Servo question

[Jeff Hughes]

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
>  
>  
> -----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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