Servo Types

[Morton]

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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