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Old 12-04-2012, 06:21 PM   #1
artski
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Default High Voltage tail servo

Anyone have any experience with JRs new brushless servos?

I am specifically interested in the MPH83G to use on my new Whiplash build. Will be running 8717s on the cyclic and want to use a HV servo on the tail to avoid using a stepdown regulator.
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Old 12-04-2012, 06:27 PM   #2
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I would get the outrage 9188 HV servo.Way more toqure and much faster compare to JR
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Old 12-04-2012, 10:06 PM   #3
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+1 the 9188 is a great servo. I've got them in both my Goblins and picked one up on Black Friday to swap with the 251 in my TDR...
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Old 12-04-2012, 10:39 PM   #4
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Was just comparing the specs and noticed that the MPH83G has plastic gears. 240.00 for a servo with plastic gears?
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Old 12-04-2012, 11:30 PM   #5
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Plastic gears not so bad, tail servos do not have monster torquevthat warrant beefy gears, lighter to get the instant response we require.

Another alternative is the Futaba BLS256HV.
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Old 12-05-2012, 04:23 AM   #6
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I have one on my Aurora. Works as effortlessly as my 9088 and 9188 on other, smaller machines. The torque difference and speed seem pretty negligeable to be honest. Not sure if that means the JR has better dynamic or instant torque, but it doesn't seem to be lacking in anything except the ability to be run on anything above 5.2V.

I admit, I want to trust and rely on the Torq spec numbers a lot more than the JR, but it's 110% unfounded in my experience. I've always like JR servos and this one definitely ups its game from the 8900G which is still a pretty tough servo to beat IMHO. The JR also carries a vastly superior warranty coverage if you ever have any problems with it.
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Old 12-05-2012, 07:30 AM   #7
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Quote:
Originally Posted by skunkworx View Post
I have one on my Aurora. Works as effortlessly as my 9088 and 9188 on other, smaller machines. The torque difference and speed seem pretty negligeable to be honest. Not sure if that means the JR has better dynamic or instant torque, but it doesn't seem to be lacking in anything except the ability to be run on anything above 5.2V.

I admit, I want to trust and rely on the Torq spec numbers a lot more than the JR, but it's 110% unfounded in my experience. I've always like JR servos and this one definitely ups its game from the 8900G which is still a pretty tough servo to beat IMHO. The JR also carries a vastly superior warranty coverage if you ever have any problems with it.
The specs show it can be run on all voltages from 5.2 up to 7.4.
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Old 12-05-2012, 10:41 PM   #8
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Nope, it's only rated at 4.8V to 5.2V max. JR unofficially claims that you can run as high as 6V without worry, but warranty is strictly not covered under such applications. I think additionally they can go above that mark for a short period of time (like 6.6V on a LiFe pack), but it's likely not very good whatsoever on the servo.
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