Re: wake turbulence

From:         nduehr@netcom.com (Nathan N. Duehr)
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date:         26 Jun 94 21:42:05 
References:   1 2
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Peter Lisner (plisner@mti.mti.sgi.com) wrote:

: The 757 has an incredibly high rate of climb. A takeoff in one of
: those (especially a noise abatement one!) is probably the most fun you
: can have in an airliner. They also descend much faster than most other
: aircraft on final approach. So this makes it harder for following
: traffic to stay above the flight path of a 757. This last statement
: sounds counter-intuitive, but what happens is that even though a
: following aircraft may be above the preceding one, the first aircraft
: was actually higher than the second one when it was at the same
: distance from touchdown earlier. So the second aircraft is below the
: wake still there from the first. There is a very good article about
: this in the latest (July I think) edition of "Flying" magazine,
: written by Richard Collins. Get a copy, and you will get a much better
: explanation than my clumsy attempt !

I never have figured out why everyone keeps promoting flying _higher_ 
than the approach path of the preceeding aircraft.  If we all did that, 
number 10 for the approach would be flying a 10 degree glideslope.

If wake vortices _decend_, then fly the _same_ approach path as the 
preceeding aircraft and touch down at or beyond where it touches down and 
you should not have any wake vortex turbulence, since it will have 
decended below your flight path by the time you arrive under standard 
separation.  Of course, if you accept a visual approach, the separation 
is now your repsponsibility, so don't tailgate!  (grin)


Just another $0.02 worth of noise on the net!
Nate Duehr

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