REFLECTOR: Better roll trim

[Rene Dugas]

Geoff,
What is the failure mode with run away motor or stuck switch?  
Rene'

Sent from Rene's iPad 3.


On Sep 2, 2012, at 7:22 PM, Geoff Gerhardt <geoff.gerhardt at gmail.com> wrote:

> Guys,
> 
> The parts from McMaster are shown below.  I just picked the longest belt they had, since the price didn't go up much per length and I was going to cut it, anyway, I thought I'd get one long enough so that I might have a second chance if I cut it too short.
> 
> Lou, I'm not sure if it stiffens it up that much.  I'm still a new Velocity pilot, but it seemed fine to me.  There's quite a range of springs in that size, so I suspect you would find one that is effective but not too stiff.  Its possible that it would have worked with the original springs - I went right to stiffer springs as I found that even pulling the original springs with my hand, it was not enough to move the ailerons appreciably (and mine move very freely).  But, on the other hand, I moved the spring attach point further out the bell crank arm, so maybe in that new position the original springs would have worked ok (didn't try the original springs in that position).
> 
> Geoff
> 
> 
> 1	1375K39	 Mxl And Xl Series Timing-belt Pulley, 1/4" Belt Width, .685" Od, 20 Teeth	 1
> Each	1	 0	$10.45
> Each	 $10.45
> 2	1679K683	 Trapezoidal Tooth Urethane Timing Belt, .080"pitch,trade Sz 482mxl,38.5"outer Circle,1/4"w	 1
> Each	1	 0	$6.14
> Each	 $6.14
> 
> 
> On Sun, Sep 2, 2012 at 7:39 PM, Lou Stedman <stedmanlou at roadrunner.com> wrote:
> Great looking system Geoff. I have felt mine was ineffective for a long time now. The one concern I have is the effect of the heavier springs on the feel of aileron control. Does it stiffen up the control? If so I am not sure I want that.
>  
> From: Geoff Gerhardt
> Sent: Sunday, September 02, 2012 9:34 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: REFLECTOR: Better roll trim
>  
> Guys,
>  
> I fixed my left roll tendency by improving my roll trim.  Basically, I replaced the rope/capstan with a timing belt/pulley system which allowed me to use beefier springs.  The roll trim now works very well.  Here's a pic of the roll trim motor fitted with the timing belt pulley.  More info on my website (http://thegerhardts.com/velocity/?p=547)
>  
> Geoff
>  
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