Great info, except the part about the static port. If the "atmosphere" pressure didn't have an effect on overall metering, the static port ("diaphragm cover") would not have a hole in it. No need for a hole unless the pressure does "something".....

As for pressure differences on that port causing performance differences.... there is absolutely NO doubt that if the static port "hole" is positioned so that direct ram air into the cowling is directed at that hole, it *will* cause a difference in transition richness/smoothness coming up off idle in flight. That difference is then exacerbated by AOA differences to the air flow in the cowling.

ANYONE who has a BME that has had the "problem" knows EXACTLY that running that static port "hole" into a relatively-calm, atmosphere-pressure area INSIDE the fuse solves problems.

Not to dispute ANY of the other information.... as Joe sez .... "It's about time for some concrete info", so Thank you!

Just wanted to clarify the static port issue.... it has a hole because it MUST sense "atmosphere" to get correct differential across the diaphragm.