REFLECTOR: Slowing down elevator trim speed

[nmflyer1 at aol.com]

Scott.

I was told that the Mack grips have this brake in the switching system. Haven't tried it yet, but while wiring them it kind of looks like it. what kind of grip/switching system do you have? 

Ohh... Merry Christmas :) 

Kurt?? 


-----Original Message-----
From: Scott Derrick <scott at tnstaafl.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Wed, 24 Dec 2008 8:54 pm
Subject: Re: REFLECTOR: Slowing down elevator trim speed



The problem I experienced was the trim motor coasting.  Putting in a 
resistor does slow the motor down but it then requires longer 
application of trim at low speeds.

So i used a dynamic brake, which stops the motor immediately or there 
abouts, when you let up on the trim switch.

here is a simple diagram

http://tnstaafl.net/canards/Dynamic%20Brake.GIF

Here is an article on how its works including the diagram

http://tnstaafl.net/canards/trimbrake.jpg

I think I got this from Shawn Penning.

It helped a lot with high speed trimming and didn't effect the time 
needed to do those large trim changes needed at slow speeds.

Scott


Michael Watson wrote:
> I know this subject was discussed in the past, but I just can't find
> it in the TVBF archives and I don't want to reinvent the wheel.
> 
> Above 140 KIAS to obtain OOO level flight the trim is just too
> sensitive. One tap up from 5ft down on the VIS will result in
> a VSI reading of 10 to 15 ft up and visa verse. I recall someone
> placing a resistor/resistors in the trim power line to reduce the
> voltage to the trim motor. What value/wattage was used and
> was it effective?
> 
> 
> 
> 
> 
> -- 
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> Dual GRT EFIS
> 
> 
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