the problem.
Using a Y-harness. both servo arms are facing outbound. both servos are mounted so the output shafts are closest to the TE. Actually like all of my other planes.

Old 07-16-2012, 10:53 AM
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Default RE: Help with something I have never seen

Is it possible you have a reversing Y-harness then? These are used for elevators and wings with 2 servos for 1 aileron.
Old 07-16-2012, 10:57 AM
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Default RE: Help with something I have never seen

Two rare posibilities;
-your Y harnes is really a reversing Y harnes. made to do just what its doing to drive two elevator servos the same way.
- you've gotten a very rare wired the wrong way servo. In the old days of RC you could get "reversed" servos. Don't know if this standard has faided out.

Those are the only two explanations for what you have.

Try one different servo and see if anything changes. If not swap out the Y harnes
Old 07-16-2012, 10:59 AM
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Default RE: Help with something I have never seen

Good point. I forgot about reversed servos.
Old 07-16-2012, 11:12 AM
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Default RE: Help with something I have never seen



That problem is eaasy to fix.
Take one of the servos and turn it upside down so the arm is going the opisite way.

Old 07-16-2012, 11:12 AM
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goirish
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Default RE: Help with something I have never seen

That is exactly what it was.  I changed one servo at a time and when I replaced the second one it worked the way it should.  I will mark the odd servo so I know not to put it in another wing.  Thanks for all the help.
Old 07-16-2012, 11:19 AM
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Default RE: Help with something I have never seen

Wonderful hobby, every so often it even has curveballs thrown in for fun.

Glad you found the problem.
Old 07-16-2012, 12:25 PM
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noveldoc
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Default RE: Help with something I have never seen

Interesting.  The reversed servo will be great if you ever do flaps.

Tom
Old 07-16-2012, 12:28 PM
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Rodney
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Default RE: Help with something I have never seen

Different brands of servos rotate in different directions; for instance HiTec and Futaba turn in opposite directions. For ailerons always use the same brand of servos when you have a separate servo for each aileron.
Old 07-16-2012, 06:26 PM
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goirish
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Default RE: Help with something I have never seen

both servos were the same brand. Had me stumped.  I done enough wings that I am pretty sure I was doing it right.
Old 07-17-2012, 11:41 AM
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Default RE: Help with something I have never seen


ORIGINAL: goirish

both servos were the same brand. Had me stumped. I done enough wings that I am pretty sure I was doing it right.
Take both of those servos and put them aside as a matched set.

You can use them for dual flaps as noted, or for elevators that require a servo for each half.

Don't use one and save the other as you'll get uneven wear and regret having wasted a matched pair.

Reversed servos with matching normal servos are getting very hard to find, and they are quite useful when you need them.

You're better off buying another pair for your wing.

Old 07-17-2012, 11:44 AM
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goirish
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Default RE: Help with something I have never seen

I robbed Peter to pay Paul on the servos.  I have ordered some more, but took some off of another plane so I could fly this weekend.  These on going on my Tug so we can put on a glider tow demonstration at our club meeting this coming Saturday.
Old 07-17-2012, 07:43 PM
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Default RE: Help with something I have never seen

Are these digital programmable servos by chance?

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