Today's Message Index:
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1. 09:50 AM - Re: Trim position indicator (Robert L. Nuckolls, III)
2. 07:00 PM - Re: Trim position indicator (donjohnston)
Message 1
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Subject: | Re: Trim position indicator |
At 06:51 PM 12/13/2016, you wrote:
>how about a servo potentiometer geared to the idler pulley
>
>On Dec 13, 2016, at 19:30, Matt Dralle
><<mailto:dralle@matronics.com>dralle@matronics.com> wrote:
>
>
I've been mulling this over the past few days.
Had to spend a lot of time on the road . . . good
opportunity for sifting the seeds of ideas.
That idler pulley seems the opportune
location for tapping into trim system position
data. With a little creating work on a small
lathe, you could remount that pulley on
a shaft supported by a bushing extending
through the mounting surface. Is there room
behind that bulkhead to mount a potentiometer?
It seems likely that full stroke travel of
the trim system will not produce more than 10
revolutions of the idler pulley. The pot
would be rigged to produce 50% of full scale
voltage with the trim system mechanically
neutral.
Simple electronics can offer electrical adjustment
of the pot voltage should mechanical neutral be
offset from aerodynamic neutral.
If you had a voltage representing trim postion,
where/how would you display it?
Bob . . .
Message 2
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Subject: | Re: Trim position indicator |
nuckolls.bob(at)aeroelect wrote:
> At 06:51 PM 12/13/2016, you wrote:
>
> That idler pulley seems the opportune location for tapping into trim system position
data. With a little creating work on a small lathe, you could remount
that pulley on a shaft supported by a bushing extending through the mounting
surface. Is there room behind that bulkhead to mount a potentiometer?
>
> Bob . . .
Yes, that would be an elegant solution. There's plenty of room on the forward
side of the bulkhead. However, I don't have access to a machine shop. :(
The position data would be sent to the VPX. It has inputs that can handle the Ray
Allen position sensors which then displays it on the GRT HXr EFIS.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=463960#463960
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