posted on Sep, 10 2011 @ 01:13 AM
Originally posted by shaolin_dragon
If my basic aircraft info is still accurate..as much as i can remember anyway...heres what the arrows represent..i could be off though..so let me
The red arrow represents Thrust. It can come from one of two sources...either a prop blade powered by an engine of some kind, or a rocket engine.
The yellow arrow represents drag.
The green...if the plane was right side up, would represent Weight
The blue...again..if it was right side up, would represent Lift..
Because the plane is inverted, these roles are reversed..hence the green is now Lift, and the blue is now Weight
The black is Gravity
Am I right?
Not bad,mostly right.
The red arrow represents thrust. The two sources of energy that can produce thrust are engine power and gravity. (A gliders forward motion comes only
from gravity. when you point the nose of a plane down it speeds up)
The yellow arrow represents drag. The two sources of this force are aerodynamic drag (parasitic and induced) and gravity (when you point the nose of a
plane up it slows down)
The blue arrow represents lift. This force comes mostly from angle of attack (angle of wing in relation to relative wind) and also from the low
pressure created by the airfoil. Flt 93 was pulling .64 G's positive just prior to impact. so the wings were producing lift in the direction of the
The green arrow in this case represents Inertial acceleration (also known as G force, angular momentum, Centrifugal force,ect) this force is produced
by a change in the angle of attack (aircraft carving a curve in the pitch axis) and was producing a force equal to 64% of the aircrafts weighting in
the direction of the green arrow.
The black arrow represents gravity. This force comes from the gravitational pull of the earth, and is always directed at the earths centre of mass
regardless of the aircrafts attitude. The earths gravitational pull is constant it never goes away. It can be negated by Inertial acceleration (0 G's,
negative G's) but it is always there.
Next we should take a look at how the forces interact on the airframe, just prior to impact.
Thanks for answering for ATH911, I don't think he would of ever gotten it.
edit on 10-9-2011 by waypastvne because: (no reason given)