[NSRCA-discussion] Servos

[David Lockhart]

Nylon has better wear properties and the geartrains can be produced with tighter lash without risk of binding.  The only real reason I can see to use metal gears is to increase strength without increasing volume - which is needed when these servos are used in applications with high impact loads (big IMAC style stuff and some of the glider stuff - mostly for "shock" at landing as I understand it).

The "sa" is the nylon gear version - actually, to be accurate, all the servos I listed use a metal pinion on the motor, three nylon intermediate gears, and the final output gear is metal (to reduce flex in the output shaft).  FWIW, depending on the servo, you can save 0.1+/- oz changing the final output gear to nylon.

Dave

  ----- Original Message ----- 
  From: Stuart Chale 
  To: 'NSRCA Mailing List' 
  Sent: Wednesday, March 08, 2006 9:14 PM
  Subject: Re: [NSRCA-discussion] Servos


  Thanks for the input.  The specs of the servos you picked do seem to fit their use.

  Why convert the metal gears to nylon on the elev servo?

  What is the difference between SA and the regular versions. Is it just metal vs nylon?

   

  Stu

   


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  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of DaveL322 at comcast.net
  Sent: Wednesday, March 08, 2006 1:20 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Servos

   

  Stu,

   

  The JR servos will work with the Futaba RX, and you'll find quite a few guys using JR servos with non JR RX/TX.

   

  My preferred setup -

  Ail - 2x9411sa

  Ele - 1x8417sa (convert metal gears to nylon using 8231 gearset).

  Rud - 1x8411sa

  Thr - 1x3421sa

   

  You can certainly find stronger servos that are of the same approximate size/weight, but I've run them back to back with the above and on a 2M pattern plane, more servo than the above is just more weight and expense.

   

  Since the day of the analog 9101, pattern servos now are digital - I wouldn't go with anything that is not digital.

   

  Regards,

   

  Dave Lockhart, Team JR

  DaveL322 at comcast.net

   

   

    -------------- Original message -------------- 
    From: Stuart Chale <schale at optonline.net> 

     

    Ok a basic question.  Which servos do you like to use on your 2M planes.  I am looking for Futaba or Futaba compatible models.  The last quality servos I bought were 9101's   Technology has advanced since I have been away and the planes have gotten bigger J

     

    Thanks,

    Stuart C



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