Servo question

[Gray E Fowler]

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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