[NSRCA-discussion] Random tip on ATV and setup

[Ron Van Putte]

Good stuff Don.  I do the very best job I can mechanically to get  
proper centering and throws, with ATVs and AFRs set to 100%.  Only as  
a last resort do I use the sub trims.

BTW, MANY years ago there was a young Don Szczur I almost beat in a  
contest at Atlanta.  I was flying a brand new, pristine Atlanta.  Don  
was flying a beat up Curare, with hangar rash everywhere.  We flew  
six rounds.  I won the first three rounds and he won the last three.   
He beat me on the fourth, counting round score.  Sigh......

Ron

On Feb 19, 2009, at 7:32 PM, tocdon at netscape.net wrote:

> Sub trim is a function that moves the servo to get the control  
> surface centered. This in conjunction with end point adjustments  
> can have an adverse effect on servo speeds. You are basically  
> stretching the number of steps for the same amount of travel, among  
> the servos. I was at the FARM club helping out a giant scale newbe  
> last fall and he was flying a third scale H9 Extra 330 with Futaba  
> 8 channel and Hitec servos. One of his servos literally trailed the  
> other one by about 20 or so degrees when moving the elevators up  
> and down in a rapid fashion. He said a servo was bad. Actually,  
> backing up a bit- when he was flying he asked my help to trim his  
> plane and handed me the transmitter . When I tried some waterfalls,  
> it peeled off really bad. When I landed, that is when I saw the  
> elevators moving at different speeds. Upon inspection I found he  
> used the electronic sub trim to get the servos aligned and massive  
> atv end point to get the ends the same throw. He also had the ATVs  
> set at nealy 150 percent. I think he was like, off one complete  
> servo arm tooth and used the sub trim to get the servo back to  
> center. After about 2 hours getting everything mechanically  
> adjusted, the plane flew so much better. It went from something  
> nearly crashing to a competitive IMAC and 3D setup. Any case, I had  
> an identical experience when helping a flyer in Vanceboro, NC last  
> year (after the pattern contest completed). Exact same issue on his  
> (scal e) plane. He thought the Rx was bad until I showed him what  
> the deal was. After mechanically adjusting to get it close, all was  
> well.
>
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