Servo question

[Gray E Fowler]

No- thats not what Glen said......He has better, more precise control with 
the digitals and he has managed to eliminate the quirkiness at center. But 
stay with your current servos Wayne....they are good enough for 
you...yuk...yuk



Gray Fowler
Principal Chemical Engineer
Composites Engineering




"Wayne Galligan" <wgalligan at goodsonacura.com>
Sent by: discussion-request at nsrca.org
08/01/2003 08:50 AM
Please respond to discussion

 
        To:     <discussion at nsrca.org>
        cc: 
        Subject:        Servo question


That was almost my point at the beginning of this thread.
Actually it was the battery draw thingy I was getting to but good points 
have come from the whole thread.
 
Wayne G.
----- Original Message ----- 
From: Jeff Hughes 
To: discussion at nsrca.org ; discussion at nsrca.org 
Sent: Friday, August 01, 2003 8:31 AM
Subject: RE: Servo question

So, let me get this straight. You buy better servos, than make them 
mushy with expo so the feel like the cheap servos, then decrease 
travel to make them feel closer to the cheap servos. Sounds like the 
cheap servos are what we're all looking for!


> 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
> 

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