----- Original Message -----

From: Mark Steitle

To: Rotary motors in aircraft

Sent: Monday, February 02, 2004 3:13 PM

Subject: [FlyRotary] Re: Linear Position Transducer?

Ed,
Could you use something like this... http://mpja.com/productview.asp?product=14579+RS

Mark S.


At 01:36 PM 2/2/2004 -0500, you wrote:

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