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Old 06-19-2016, 01:21 PM   #1
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JR servo's

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Bought a plane, Ugly Stick .60 with JR NES 507 servos installed. Looked them up and all I found was specs for 4.8V, does this mean do not use 6v as a burn out can happen? It is powered with a Saito 1.00 . I can switch over to Hitec as I like the 6V over 4.8V.(personal choice) and the 507's seem a little lite in torque to me.
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Old 06-19-2016, 03:36 PM   #2
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Re: JR servo's

Been a while since I had any in my hand, or open on the table.

IMO, those would likely be comparable to the Futaba S-148 for their holding power and speed. Even if you tried and got away with 6V their specs would fall short of more modern units.

Also, if typical of the genre they will be bushing type so the harder you work them the more they will drag unless taken apart and lubed, (on older servos I found that a good idea anyway). In some cases if available I replaced them with bearings. Seems there was one standard used throughout different manufacturers so able to interchange.

In the end, when I got an airframe with this old a servo would take the view no idea of the history or usage so not worth risking an airframe with them in a critical position. There is the option of continuing to run rudder and/or throttle but that's as far as I would go.

Back when I started over 3 decades ago would have accepted a servo like this and been grateful. Nothing essentially wrong with their design, just with the price point of current units there are so many other options.

On that note, with a craft running that old a servo it would be a good idea to check the rest of the system. If the flight battery had been connected for years of storage and use there are some problems that can develop, (Black Wire Disease) as well. Each conductor, connector and switch set on the ground side of the battery can corrode.

Also, modern servos can provide better speed and torque, but require an even more reliable power supply.
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Old 06-19-2016, 05:21 PM   #3
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Re: JR servo's

Ugly stick 60 with 507's on 6.6 volts is fine. 507's were single ball bearing sport servos.
If they center and are smooth don't hesitate to use them.
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Old 06-19-2016, 08:21 PM   #4
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Re: JR servo's

I think the ball bearing ones were actually 517, the 507 was bushed, but they should be fine on 6V. I've run tons of them (507/517) in the past on 6V and never had an issue. They are bullet proof servos.
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Old 06-19-2016, 09:39 PM   #5
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Re: JR servo's

Thanks for the come back fellows, I was thinking changing all except the throttle but have changed my mind. I will do a servo test on all. Then the actual test will be in the fly zone some day! Thanx big time.
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Old 07-14-2016, 12:44 PM   #6
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Re: JR servo's

I had a few of these. I did the EMS Ball bearing exchange. Worked fine for sport planes.
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