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HomeAircraftHelicopterGasser Model RC HelicoptersOther › JR 8717 servos getting sloppy real fast
06-03-2009 12:47 AM  9 years agoPost 1
TaleGunner

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Deer Park WA

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I posted this in the JR area with little response so I will see what the real men of RR think

I have a little over 3 gal on a new set of 8717 cyclic servos running in a spectra G at a regulated 6.9v with a generator they perform very well but they seem to be developing slop very quickly. I have never had a set of servos that #1 cost this much #2 developed slop this fast

Any one else having any issues with these servos?

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Spectra-G, Ion X-2

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06-03-2009 01:01 AM  9 years agoPost 2
eSmith

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Edmonton, Alberta, Canada

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I'm flying JR9100's and before that had many sets of 8311's and I did notice that the metal gears do develop slop but I've never actually felt it in flight. I think your prolly right but I'd look at nylon vs. metal gears and not so much one specific servo or brand.

A few years back the 8311's were the "8717's" of the day and the 3D guys here were known to swap in new gear sets from time to time out of wear. You could get the 8311's in either nylon or metal and the slop issue wasn't there so much with the nylon but you could strip them easier in flight. The metal got sloppier faster but you didn't need to change them often because of stripping. In either case though it looks like gears are considered consumables and do need maintenance from time to time.

I do perfer JR gear but I have owned Futuba servos as well and have no problem with them at all, however I'm not in the best position to comment on wear on any of them as I don't fly it too often, Any Futuba/airtronics/hitec/ace/YourServoBrandHere guys have anything to add?

cheers,

-eSmith.

http://www.edmheli.ca

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06-03-2009 01:08 AM  9 years agoPost 3
RayoVac

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raptor4ever is a THIEF!!!

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I posted this in the JR area with little response so I will see what the real men of RR think
Hey now, I know I am nobody... but I responded!

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06-03-2009 01:17 AM  9 years agoPost 4
TaleGunner

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Deer Park WA

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Hey now, I know I am nobody... but I responded!
Yes you did and thank you. I didn't mean anything, I just wasn't getting the responses I expected there and since there in a gasser I thought I would try here.

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Spectra-G, Ion X-2

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06-03-2009 01:49 AM  9 years agoPost 5
RayoVac

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I was just giving you crap Gunner!!! I needed to feel some love!

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06-04-2009 11:29 PM  9 years agoPost 6
Justin Stuart (RIP)

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Plano, Texas

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Could it be the potentiometers are going bad because you are running them at 6.9 volts, or do you think it is just the gears that are getting sloppy?

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06-04-2009 11:40 PM  9 years agoPost 7
TaleGunner

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Deer Park WA

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I think its the gears they are suposed to handle 8v plus I can click them back and forth with or witout power on.

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Spectra-G, Ion X-2

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06-05-2009 12:57 AM  9 years agoPost 8
Justin Stuart (RIP)

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Plano, Texas

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I have 8717's in my Spectra too, but I have not flown them yet because I am still waiting on an engine.

Maybe 3 gallons is all you can get out of gears in these servos?

I know from experience that metal gear servo save you from having to worry about stripping gears on hard 3D maneuvers, but they also develop slop a lot quicker than nylon.

Are you comfortable replacing the gears yourself? The gear sets are probably about $15 dollars each, and if the motors or potentiometers are not damaged, then the servos will be good as new again.

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06-05-2009 06:10 AM  9 years agoPost 9
Excalibur

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Destination: Earth

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Are you comfortable replacing the gears yourself? The gear sets are probably about $15 dollars each, and if the motors or potentiometers are not damaged, then the servos will be good as new again.
Replacing gears in JR servos is no big deal - it's relatively simple. Paying for the new gear sets, on the other hand, hurts like hell.

I paid $24.00 a set for nylon gears for the DS8311's, I can't imagine what it will cost for the newer servos. If you are lucky, you will only have one gear stripped in a crash, leaving you with a bunch of new unused gears that you hopefully can use on the next crash, since the same one's don't always strip every time.

Xcal

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06-05-2009 06:46 AM  9 years agoPost 10
RappyTappy

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Traveling the USA

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Do you have a value on the slop? I measured my 9452's with metal gears at about 1.5mm give or take after 10 gallons of flying. My nylon geared throttle servo with less time has the same amount of slop. Thing is the nylon "feels" less sloppy because it doesn't have the clicking sound that metal gears do.

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06-05-2009 03:16 PM  9 years agoPost 11
Dr. Fibinotchi

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Sioux Falls SD

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hmm
Why would metal gears be developing so much slop? I agree 8311's rock if the pots and speed where a little better it would be the perfect servo.

-C

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.

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06-05-2009 05:16 PM  9 years agoPost 12
TaleGunner

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Deer Park WA

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the slop is approx 1mm after 3 gal at the end a a 3/4" arm. maybe minimale but seems excessive for such a high rated servo in such a short time frame.
Why would metal gears be developing so much slop?
exactly why

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Spectra-G, Ion X-2

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06-05-2009 08:02 PM  9 years agoPost 13
Justin Stuart (RIP)

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Plano, Texas

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Metal gears are notorious for developing slop. If this was not the case, then plastic gears would have been removed from the market long ago.

Talegunner, I think you'll have to replace the gears when the slop begins to affect the flight characteristics of the helicopter, and just consider this a normal part of routine maintenance.

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06-05-2009 08:33 PM  9 years agoPost 14
RappyTappy

rrProfessor

Traveling the USA

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You should take the same arm and put it on a jr servo with nylon gears and get a reading for comparison.

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06-05-2009 11:00 PM  9 years agoPost 15
torenhg

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Orange County, SoCal

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just got 8717's for all but the throttle servo. now I am a bit concerned...

350QX
Trex 450
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Fury 55
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Furion6
Trex 500

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06-05-2009 11:21 PM  9 years agoPost 16
Malc1

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EVESHAM,UK

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Yeah and I`ve just got 3 x 8915`s and an 8911 for my new Spectra

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06-05-2009 11:23 PM  9 years agoPost 17
TaleGunner

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Deer Park WA

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they fly great even with the slop I cant tell it in flight. I was just seeing if this was others experience. there is no danger of them breaking or failing from what I can tell and taking them apart they look fine. they just got slop fast what I was hoping was this was normal and would stabilize for a long time. it seems they are just too new so fly em and add to our info.

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Spectra-G, Ion X-2

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06-05-2009 11:56 PM  9 years agoPost 18
RappyTappy

rrProfessor

Traveling the USA

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just got 8717's for all but the throttle servo. now I am a bit concerned...
You can send them here. I can deal with 1mm "slop"

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06-06-2009 01:34 AM  9 years agoPost 19
Justin Stuart (RIP)

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Plano, Texas

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torenhg, you said,
just got 8717's for all but the throttle servo.
Are you using an 8717 on the tail also?

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06-06-2009 01:35 AM  9 years agoPost 20
TaleGunner

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Deer Park WA

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no 8900g

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Spectra-G, Ion X-2

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