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Ground Effect

Posted: Mon Oct 22, 2001 12:17 am
by MTOW
Do commercial airliners experience ground effect like GA aircraft do?

RE: Ground Effect

Posted: Mon Oct 22, 2001 12:34 am
by Guest
Yeap.
Iain

RE: Ground Effect

Posted: Mon Oct 22, 2001 4:43 am
by c172akula
The ground effect is there, but I assume they just go rocketing right through it with all of their power. Whereas us GA guys love to fly in it, pick up speed and do a nifty little pull up!

RE: Ground Effect

Posted: Mon Oct 22, 2001 6:53 pm
by POSITIVE RATE
Ground effect is there for a commercial airliner absolutely! If anything it is stronger because jetliners have much larger wings than GA a/c and sometimes they do float and float and float. Some jetliners like the 747 have no flare though and they simply fly straight onto the runway.

RE: Ground Effect

Posted: Tue Oct 23, 2001 12:13 am
by XFSUgimpLB41X
Eh.. the 747 does have a flare, but it is more of an assumed pitch angle (like most large airliners) than a GA flare.

RE: Ground Effect

Posted: Wed Oct 24, 2001 12:49 pm
by DC-10Tech
I've heard the 747 has a very nice and noticeable ground effect. The DC-10 supposedly isn't too bad at flaps 50 either, although I can say from experience I've rarely rode in the cockpit on a smooth landing.

RE: Ground Effect

Posted: Wed Oct 24, 2001 1:18 pm
by ScooterTrash
If I remember my basic aerodynamics correctly it goes something like this...

Ground effect is essentially the reduction of induced drag (the force that wants to slow you down) due to the ground interference with the formation of wingtip vortices. Since you essentially reduce the total drag on the airplane, the forces of thrust, and to some degree lift, are experienced to a greater degree. That's why the airplane "floats" as it nears the ground.

Ground effect is begins to be experienced within approximately 1/2 the wingspan of the ground, that is to say if the wingspan is 100 feet, the ground effect begins at about 50 feet.

Since air carrier aircraft have such large, efficient airfoils, they feel ground effect to a greater degree than do many GA airplanes.

Regards, ScooterTrash