REFLECTOR: Slowing down elevator trim speed

Michael Watson mikewatsspg at gmail.com
Thu Dec 25 19:25:54 CST 2008


Thanks All and Happy Holidays. (politically Correct).

I do have a Mack system and it dose not have that feature.
Anyway, I found the threads and Scott's diagram seems
promising. I was also told that using a 24 V Pitch Trim
will accomplish the same results.


On Thu, Dec 25, 2008 at 10:47 AM, Scott Derrick <scott at tnstaafl.net> wrote:

> 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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>
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>



-- 
Mike W.
1997 Velocity Elite RG
Franklin /IVO Electric CS
Dual GRT EFIS
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