On Sep 7, 6:45*am, Peter Higgs wrote:

Perhaps the best initial solution would be to drill a 10-15mm hole in the
access cover, (or anywhere else really.) which depending upon the airflow,
would act as a static vent... *neither increasing or decreasing the ambient
pressure.


On Sep 7, 6:45 am, Peter Higgs wrote:
Perhaps the best initial solution would be to drill a 10-15mm hole in the
access cover, (or anywhere else really.) which depending upon the airflow,
would act as a static vent... neither increasing or decreasing the ambient
pressure.

I'm not sure I would want an "air spigot" pointing straight out of
the fuselage into the airstream - seems like unnecessary drag versus a
solution that lines the flow up with the external slipstream. The
reverse NACA duct has been shown to work well and it's my
understanding that it even produces a small amount of thrust.

As to altimeter readings - my altimeter is hooked to my tailboom
static ports. I'd recommend it as a general practice if you have
external ports available. My feeling is that any solution that vents
high-pressure fuselage air would yield a more accurate altimeter
reading than not venting but that the differences in any even aren't
that large.

9B