Servo Types

[Morton]

Guilty as charged. ;-)

Ray

Mark Hunt wrote:

> You know you're a pattern flier if:
>  
> (see below)
>
>     ----- Original Message -----
>     From: Morton <mailto:jrmmorton at earthlink.net>
>     To: discussion at nsrca.org <mailto:discussion at nsrca.org>
>     Sent: Saturday, March 20, 2004 5:29 PM
>     Subject: Re: Servo Types
>
>     Ryan,
>
>     Sound like a good case for a Decision Matrix, send me an e-mail
>     and I will send a program that will analyze your choices with any
>     variables and whatever weights you want to assign to those variables.
>
>     Ray Morton
>     jrmmorton at earthlink.net
>
>     Ryan Wiesehan wrote:
>
>>     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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