Originally posted by waypastvne
Originally posted by anoncoholic
regardless what altitude you seem o think makes that difference. .
Silly truther, 740 feet per second is a velocity not an altitude.
740 fps would be subtracted from the engines exhaust velocity in relation to the ground. The exhaust coming out of the engine would be pretty close to
standing still in relation to the ground.
You need to learn the difference between static and dynamic thrust.
edit on 19-10-2011 by waypastvne because: (no reason given)
silly makeup artist the difference between ground speed and airspeed is not determined by exhaust gas being expelled but the difference between the
distance traveled in air vs the distance traveled on ground. But the point is what you yourself made in the above.
IN RELATION TO THE GROUND
example, a head wind will increase travel time and decrease air speed. This however has nothing to do with jetwash as the velocity of the exhaust will
remain a constant and the only thing that could change its speed is throttling up or down. The ability of air to accept change is why jet thrust is
such a poor means of propulsion since air like a fluid will adapt to change.
Now the issue I am raising isn't whether that change is evident in a plane in flight, that is without dispute, however, when that flight is at ground
level as it had to be to strike the ground floor, then the ground itself isn't air that will adapt to change hence my remark about altitude and yet
all you see is a chance to try to poke fun at logic by scrambling the issue with unrelated facts.
The fact is, ground is not air and will not yield (but evidence of its attempt to is NOT evident is my entire point) therefore the airflow out of the
jet engine, its thrust, is not much difference to being parked on solid ground where the air has no place to move downwards as the fantail disperses
but is focused straight back and up. It is that force down that I am talking about and 58,000 lbs (partial) thrust is not changed by motion Ground
doesn't move to decrease affect
Now getting back to the video of the vehicles (the second one I posted is better as it actually goes on to explain that any more than 20 seconds will
peel the runway) that 58,000 lbs thrust is irrelevant to headwind or tailwind, it is a force of its own yet by your reasoning that force is dependent
upon distance traveled and the time taken (velocity) and not at what height the thrust is which is blowing smoke as far as reality of why there is no
evidence of jetwash on the grass.
Now I didn't reread my comment to get context of how I meant the comment as I still know how it is meant. The altitude of the plane is irrelevant to
the grass when that plane had to be at ground level to hit the ground floor and yet as mentioned above I too recall pilots stating a jumbo jet will
not fly at ground level as it has no air under its wings to generate lift and yet again, that attitude is absent in the markings on the ground which
not only would have been peeled grass but more than likely a long trough as the plane skidded into the building rather than glide or fly at full
thrust and we have to assume full thrust by logic of a terrorist seeking full impact potential.
Now why is simple logic being challenged with trivial facts whether the test was static or dynamic when the grass doesn't care. Grass only cares
about two things, manifestation of growth and change in growth pattern. It doesn't care about air speed it cares about thrust that threatens its
growth and yet that evidence of change is absent which is the entire point isn't it?
no matter. You lot have it all figured out so who am I to challenge your reality? Whether it is feasible isn't the issue, what is the issue is that
according to your solution there can never be a solution as there is nothing to see here, move along.
Why can't you see the direction? You need a moral compass. 3000 dead that day and millions since and counting and yet you would rather dismiss all
Sorry, I can't look the other way and pretend
w/e, I said what needed to be said and at the least the issue isn't dead like the futures of so many or the direction humanity is embarked upon.
Why not just start the damn war and kill as many in a single shot? Man has perfected killing and we all know you love your toys and want to use them
every chance you get.
Shameful and a disgrace in abuse of power and responsibility never entered the equation as there is no morality in your math.