Pic Dude wrote:
> Why can't you just use the pressure *inside* the aircraft
> for the static pressure (assuming it's not airtight)?  If
> so, then it would be really easy to do using any of the
> low-cost gauge or diff pressure sensors out there.

Cabin pressure may be positive or negative. A simple way to
get static pressure is the way many full size light A/C do.

Ram air pressure is a tube pointing straight forward outside
of the propeller wash. From a wing for example)  Static is
a tube in parallel to the RAM air tube with the end capped
and 3 or 4 small holes drilled in its sides. Both the tubes
and the hole sizes are non critical.

w..

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