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Originally posted by worldwatcher
fix your link:
www.BWAHAHA.funtigo.com...
question: how popular is the aurora? I have seen similar trails here in south florida
Originally posted by Thomas Crowne
Except that the suspected Aurora contrail photo has evenly spaced donuts, which is certainly not indicative of natural occurance, but might make one think that they are caused by pulse detonations, huh? Possibly?
originally posted by: aerospaceweb
My opinion is that none of the photos in that gallery have the classic "donuts on a rope" structure that has been proposed for such a propulsion system. Instead, it looks like a typical contrail formed by your average subsonic commercial or military aircraft. The contrail doesn't have the periodic well-defined puffs shown in other photos that are supposedly created by an Aurora-like craft. This just looks like the standard turbulent "fuzy" structure you'd expect of any contrail as it spreads out over time. See below for examples.
www.royal-met-soc.org.uk...
[Edited on 23-5-2004 by aerospaceweb]