Notices
RC Pattern Flying Discuss all topics pertaining to RC Pattern Flying in this forum.

Futaba Servo s9650 - gear play

Old 10-11-2006, 08:46 AM
  #1  
stek79
Senior Member
Thread Starter
 
Join Date: Apr 2005
Location: , ITALY
Posts: 625
Likes: 0
Received 0 Likes on 0 Posts
Default Futaba Servo s9650 - gear play

Hello guys,
I would be very glad to hear some experiences from those of you who use / used the 9650 digital mini servo.

I installed two of them in the stabs, made a very tight control linkage (great mechanical advantage with ball links - no play here) and then, holding the control surface, I noted a certain play which is essentially all due to gear play.

I measuread a play of the surface of approx 1 degree, with the servo still - radio on.

I'm very surprised that such a good servo has this play

What are your experiences?

Thanks in advance.

[][][]
Old 10-11-2006, 04:07 PM
  #2  
darkvader
Senior Member
 
darkvader's Avatar
 
Join Date: Sep 2003
Location: Azeitao, PORTUGAL
Posts: 142
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

I have exactly the same opinion as yours
Old 10-11-2006, 05:32 PM
  #3  
Dave Smith
Senior Member
 
Join Date: Aug 2002
Location: Halifax, NS, CANADA
Posts: 160
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

I have used the Futaba 9650 servos in the stabs of my last two airplanes,and I agree there seems to be a certain looseness in the gears. Yet,I can not detect any tracking problems when flying.
I believe these servos were originally intended for off-road car racing,so maybe that discipline doesn't need the close tolerances???
There are some very good fliers using these.
Chad Northeast,any comments??


Dave
Old 10-12-2006, 07:41 AM
  #4  
stek79
Senior Member
Thread Starter
 
Join Date: Apr 2005
Location: , ITALY
Posts: 625
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

Guys, I have found the problem...

There was some play in the ball links!!! I'm very surprised about that, since I used top quality parts...

So no issues about the Futaba 9650 - sorry for the wrong information. Now I'm happy
Old 10-12-2006, 08:48 AM
  #5  
Dave Smith
Senior Member
 
Join Date: Aug 2002
Location: Halifax, NS, CANADA
Posts: 160
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

Stek79: I would suggest you securely install an arm on a new 9650,then try rotating it directly by hand. Do the same with another new Futaba digital servo (different size) and I will be surprised if you don't find a wee bit of sponginess in the 9650 compared to the other. Even after saying this,I am still going to install the 9650's in my new stab (Black Magic) as I can not see any tracking problems with elevators on my previous two installations. (Giles 202 built from Gator Plans,and a Piedmont Brio)

Dave
Old 10-12-2006, 10:17 AM
  #6  
rgreen24
My Feedback: (6)
 
rgreen24's Avatar
 
Join Date: Jan 2002
Location: Omaha, NE
Posts: 1,108
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

How do you guys mount the 9650 with it's weird mounting holes? Do you cut the one off that you are not going to use?
Old 10-12-2006, 11:08 AM
  #7  
Dave Smith
Senior Member
 
Join Date: Aug 2002
Location: Halifax, NS, CANADA
Posts: 160
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

Yes,cut them off with an x-axto type saw. Do not snip them with cutters;you might break the case.
The instructions with the servo mention how to cut them off.
Old 10-12-2006, 02:35 PM
  #8  
rgreen24
My Feedback: (6)
 
rgreen24's Avatar
 
Join Date: Jan 2002
Location: Omaha, NE
Posts: 1,108
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

Thanks for the info. I have been using the JR 3421SA. however the 9650 are much less expensive. So I will give them a try this year.
Old 10-13-2006, 04:12 AM
  #9  
stek79
Senior Member
Thread Starter
 
Join Date: Apr 2005
Location: , ITALY
Posts: 625
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Futaba Servo s9650 - gear play

ORIGINAL: rgreen24

Thanks for the info. I have been using the JR 3421SA. however the 9650 are much less expensive. So I will give them a try this year.
Interesting rgreen, how do you compare these two servos, for example regarding gear play?

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.