REFLECTOR: Altimeter v. Airspeed

Chuck Jensen cjensen at dts9000.com
Sun Jan 6 09:02:49 CST 2008


Tom, I don't have inleakage.  Mine is so tight that I don't let people smoke because the cabin would fill up with smoke and I wouldn't be able to see. :-).

In all seriousness, the only way there can be inleakage (and I have plenty, but less then I used to) is if there is outleakage, otherwise my Velo would be known as a P-Velo.  Given the relatively small amount of inleakage and ample pathways for exit, namely the gear leg area on an RG (assuming this is a net negative pressure area), it would take a pretty big inrush to pressurize the cabin to any noticeable degree.  Certainly, if the whole fuselage created a low/high pressure area, then the cabin static pressure could be influenced.  

Ron's idea of the low altitude, high speed pass, would confirm the altimeter indication which currently agree with the GPS altitude (even though those are not always exactly coincident).  I can't imagine TYS tower would have any objections to a 200 kt pass down the runway with a near vertical pull up to bleed off airspeed to stay in the pattern.  :-) :-)

Chuck Jensen


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
Behalf Of Tom
Sent: Sunday, January 06, 2008 9:29 AM
To: reflector at tvbf.org
Subject: REFLECTOR: Altimeter v. Airspeed


Chuck, I'd be worried that with the substantial leakage into the cabin 
that Velocitys tend to have, that the internal cabin pressure would be 
somewhat higher than ambient. Tom
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