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03-06-2012, 06:07 PM | #11 |
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Re: Strange servo behavior help
Unplug one servo at a time and try each by it self. Then try a different servo on each side. Try getting the antenna wire outside the fuse as quickly as possible.
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03-06-2012, 10:32 PM | #12 |
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Re: Strange servo behavior help / solution found
Hi Guys; There is just nothing like a night of trouble shooting and going through the process of elimination. Thanks for the input and a number of PM suggestions that I got. Nobody got it right, including me.
It was a bad 8" servo extension factory made. Figure that one out. I double checked with other servos, battery packs, and a different receiver and that's what it was. Strange behavior caused by a faulty servo extension. End of mystery. There are no short cuts when it comes to trouble shooting, it's just the slow process of elimination. Everything is working perfect now and I will have a lot more confidence flying this summer. New fuel lines, new clunk line, new battery pack, all connections double checked and I recentered my one servo arm. I did the old antifreeze job on the exhaust too. Everything is just like new again.
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03-06-2012, 10:59 PM | #13 |
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Re: Strange servo behavior help / solution found
The only thing I can think of a faulty extension causing this sort of problem is if there was so much resistance the voltage and/or current present at the servo was far below optimum. You never mentioned it, but was that servo also a lot slower than the other aileron?
One extra point on older systems is that sitting with the battery connected for an extended time can create what is called "Black Wire Disease". This only happens if charge is present in the pack and occurs due to electron transfer in the conductor material and can be equally prevalent in the wire conductor itself or the internals in the switch). Since your switch only interrupts the positive side of the circuit the negative, black side remains connected to the battery. For extended storage the only solution is to disconnect the battery, (that does not prevent it occurring in the battery lead itself). Very old batteries may show voltage, but corrosion can prevent full current flow. Glad you found the problem, but I would recommend you take a good look at any other extensions since unless you found some physical fault with the one mentioned, (such as a cut wire) they may be borderline, as well.
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03-07-2012, 05:24 AM | #14 |
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Re: Strange servo behavior help / solution found
Glad you got it figured out and it was an easy fix, John.
I have had one servo extension, one Y harness and two switches fail over the years. One would think the simple parts should be fool proof, but I guess not.
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03-07-2012, 07:58 AM | #15 |
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Re: Strange servo behavior help / solution found
I never would have guessed the extension.
is it the simple type of extension or the fancy type with the small heat-shrunk circuit board in the center of the extension?
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03-07-2012, 09:17 AM | #16 |
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Re: Strange servo behavior help / solution found
It was just a plain old extension from the rx to the wing bay to plug the one wing aileron in to.
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03-07-2012, 03:51 PM | #17 |
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Re: Strange servo behavior help / solution found
Well John, atleast it happened on the hanger floor.
Bill
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03-07-2012, 04:38 PM | #18 |
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Re: Strange servo behavior help
It may not be gone yet JKovacs!
Charge that 6v pack up and try it again. A friend of mine had that same problem once when he went to a 6v pack on older servos. It seems that the extra voltage made the servo motor & gear train faster that the electronic so the servos would overshoot a control input & have to correct back. In this case all the controls were doing it just some worse than others. The fix was to go back to 4.8 volts & everything was fine.
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03-07-2012, 06:32 PM | #19 |
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Re: Strange servo behavior help / solution found
I have found this problem mainly with Futaba servos, Hitec not so much.
Bill
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03-07-2012, 06:53 PM | #20 |
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Re: Strange servo behavior help / solution found
It was JR as I recall.
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