REFLECTOR: Slowing down elevator trim speed

Scott Derrick scott at tnstaafl.net
Thu Dec 25 09:47:35 CST 2008


Can't remember the manuf. of my grip, its wooden, made for right hand 
and has a hat switch and 2 PPT switches.

The brake wiring was definitely not in the grip, I installed two relays 
  to accomplish that, which I have recently removed, when I installed 
the Strong Pitch Trim System.

Scott


nmflyer1 at aol.com wrote:
> 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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