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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>>
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