Servos

[Troy Newman]

Bill,

 I have a spread sheet that has all the specs. Some of the Servos are no longer available from the old days. It shows a comparison on the specs as the servos evolved....but I can send you the sheet offlist as a reference.


Central might have some of the 9411SA's in stock as an actual part number from the factory..... I have not checked with them in a few weeks....but They usually get this kind of stuff right way. I know the 9411SA as a day one servo is out in hobby shops. It's a cool deal with the servos about $5 cheaper and no work to convert them day 1. Also the 3421SA's have been around for a couple months I think. 

Another note for all you guys with worn 9411 gears. JR service will replace the gears for at N/C if they are sloppy due to normal use. You might ask about converting to the SA for you. They are already sticking gears in it...and the result would be a less expensive gear change for them. I don't know the rules they have to follow....but it never hurts to ask. I have found the techs to be more than willing to serve your needs.

By the way I am using standard 9411's in my Flashdance on the elevators. The reason is the huge 3D surfaces. The stock gears work fine...they just develop a little more slop quicker than the nylon converts. I was concerned about a really hard wall or Pop up and these huge elevator surfaces driving the servo instead of the other way around.

I would be happy to write up something for the KF regarding the conversions many of us are doing.

Troy
  ----- Original Message ----- 
  From: Bill Glaze 
  To: discussion at nsrca.org 
  Sent: Wednesday, February 04, 2004 10:10 AM
  Subject: Re: Servos


  Eric & All:
  What is the U.R.L. that Horizon is using for a complete servo listing?  I've got one dialed in, but while it lists quite a few servos, it doesn't list anything in the 9000 series stuff at all.  Actually, it acts more like a hobby shop listing, than it does Horizon's official web site.  And, for some reason or other, Horizon's web site seems to have a security problem; must be the wrong site.  thanks.

  Bill Glaze

  Henderson,Eric wrote:

    Nat,
           The 9411 has this weakness. It does not matter if it is an SA version or not. I run them in ailerons only. The conversion set to make a 9411 into a 9411SA are 9011 gears,

    Unfortunately if you spin up the servo arm by hand and let it hit the "stops" anywhere near firmly, it strips the little gear next to the motor. The motor keeps on going and does the damage. Both the metal and plastic gear sets use the same last gear, which is plastic.

    I have never had an in-flight failure with this servo but it treat it with care when it comes to moving the controls by hand. The wing bags take care of the aileron servos.

    What is most annoying is that this is the only Digital low-profile that they market over here.

    The 9011's that I use do not seem to be this vulnerable. My guess is that this is due to the motor types and how fast/freely they move when spun up by hand.

    Sorry, I didn't solve the problem but I can confirm it to be the servo and not just you :-)

    Regards,

    Eric.


    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Nat Penton
    Sent: Tuesday, February 03, 2004 10:29 PM
    To: discussion at nsrca.org
    Subject: Servos


    I had two DS9411's coverted to SA . A gear , or gears, stripped in both with relatively no torque by hand. They could have easily crashed an airplane. Does  the stock SA have all plastic gears, or only one or two ? These were converted to all plastic.
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