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- Path: sparky!uunet!gatech!destroyer!gumby!wupost!waikato.ac.nz!aukuni.ac.nz!cs18.cs.aukuni.ac.nz!mken1
- Newsgroups: rec.models.rc
- Subject: Re: Thermals don't travel at prevailing wind speed
- Message-ID: <1992Jul28.220353.2768@cs.aukuni.ac.nz>
- From: mken1@cs.aukuni.ac.nz (Mark Steven Kendall )
- Date: Tue, 28 Jul 1992 22:03:53 GMT
- References: <1992Jul23.221308.24156@bcrka451.bnr.ca> <1992Jul28.042041.926@nntpd.lkg.dec.com>
- Organization: Computer Science Dept. University of Auckland
- Lines: 28
-
- In <1992Jul28.042041.926@nntpd.lkg.dec.com> fisher@kay.enet.dec.com (kay::fisher) writes:
-
- >The same way bubbles get to the surface of a river. If they only
- >went down stream they would never come up. If they come up then
- >obviously they aren't going down stream as fast as the rest of the
- >river.
-
- Say what!
- Haven't you heard that horizontal motion and vertical motion usually occur
- independently, by your assumption if someone jumped out of a fast moving plane
- (going horizontally) they would fall slower than someone who jumped out of
- a stationary plane (ie stalled or equivalent). I think NOT!!
-
- As to why thermals don't travel at prevailing wind speed, in my experience they
- generally do. It may not be the same speed as the wind on the ground, but that
- doesn't mean that the wind is the same up higher. If the thermal is produced
- by a cloud I presume that the wind loses some force when trying to move a cloud
- and therefore the cloud travels slightly slower than the wind. The other type
- of thermal I have flown in doesn't go anywhere, normally caused by something on
- the ground, the wind just affects where it is at a certain height.
-
- Mark
-
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