See if you can figure out a placement on the landing gear for a simple
microswitch with a spring leaf for overtravel.---Hatz??

or make your own pressure switch , a diaphragm of thin glove leather , a
thin alum plate glued on one side to actuate a small
microswitch--microswitch will probably supply enough spring pressure to
return the diaphragm. They haven't found anything any better for wind
organ actuating mechanisms in a thousand years or so.--- WW-II airspeed
instruments used leather diaphragms in their airspeed indicators.You
should have a water trap in the pitot line anyhow.--wassbiplane


NEW-USER wrote:
Hello all, can somebody suggest a good place to get an air pressure
switch to hook into the Pieto line of an aircraft which will then in
turn operate the hourmeter when the aircraft is flying.

I have a friend who has a really long taxi and warmup time and he tells
me he is putting too many hours on these aircraft which are not from
actually flying. He wants to install a switch which will give him more
accurate times.

I have had a quick search of the Internet but unfortunately cannot find
exactly what we need (i think). Any help appreciated, regards Michael