On Wed, 13 Jul 2005 15:58:46 -0400, "Peter R."
wrote:

Peter Clark wrote:

Assuming we're talking about KUDD, 73' elevation, 40 deg C temp,
altimeter 29.79, I come up with pressure altitude of 190' and density
alt of 3050.

Hmmm, I keep arriving at a DA about 1200 feet higher. Cross checking this
with several DA calculator websites confirms about 4,200 ft or so.

Hm. I'm using
http://www.asa2fly.com/category1.asp...ategory_ID=179

Perhaps there's a code error in their online CX-2 program? Or maybe
I'm doing something wrong. Flight/Alt/Press alt, give it field
elevation and altimeter. Flight/alt/Density alt, it auto-feeds the
press alt over, give it temp, comes with 3049. So does my real E6-B
that I just dug out? Looks like you need a pressure alt of 1500' or
so to get a density alt of 4200' or so.