Futaba radio question

[tph1 at bellsouth.net]

> Thanks very much Troy, Ron.
> From: "Troy A. Newman" <troy_newman at msn.com>
> Date: 2004/11/19 Fri AM 09:46:42 EST
> To: <discussion at nsrca.org>
> Subject: Re: Futaba radio question
> 
> Negative expo on Futaba is softer neutral
> 
> .................
> and Positive expo on JR is softer neutral
> 
> It takes about 20-30% expo just to get the surface to throw linear. The
> reason is the servo is in a  rotational output vs. the pushrod which is a
> linear output. If you use large servo arms and have the connection further
> out on the servo wheel this gets minimized some...but you sacrifice
> resolution of your servos because now you have to dial back you rates too
> far to get the actual travel you want. I don't fly my D/R or my flying rates
> back below about 75%. The reason is you sacrifice the precision of the
> servo. I try to maximize my ATV values and keep the max out of the servo and
> TX resolution as possible.
> 
> To this end you will need about 30% expo just to get a linear output to the
> surface. I tend to run 40%-50% expo on Ailerons, about 40% expo on the
> elevator and about 60-70% expo on the rudder in my normal flying rates.
> 
> I would caution against high expo values like 60-100% you will get a hump in
> there and it will drive you nuts. Main thing you see is the roll rates don't
> stay constant...They start slow speed up and then finish slow. The reason is
> you are moving the stick so far before the surface responds.
> 
> Another note that may be significant to some. I fly one rate or Flight mode
> all the time. I have a upline snap rate (aileron +10%, elevator +10%,
> rudder -10% on the rates), this is only used for upline snaps where energy
> management is critical. And I have a spin mode or condition where the
> elevator rate is higher by 20-30% travel. This is until the break into the
> spin...then the spin is done on the flying rate. The spin mode has more expo
> on the elevator to give the same feel for flying as the normal flying rate.
> All other rates stay the same in the spin mode.
> 
>  All snaps (save the uplines), rolling loops, circles and maneuvers are done
> on the same rates. By the way these rate are all on the same switch and its
> easy to prepare for the upline snap. or spin entry...
> 
> I think that if I could get used to the higher aileron rate I could fly the
> upline snaps without a switch for these.
> 
> Hope this helps.
> 
> Troy Newman
> ----- Original Message ----- 
> From: <tph1 at bellsouth.net>
> To: <discussion at nsrca.org>
> Sent: Friday, November 19, 2004 7:30 AM
> Subject: Futaba radio question
> 
> 
> > When trying to make a control serface less sensitive around center do you
> add positive expo or negative expo?
> > thanks, Tom
> >
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