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JR servo reversing extension

Old 02-23-2014, 08:55 AM
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CESSNA 421
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Default JR servo reversing extension

I am needing to reverse one of my standard rotation JR DS8611A servos and someone told me about a servo reversing extension. If I can't obtain one of the extensions I will have to internally reverse the servo electrically. If anyone know of such a product please let me know.

Thanks,

Mike
Old 02-23-2014, 10:12 AM
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speedracerntrixie
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Mike, what kind of setup do you have that won't allow you to reverse the servo via TX? All of these reversing extensions I have ever seen mess with the servos centering and the center usually drifts with temp changes.
Old 02-23-2014, 12:30 PM
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CESSNA 421
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I am using dual elevator servos and one of them has to rotate opposite of the other. I am using a match box and so a reversing Y is not acceptable. I definitely do not wish to slave another channel so it looks like the only thing I can do is to internally rewire the servo for reverse rotation. JR used to make a DS8611A reversed servo but they are now discontinued.

Thanks,

Mike
Old 02-23-2014, 12:44 PM
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OldScaleGuy
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These work fine. http://www.maxxprod.com/mpi/mpi-5.html#Reversers
Old 02-23-2014, 02:07 PM
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Mike, you can reverse one servo through the matchbox.
Old 02-23-2014, 03:15 PM
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tailskid
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I used two MatchBox's on my Slipstream RV-8; one for flaps and the other for elevator servos...needed both and they worked flawlessly.
Old 02-23-2014, 08:11 PM
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CESSNA 421
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According to Horizon Hobby my JR match boxes do not have reversing capabilities as does the Futaba match boxes.

Mike
Old 02-23-2014, 08:22 PM
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Mike unless they changed the Matchboxes the Horizon CSR you spoke with is wrong. Check the instructions under functions. You can set the rotary dial to settings 5 through 8 and use the inc/ de buttons to reverse the servo.
Old 02-24-2014, 03:09 AM
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Thanks, I will check it out.

Mike
Old 02-24-2014, 06:42 AM
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airega1
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matchboxes WILL reverse a servo
Originally Posted by CESSNA 421
Thanks, I will check it out.

Mike
Old 02-24-2014, 07:00 AM
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Matchboxes will reverse a servo. That's exactly the case they are for, setting up dual elevators where you need to reverse one servo and match throws or the like.

Spektrum/JR recommends AGAINST using any kind of reversing or amplified Y or extension with the DSM based 2.4 systems as well
Old 02-24-2014, 10:30 AM
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What kind of transmitter are you using? Both my DX-8 and 9303 allow me to configure duel elevator servos in the transmitter and then I have no need for a matchbox. You set both channels up separate and they work off the elevator stick. Do not just mix 2 channel or you'll lose the trim function on one channel.
Old 02-24-2014, 12:47 PM
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Tony Iannucelli
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You might be able to "mate" the servos in the transmitter depending on your setup. Mixing sometimes does not allow dual trim. Mating does. Hope you figure it out. Some of this stuff is vexing.
Old 02-24-2014, 01:00 PM
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flycatch
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Simple solution if you have the skills' and tools is to reverse the leads directly on the servo motor.

Last edited by flycatch; 02-24-2014 at 01:01 PM. Reason: Spelling
Old 02-24-2014, 01:30 PM
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speedracerntrixie
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Originally Posted by flycatch
Simple solution if you have the skills' and tools is to reverse the leads directly on the servo motor.
I believe the 8611a servo has the motor surface mounted onto the PCB making this impossible.

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