Servo Types

[Del K. Rykert]

Hi Ryan.
    I find that as your pattern flying advances in the classes the need for very decent servos is more apparent. The lowest I would recommend is coreless ballbearing and 5 pole motor. Pick your torque for the size of your aircraft. If plan to upgrade your plane in future as you move up in classes choosing 25.00 servos are probably not a good investment.  Don't sell the throttle servo short either and go with a cheapy. Can effects your idle.
    IMHO...
 
                             del 
               NSRCA - 473 
  ----- Original Message ----- 
  From: Ryan Wiesehan 
  To: discussion at nsrca.org 
  Sent: Saturday, March 20, 2004 5:37 PM
  Subject: Servo Types


  Hello,

  I tried to research this on my own without rehashing servo talk on the list, but I couldn't find an answer that satisfied my curiosity.  I will outline my research first so that you may better help me out.  I want to put new servos in my Used Summit III, it has 148's in it now and I think it flies great, no problem with torque, and there isn't a centering problem between days and flights.  But, I am always hearing that better servos will make you fly better.  And I want to be a better flier.  So, I have spent the last three weeks researching servos.  This research must be one of those instances when you are confused because you are paying attention.  I want is spend less than $180, $25 - $40 per servo and 40oz ok ailerons, 60oz rudder and elevator.  Here is how it breaks down in my mind from the research.  

   

  1.         The four basic qualifying specs for servos:  speed, torque, weight and price.

  2.         Then you have motor type and non-digital vs. digital.

  3.         Lastly, you have brand, and I've tried JR, Futaba, Hitec, TowerHobbies and Expert.  

   

  I am most interested in hearing your opinions about #'s 1 and 2; I don't really care to debate brand in this thread

   

   

  3-pole non-digitals; can have problems centering due to the splits in the armature.

   

  5-pole non-digitals; don't know there isn't really much information.  Would someone help?) I assume they have better centering and maybe more power than a 3-pole, I am thinking these might work for me so please try and sell me on the coreless. 

   

  Coreless non-digital; has a different armature system without poles that allows for better centering and a lighter core.  Most of the low end coreless seem like they are slower than a 3-pole.  I am starting to thing that the standard specs for speed are misleading. If the coreless motor is lighter and accelerates more quickly than a 3-pole why does a $30 coreless post the same specs as $9 el cheapo?

   

  Now, here is where I really get confused, change all of the above to digitals.  If the circuit board is always sending centering and position location at 3 times the rate previously to a 3-pole motor, why wouldn't I want to buy it?  It should center fine because with a digital servo centering is powered. 

   

  Wow, sorry, that was a long email.  I guess all that I am asking is for someone to explain why money spent on servos is valid.  Because, I just took out my plane last weekend after all this research and I couldn't figure out how it could be better. 

   

  Thanks,

   

  Ryan Wiesehan

   

  FreightQuote.com

  New Business Sales 

   

   

   
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