Ask Bob Nuckolls in a pvt e-mail.  He may well be able to point you in the
right direction.

David

----- Original Message -----
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 02, 2004 12:36 PM
Subject: [FlyRotary] Linear Position Transducer?


Hi Guys,

    I am finishing up the design and fabrication of my variable length EDDIE
intake and need some assistance.  I want to use a voltmeter (or LEDs) to
indicate the postion of the manifold.  The simplist approach would appear to
have a linear resistor attached such that its arm is moved as the manifold
moves thereby changing the resistance indicating distance.

I've done a lot of Web surfing and found a number of linear postion
potentiometers.  The problem is they cost more than I have invested in the
manifold.  Regular audio linear potentiometers do not have the mechanical
range I need.  I need a position indictor that has at least 5 1/2 - 6" of
travel.  Anyone have any ideal where something reasonably priced might be
found.

 If you know of a retail catalog that have such things I'd appreciate a
pointer.  I can find plenty of Linear Postion Potentiometers - but they cost
in the hunderds of $$.  Need something much cheaper.

I know I could devise a 3:1 lever ratio or some such thing and use one of
the cheap (but mechanically range restricted) linear potentiometers for
audio circuits, but would rather not.

Thanks


Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC