[NSRCA-discussion] SD-10

[Anthony Frackowiak]

Just for general info, when I was working at NASA a few years back I  
did a test with the Air Force Test Pilot School that studied latency  
in control systems. They found in their simulation tests that anything  
faster then about 40-50 ms was not noticed by the pilot. Resolution  
was not studied in that test, but I sure felt a difference when I went  
from a 10X with 1024 to a 12X with 2048. Just another opinion!

Tony


On Aug 24, 2009, at 1:18 PM, Atwood, Mark wrote:

> I'll take a stab, and I'm blind copying Mike Greensheilds (don't  
> feel comfortable putting his email out on the list) who is the  
> product manager for ATX here in the states.  He may chime in with  
> additional background.
>
> My understanding is that when Sanwa was evaluating speed vs  
> resolution, speed was deemed a much more critical factor.  1024  
> resolution is already to the limits of our ability to "feel" any  
> difference where as the speed/latency was much more noticable.    
> Cost does come into the equation such that for a $500 radio, they  
> couldn't do both.
>
> 1024 resolution provides better than 1/10deg at 90 deg of rotation.   
> That's less than 1/1000" on a 1" servo wheel.
>
> The speed on the other hand is just now approaching our limits of  
> "feel".   The faster systems clearly feel more connected and are  
> noticable when flying Snaps and other rapid input maneuvers and  
> especially flying 3D with the helis.
>
> So the choice was to invest in a fast response system with 1024  
> resolution.
>
> Does anyone know the tolerances of our servo accuracy?  I'd be  
> curious to know how high a resolution they can accurately replicate.
>
> Mike?  Any input from the source?
>
> -Mark
> --------------------------
> Sent from my BlackBerry Wireless Handheld
>
>
> ----- Original Message -----
> From: nsrca-discussion-bounces at lists.nsrca.org <nsrca-discussion-bounces at lists.nsrca.org 
> >
> To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
> Sent: Mon Aug 24 15:30:03 2009
> Subject: [NSRCA-discussion] SD-10
>
> Hi Anthony, Jim, Mark , and Others who Responded,
>
>
>
> Thanks for your valuable input. I’ve read that this radio’s  
> resolution is or is among the very  fastest; so much so that even  
> digital servos can’t keep up with it. I understand  that the system  
> is 1024 , but can’t help but  wonder why it isn’t 2048. I’m sure  
> I’ll get past my  hangup, but would appreciate everyone’s insight’s  
> on that one.
>
>
>
> Thanks,
>
> Frank Imbriaco
>
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