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From: Jeff Edwards <vtailjeff@aol.com>
Subject: Re: [LML] Figuring out the pressurization system IV-P -- couple of questions
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D,

Your power setting was likely too low at 28 Inches to fully pressurize the c=
abin. 2300 rpm is also a very low number for climb. If you haven't already, I=
 would recommend getting a good Lancair instructor to assist in your trainin=
g.=20

Best regards,

Jeff Edwards
President LOBO

On Sep 5, 2011, at 4:14 PM, Dico Reijers <dico@internetworks.ca> wrote:

> Hi All,
>=20
> Today I was up flying and figuring out the pressurization system.  Things l=
ike if the annunciator panel / warning horn would sound if the "dump" switch=
 was in the on (don't pressurize position).
>=20
> As I climbed through 11,000' the horn and annunciator panel lit up.  I cou=
ld see that the system wasn't pressurized as the gauge indicated the cabin p=
ressure at pretty much the same as our altitude (we were at 11k and the cabi=
n showed 10k).   The dial was set to the 1000' field elevation.    I flicked=
 the dump switch and the cabin immediately began to pressurize (I could feel=
 it in my ears almost immediately after flicking the switch).  I then climbe=
d to 14000' to see how the system would react (Power setting 28" and 2300RPM=
).   At 14,000' the pressurization horn went off again as the cabin pressure=
 got to 10,000' again.  I realized that I forgot to change the dial to my cr=
uising altitude of 14,000', so I then dialed up 14000', thinking that the pr=
essurization system would then pressurize to that new altitude --- but it di=
dn't.  It just stayed at a cabin pressure of 10k.
>=20
> I have a couple questions... =20
>=20
> 1)  I presume the cabin pressurization should be set to my cruise altitude=
 BEFORE I get there as turning the dial to my cruising altitude after I get t=
here doesn't seem to work... is this right?
>=20
> 2)  People have told me that I should set the pressurization 1000' above m=
y actual cruising altitude and field elevation on landing... is this right? =
 Whats the logic here?
>=20
> Thanks,
>=20
> Dico