John wins the prize. In the days before engine driven vacuum pumps, a
venturi was used to provide vacuum to spin up gyroscopic aircraft
instruments - usually the attitude and directional gyros. The down side
was that the instruments didn't become "live" until you built up speed
going down the runway and if you encountered icing conditions they iced
up and you lost your instruments.
Here it is in living color...
http://studio1941.com/koken/albums/pdml-peso/content/natl-air-tour-10a/
On 12/29/2016 12:54 PM, John wrote:
Venturi to provide air to an air-driven gyroscopic instrument.
On 12/29/2016 12:21 PM, Paul in MKE wrote:
Twelve Attaboys for the first to identify this...
http://studio1941.com/koken/albums/pdml-peso/content/nat-10a-sketch/
-p
--
Being old doesn't seem so old now that I'm old.
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