Servo question

[John Ferrell]

I discovered a long ways back it is much better for my self esteem count the number of places from the bottom! Except, of course, when I am first!
John Ferrell 
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606  
johnferrell at earthlink.net
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"

  ----- Original Message ----- 
  From: Gray E Fowler 
  To: discussion at nsrca.org 
  Sent: Friday, August 01, 2003 9:07 AM
  Subject: RE: Servo question



  Glen 

  I have never been able to really reproduce that coreless feel, yet with more control due to digitals. I added more expo but all surfaces around center are still more active. I rarely under roll, always over roll. Are you saying that if I reduce the travel of the servo, yet keep the same surface deflection that it gets more controllable? If this is the case I should easily be able to move up from 22nd place to 21st... 



  Gray Fowler
  Principal Chemical Engineer
  Composites Engineering 


       Glen.Watson at aspentech.com 
        Sent by: discussion-request at nsrca.org 
        07/31/2003 03:59 PM 
        Please respond to discussion 

               
                To:        discussion at nsrca.org 
                cc:         
                Subject:        RE: Servo question 



  Early this season I swapped my Futaba 9102 coreless wing servos for 9150 digitals.  As Gray mentions I first added more expo to reestablish feel.  With this added expo (mushiness) when doing points and slow rolls it was difficult to maintain a consistent roll rate.  By decreasing travel volume (9ZAP AFR) in addition to reducing relative expo, roll rate became more controllable and predictable. I sense there is a relative amount of travel volume + expo needed to overcome surface blow back with non-digitals to achieve desired mushiness. 
   

  Switching to digital wing servos has greatly changed the rolling characteristics for me in a positive way.  Rolls are crisper, more predictable in all air speeds and stop-start with more authority. 

   

  Glen 

   

   

  -----Original Message-----
  From: Gray E Fowler [mailto:gfowler at raytheon.com]
  Sent: Thursday, July 31, 2003 3:04 PM
  To: discussion at nsrca.org
  Subject: Re: Servo question 

   


  What I noticed when switching to digitals was the need to add more exponential. The coreless had a built in mushiness around center. Now I program in the amount of mushiness I want. This probably means that once you get used to a certain mushiness you would fly as well with or with digitals.



  Gray Fowler
  Principal Chemical Engineer
  Composites Engineering 


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