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Need retract servo wiring help

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Old 03-07-2013, 05:02 AM
  #1
skillet92
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Default Need retract servo wiring help

Ok guys i have 2 jr 791 retract servos that i am putting in a h9 150 mustang. They only work off of 4.8 and i am going to run life batts for the reciever. How can i run a separate 4.8 nimh for the retracts and still connect them to the reciever?
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Old 03-07-2013, 05:31 AM
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Default RE: Need retract servo wiring help

Try this. This image came from RCU several years ago. Don't remember who should get credit for it.

You can add a Y at the retract servo point in the graphic to go to both retracts.
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Old 03-07-2013, 06:11 AM
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skillet92
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Default RE: Need retract servo wiring help

WOW! Thank you. That is excactly what i am looking for.
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Old 03-07-2013, 06:31 AM
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Default RE: Need retract servo wiring help

Or you can get a step down diode like we use for tail rotor servos and ignitions.
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Old 03-07-2013, 06:53 AM
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Default RE: Need retract servo wiring help

I have found that the Smartfly regulators are a great solution to this issue. They have both adjustable voltage versions and preset (like 6v) ones. High quality and modular so if you change things out the regulator can be easily removed.

Whit
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Old 03-07-2013, 06:56 AM
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Default RE: Need retract servo wiring help

That was my first choice till a fellow club member told me that if the retract jams opening or closing it will drain the reciever battery quickly. He was the one that suggested i run them off a separate batt. But i could not understand excactly what he meant. The diagram clears it up for me.
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Old 03-07-2013, 07:07 AM
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Default RE: Need retract servo wiring help

Good point, I'm only using air driven systems so I had not considered that.

whit

Quote:
ORIGINAL: skillet92

That was my first choice till a fellow club member told me that if the retract jams opening or closing it will drain the reciever battery quickly. He was the one that suggested i run them off a separate batt. But i could not understand excactly what he meant. The diagram clears it up for me.
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Old 03-07-2013, 07:56 AM
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Default RE: Need retract servo wiring help


Quote:
ORIGINAL: wphilb

Good point, I'm only using air driven systems so I had not considered that.

whit

Quote:
ORIGINAL: skillet92

That was my first choice till a fellow club member told me that if the retract jams opening or closing it will drain the reciever battery quickly. He was the one that suggested i run them off a separate batt. But i could not understand excactly what he meant. The diagram clears it up for me.
Electric retracts don't automatically do that if they jam. The advertising of the ones I've purchased explains why they don't.
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Old 03-07-2013, 08:09 AM
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Default RE: Need retract servo wiring help

Rock i have down and locked retracts on 3 of my planed and yes they dont jam and drain the battery because of built in overload protection and will still try to go the other direction if you need them to, but on this h9 150 mustang i am going to try and set it up with the factory retracts and us jrs 791 retract servo. They will jam and might not stop draining the battery if they do. Of course with that much torque they might also distroy themselves. Lol
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Old 03-07-2013, 09:45 AM
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Default RE: Need retract servo wiring help

Mike,

I'm not sure if this is an option for you but you might be able to run them thru a JR Matchbox if possible and then that would be just like a Y-harrness but it would give you the opportunity to run a separate 4.8 volt battery thru the match box to power just the two servos. And still only use one channel in your receiver. Or you could run the two servos thru this dual output voltage regulator from Spektrum also and not have to worry about adding anymore weight to the plane.
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Old 03-07-2013, 08:19 PM
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Default RE: Need retract servo wiring help


Quote:
ORIGINAL: wphilb

I have found that the Smartfly regulators are a great solution to this issue. They have both adjustable voltage versions and preset (like 6v) ones. High quality and modular so if you change things out the regulator can be easily removed.

Whit
I second this post.
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