8717 servo slop

Talegunner · 06-02-2009, 06:35 PM

I have a new set of 8717 servos running at a constant 6.9 volts from a jewel generator in a spectra G gasser.
after 3 gal of fuel I have noticeable slop in all 3 cyclic servos.
has any one else been experiencing this with these servos

aaronredbaron · 06-02-2009, 07:27 PM

If the slop gets bad enough, they could lock up on you, How much slop are you talking about? A small amount might be acceptable, might not, I would call Horizon Hobby, they may want you to send them in for service, but I can't say for sure.

Talegunner · 06-02-2009, 10:54 PM

I'm sure if I send them in they will replace them. I just trying to find out if others are finding the same thing with these servos. I like performance but I have servos with hundreds of flights on them that don't have this much slop.

3D-Seth · 06-03-2009, 09:43 AM

I have not used the 8717 in any hells but I have not had an issue with them on the throttle of my airplanes.

Seth

aaronredbaron · 06-03-2009, 11:53 AM

I guess what it comes down to, with this servo or any other, is your subjective opinion. Even if its not likely to fail, if it is on the top of your mind and you are worried they may fail, it could affect your flying. You have to go with your gut, the more experience you have, the more you have to just trust your instinct. This is one of the difficult things about helping people through the internet, sometimes you just have to wiggle, jiggle, and get a feel for it and go with what feels right. I tend to ere on the side of caution; if it were my bird and I even thought they might be getting bad enough to cause an issue, I would send them in. In the back of my mind, I would always be worried they might fail and would not be able to fully focus on my flying. If I knew they might be a problem before hand, continued to fly them, and eventually had a failure, I would be very mad at myself for not following my instinct.

One important thing to note
I was told to watch out for the servo horn itself wearing out on the 8717s. The pilot who informed me thought his servos were getting sloppy, but discovered it was merely the splines in the horn itself wearing out. Certainly worth looking at.

jairoblaster · 06-03-2009, 11:58 AM

I run a full set of 8717s on my Vibe 90 at 7.2volts and mine have about 6 gallons on them and the are as good as the day I got them out of the package. I will say that I do bang them pretty hard. However I had to send one in almost as soon as I got them it just burnt up, luckly it was on the ground when it happend. I sent it to horrizon and they took care of it right away, and were able to give me a good reason that it might have burnt other than the 7.2 issue witch is not a issue at all no matter what they might say. in fact in the AR7100R manual wich I do run It says that it was designed to run those specific servos at that voltage. any way I recomend sending them in for service. and write a note to speak with a tec about what you can do to help the servos from doing this again. its my gess that you are quite possibly running them to far on the out side of the travel limmit. with a big bird like that. or if you had a lot of vibration on the bird, like say from a paddel that is slightly turned up or down. With a bird that big you might not be able to see that vibration in it because there is enophe mass to hide it, however it is still there. Im not saying that is the problem Im just throwing it out there.

aaronredbaron · 06-03-2009, 01:18 PM

that is a great point about having too much travel or vibes. If you did have too much travel and were banging the stops, it could cause some MAJOR problems, especially because those servos have so much power.

jones007 · 06-03-2009, 04:40 PM

Quote:

Originally Posted by Talegunner

I have a new set of 8717 servos running at a constant 6.9 volts from a jewel generator in a spectra G gasser.
after 3 gal of fuel I have noticeable slop in all 3 cyclic servos.
has any one else been experiencing this with these servos

Every JR servo I have ever owned has developed a significant amount of slop in a short period of time. If you don't mind the slop, I think the servos generally hold up well. Lately I've had more luck with Futaba servos. I've got about 140 flights on my BLS451s running on unregulated 2S Lipo (more than 8v), and they still have no discernible gear slop. In terms of slop, I've had really good luck with the Hitec Karbonite servos as well, although they usually don't compete with Futaba in terms of the speed and torque available.

Just so people don't think I'm a "Futaba" guy, I actually very much dislike the newer Futaba Txs, and use either a 12X or Spektrum for all my Tx/Rx needs.

--Kevin

jairoblaster · 06-03-2009, 06:45 PM

You know all my JR servos do develop slight slop and I've never had one give out on me yet my 8717s are tight though, but they only have a year on them. My 8611As have like 7 years and multiple crashes on them and they still work great with just a little slop. I say all that to say this if it was my heli I would not fly it with slop servos, but slop to you might not be slop to me. What ever you do if you send them in IDE like to know what they say about it

06-02-2009, 06:35 PM	#1
Talegunner Crash! Glue! Repeat! Join Date: Aug 2008 Location: Deer Park WA. Posts: 4	8717 servo slop I have a new set of 8717 servos running at a constant 6.9 volts from a jewel generator in a spectra G gasser. after 3 gal of fuel I have noticeable slop in all 3 cyclic servos. has any one else been experiencing this with these servos

06-03-2009, 09:43 AM	#4
3D-Seth Shankin' and Plankin' Join Date: May 2009 Location: Champaign, IL Posts: 162	I have not used the 8717 in any hells but I have not had an issue with them on the throttle of my airplanes. Seth __________________ Horizon Hobby Employee Desert Aircraft Sponsored Pilot Fancy Foam Models Sponsored Pilot Tru-Turn Spinners Sponsored Pilot

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06-02-2009, 07:27 PM	#2
aaronredbaron Main Rotor Editor Join Date: Aug 2008 Location: West Linn, OR Posts: 315	If the slop gets bad enough, they could lock up on you, How much slop are you talking about? A small amount might be acceptable, might not, I would call Horizon Hobby, they may want you to send them in for service, but I can't say for sure.

06-02-2009, 10:54 PM	#3
Talegunner Crash! Glue! Repeat! Join Date: Aug 2008 Location: Deer Park WA. Posts: 4	I'm sure if I send them in they will replace them. I just trying to find out if others are finding the same thing with these servos. I like performance but I have servos with hundreds of flights on them that don't have this much slop.

06-03-2009, 11:53 AM	#5
aaronredbaron Main Rotor Editor Join Date: Aug 2008 Location: West Linn, OR Posts: 315	I guess what it comes down to, with this servo or any other, is your subjective opinion. Even if its not likely to fail, if it is on the top of your mind and you are worried they may fail, it could affect your flying. You have to go with your gut, the more experience you have, the more you have to just trust your instinct. This is one of the difficult things about helping people through the internet, sometimes you just have to wiggle, jiggle, and get a feel for it and go with what feels right. I tend to ere on the side of caution; if it were my bird and I even thought they might be getting bad enough to cause an issue, I would send them in. In the back of my mind, I would always be worried they might fail and would not be able to fully focus on my flying. If I knew they might be a problem before hand, continued to fly them, and eventually had a failure, I would be very mad at myself for not following my instinct. One important thing to note I was told to watch out for the servo horn itself wearing out on the 8717s. The pilot who informed me thought his servos were getting sloppy, but discovered it was merely the splines in the horn itself wearing out. Certainly worth looking at.

06-03-2009, 11:58 AM	#6
jairoblaster Master of Disaster Join Date: Nov 2008 Location: Joplin Mo Posts: 299	I run a full set of 8717s on my Vibe 90 at 7.2volts and mine have about 6 gallons on them and the are as good as the day I got them out of the package. I will say that I do bang them pretty hard. However I had to send one in almost as soon as I got them it just burnt up, luckly it was on the ground when it happend. I sent it to horrizon and they took care of it right away, and were able to give me a good reason that it might have burnt other than the 7.2 issue witch is not a issue at all no matter what they might say. in fact in the AR7100R manual wich I do run It says that it was designed to run those specific servos at that voltage. any way I recomend sending them in for service. and write a note to speak with a tec about what you can do to help the servos from doing this again. its my gess that you are quite possibly running them to far on the out side of the travel limmit. with a big bird like that. or if you had a lot of vibration on the bird, like say from a paddel that is slightly turned up or down. With a bird that big you might not be able to see that vibration in it because there is enophe mass to hide it, however it is still there. Im not saying that is the problem Im just throwing it out there.

06-03-2009, 01:18 PM	#7
aaronredbaron Main Rotor Editor Join Date: Aug 2008 Location: West Linn, OR Posts: 315	that is a great point about having too much travel or vibes. If you did have too much travel and were banging the stops, it could cause some MAJOR problems, especially because those servos have so much power.

06-03-2009, 06:45 PM	#9
jairoblaster Master of Disaster Join Date: Nov 2008 Location: Joplin Mo Posts: 299	You know all my JR servos do develop slight slop and I've never had one give out on me yet my 8717s are tight though, but they only have a year on them. My 8611As have like 7 years and multiple crashes on them and they still work great with just a little slop. I say all that to say this if it was my heli I would not fly it with slop servos, but slop to you might not be slop to me. What ever you do if you send them in IDE like to know what they say about it

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