Message: 4
Date: Fri, 2 May 2008 07:42:44 +0930
From: "swk" <[EMAIL PROTECTED]>
Subject: Re: [Aus-soaring] Waynes Rule
To: "Discussion of issues relating to Soaring in Australia."
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Wayne,
saying a parcel of air rises because it is warm OR rises because the cooler
air around it forces it up is describing the same thing, except from
different view points.
Your "rule"
"A parcel of air cannot rise away from the earth by itself as it has a
mass, this mass is acted apon by gravity"
is trivially true, but not a useful statement.
A parcel of air cannot _exist_ _by itself_
Regards
SWK
Stephen, you are right, the result is exactly the same.
Its interesting that glider pilots are one of the few groups who can grasp this.
Most think that because they see the result and know the trigger, they
understand the concept.
Actually its in reverse to what most people think, although the thermal is
triggered by something, the work is produced by gravity.
Wayne
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