REFLECTOR: Slowing down elevator trim speed

[Scott Derrick]

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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