Servo question

[Glen.Watson at aspentech.com]

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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