1. I assume you mean 27-28” MP (throttle)
not RPM (prop)???
2. Can you achieve 38.5” MP at 25K
(i.e. full climb power)?
From: Lancair Mailing List [mailto:lml@lancaironline.net]
On Behalf Of Dr Andre Katz
pressure drops when the rpm is about 28 to 27 in mine, you have to keep
29 or better to maintain cabin
pressure in the standard setup for the 550 tsio in the IV-P