It works for me as well. The contrail has cast a shadow on the top of
the high cloud, giving the line a certain depth.
Contrails are the vapour trails left by jet engines flying above a
certain altitude and under certain conditions.
It is one of those joys of flying a fighter that you can be in
formation with your leader and during the climb his exhaust(s) suddenly
billow this white stuff. Of course it provides a tactical handicap if
you are about to enter a fight, real or training, and you aim to fly
below or above the altitudes at which you trail (called MINTRA as I
remember – minimum trail altitude) if you don't want to be spotted.
see http://homepage.ntlworld.com/booty.weather/FAQ/MR.htm#MINTRA
Chris
On 18 Jan 2005, at 23:28, Fernando Gonzalez Gentile wrote:
> I love those defects. Though I looked it up, didn't find the meaning of
> 'contrails' in my Oxford Advanced... , but I must say that at last
> you're
> using a red filter :^) Arethe previous ones withan R25 too?
>
> Fernando.
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