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Ground Effect  
User currently offlineMTOW From Sweden, joined Jun 2005, 0 posts, RR: 0
Posted (12 years 10 months 1 week 5 days 16 hours ago) and read 1632 times:

Do commercial airliners experience ground effect like GA aircraft do?

6 replies: All unread, jump to last
 
User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 10 months 1 week 5 days 16 hours ago) and read 1577 times:

Yeap.
Iain


User currently offlineC172Akula From Canada, joined Mar 2001, 1000 posts, RR: 4
Reply 2, posted (12 years 10 months 1 week 5 days 11 hours ago) and read 1546 times:

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!

User currently offlinePOSITIVE RATE From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 3, posted (12 years 10 months 1 week 4 days 21 hours ago) and read 1510 times:

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.

User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4195 posts, RR: 37
Reply 4, posted (12 years 10 months 1 week 4 days 16 hours ago) and read 1506 times:

Eh.. the 747 does have a flare, but it is more of an assumed pitch angle (like most large airliners) than a GA flare.


Chicks dig winglets.
User currently offlineDC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 2
Reply 5, posted (12 years 10 months 1 week 3 days 3 hours ago) and read 1465 times:

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.



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User currently offlineScooterTrash From United States of America, joined Aug 2001, 569 posts, RR: 9
Reply 6, posted (12 years 10 months 1 week 3 days 3 hours ago) and read 1462 times:

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


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