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Originally posted by weedwhacker
Somewhere there is a graphic that shows the flow patterns behind engines....of course, this refers to engines on the ground, since that is the real 'problem' of 'jet-blast'....
Originally posted by Zaphod58
If you had actually READ any of the links we have posted, jet blast comes out of the exhaust in a cone of approximately 20 feet wide from the back of the engine IIRC. .
Originally posted by C0bzz
I already did correct you. The most wake turbulance is created when the aircraft is CLEAN, HEAVY, and SLOW.
Originally posted by weedwhacker
There is more, but it's buried in my Flight Manuals. You can ask the line pilots for a copy of their pages, if you get the chance....
Originally posted by weedwhacker
The worst 'wake turbulence' is produced when the airplane is heavy and slow, with flaps and slats extended, especially in the 'landing' config.
Originally posted by weedwhacker
There is more, but it's buried in my Flight Manuals. You can ask the line pilots for a copy of their pages, if you get the chance....they'll know what you mean. In fact, why not copy as much as you can, then post it?
Originally posted by weemadmental
your are twisting and changing your story to allow you to continue, .
Originally posted by Pilgrum
At what point would the blast of the engines at full throttle be directed at an angle toward the ground?
Airport signs at certain critical locations at O’Hare International Airport and other major U.S. airports are being sheared off their mounting legs at the frangible coupling from aircraft jet engine blast and/or wake turbulence forces.
Originally posted by ULTIMA1
You keep forgetting about the jet blast having at least a 20 foot diamter around the exhaust.
So these statments about the blast of the engines being angled at the ground are void.
Originally posted by Pilgrum
Let's consider your figure of a 20' diameter for the blast which would be around the centreline of the engine and widening, therefore getting weaker as it gets further away from the engine.
Originally posted by Pilgrum
reply to post by weedwhacker
If I can call on your experience actually flying these beasts and not that you'd ever consider doing such a thing, but try to picture the disputed 757 coming in cleanly at high speed and descending in order to hit its intended target. At what point would the blast of the engines at full throttle be directed at an angle toward the ground?
To my knowledge of flying, admittedly limited, the engine blast could only be directed at the ground if the plane was stalling or attempting to gain altitude again. At the suggested speed the attitude of the plane would be a little nose-down to overcome ground effect which would angle the blast upward from the horizontal which is logical as you need a vectored downward force to overcome the resistance to descent so close to the ground.
Or am I way off target here?
Originally posted by Zaphod58
And again, you are talking about a plane that is on the taxiway, sitting on the ground, where jetblast WILL damage objects and cause problems like that.
Originally posted by weedwhacker
In flight, of course, what is encountered is the 'wake turbulence'....this is a common term to describe the wingtip vortices, produced while in flight.