AeroElectric-List Digest Archive

Thu 12/15/16


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     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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    Time: 09:50:13 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    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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    Time: 07:00:32 PM PST US
    Subject: Re: Trim position indicator
    From: "donjohnston" <don@velocity-xl.com>
    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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