Mailing List lml@lancaironline.net Message #2574
From: Bob B <rab22@bigfoot.com>
Subject: Airspeed switch
Date: Fri, 11 Jun 1999 22:39:52 -0700
To: <lancair.list@olsusa.com>
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Well, I did it!    Its a long story with many excuses, but the bottom line
is I left my gear switch in the up position and turned on the master
switch.   Before I could react, the nose wheel partially retracted and broke
my 3-blade propeller.   The prop saved the cowl from any damage.

While I was waiting for a new propeller, I installed an airspeed sensitive
switch in the pitot line.    The switch is adjustable  All you have to do is
put a piece of vinyl tubing on the pitot tube and blow into it, watching the
airspeed indicator and an ohmmeter to show when the switch actuates.  You
can also hear the switch click.  A few turns of the adjustment screw sets
the trip point to 70 knots, or whatever speed you like.

The switch is rated at 3 amps and is easily wired in series with the "up"
wire from the gear selector switch.  

The switch is available from Ellison Fluid Systems for $62.75,  a
description can be found on their web site
http://www.ellison-fluid-systems.com/accessories/accessories.htm

Many Lancairs already have such a switch installed,  if you don't, think
about it.  
I didn't believe I would ever do such a dumb thing either!

Bob Belshe
N19BJ  Lancair 235/320,  Flying again
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