>>I've seen condensation above a 757 wing right after takeoff
This is common. I think that this is an air pressure phenomenon where
near-saturated air goes to supersaturated whne the pressuer is lowered.
Which is what you would expect on the top of a wing at high AOAs. Remember
your mad scientist days when you made a Milliken cloud chamber.
Another visual example is in the movie "True Lies", where there is a aerial
sequence of Harriers doing tight turns near sea level-- the vapor clouds in
low pressure areas were frequently visible.
--Bill (back to the bandwidth conservation mode)
>From: Brett Jaffee <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: Mark Drela <[EMAIL PROTECTED]>
>CC: [EMAIL PROTECTED]
>Subject: [RCSE] Re: [RCSE]
>Date: Fri, 03 Aug 2001 19:01:19 -0700
>
>Mark Drela wrote:
>
> > Yes and no. The conical shape is typical of transonic flow.
> > But moisture can condense near much slower aircraft.
> > All that's needed is very high humidity, from which
> > you get condensation with only a slight drop in pressure.
>
>At the Pt Mugu airshow in southern California its pretty common to see this
>sort of thing on any airplane making a fast fly by (say, over 600 mph).
>Being that the base is right on the ocean, it's typically overcast or foggy
>whenever they've had an airshow.
>
> >
> > I've seen condensation above a 757 wing right after takeoff
> > when we climbed through a very low cloud base (which is
> > a 100%-humidity boundary).
>
>I saw this very thing from the ground near LAX last week. It was pretty
>spectaclur, given that the entire wing erupted in a vapor cloud. I think
>high angles of attack have a lot to do with it. I've seen pics of the
>Concorde coming in for a landing with it's entire wing obscured in vapor,
>and fighter planes also show these effects sometimes when the pitch up hard
>to climb or turn.
>
>Brett
>
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