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Wake And Stability  
User currently offlineRamerinianair From United States of America, joined Nov 2003, 1489 posts, RR: 0
Posted (11 years 4 weeks 1 day 12 hours ago) and read 2246 times:

I read quite a few threads and articles on findings about AAs incidents with their A300s. After pinning the lastest incident on the pilots, I am wondering how bad the wake was.
How much wake could the 747 cause, what/ how bad is the effect
How much wake can an A/C take

W N = my Worst Nightmare!!!!!
6 replies: All unread, jump to last
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17422 posts, RR: 66
Reply 1, posted (11 years 4 weeks 22 hours ago) and read 2060 times:

How much wake could the 747 cause, what/ how bad is the effect

Enough to flip a small aircraft and make it crash without any problems if close to the ground. This is true of all heavies and the 752.

How much wake can an A/C take

Depends on the weight, the speed and the distance.

Large aircraft are less wake sensitive, but generally you want to have at least 120 seconds separation and pilots will choose to stay out of the wake if they can of course.

"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineStaffan From , joined Dec 1969, posts, RR:
Reply 2, posted (11 years 4 weeks 22 hours ago) and read 2058 times:

Here are some photos showing the wake on some different a/c.



User currently offlineRamerinianair From United States of America, joined Nov 2003, 1489 posts, RR: 0
Reply 3, posted (11 years 4 weeks 18 hours ago) and read 2039 times:

WOW! Great guys. Thanks for the replies, the pics were really cool. Didn't realize how bad this wake could be.

W N = my Worst Nightmare!!!!!
User currently offlineQantasA332 From Australia, joined Dec 2003, 1500 posts, RR: 22
Reply 4, posted (11 years 4 weeks 17 hours ago) and read 2031 times:

An aircraft's wake strength is mainly dependant on the "strength" or intensity of its wingtip vortices. As these vortices are a product of the pressure differential that keeps multi-hundred-thousand-kilo aircraft airborne, you can expect the wake to be quite strong!


User currently offlineWakeTurbulence From United States of America, joined Apr 2004, 1318 posts, RR: 15
Reply 5, posted (11 years 4 weeks 17 hours ago) and read 2024 times:

Several years ago the owner of In and Out Burger was in a charter jet on final for SNA behind a 752. The separation was not enough and the a/c went down about 5 miles from the runway killing all on board, the a/c that crashed was probably between 12,000 - 16,000 lbs depending on fuel. So wake can drastically affect many different types of a/c.

Here is a pic of the type of a/c.

User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 66
Reply 6, posted (11 years 4 weeks 16 hours ago) and read 2031 times:

It is my understanding that the separation was adequate in terms of the required time or distance. The problem was initiated by the 747 making a wide turn out and the A-300 cutting across the inside of that turn. Had it not done so, but followed the same track as the 747 the better-performing two-holer would have been above the vortices of the 747 all the way.

And yes, it can be really really bad.

I've been rolled right square upside-down at about 600' on final into LAX. I was flying a Cessna 402 at the time and the turbulence was caused by a 727. Had I known I was going to roll that far I'd have put aileron in the same direction and just gone a full roll. As it was I was fighting the roll all the way over and back.

A friend crashed in the wake of a 747. I looked at the wreckage of his Cessna 206 and I'm almost convinced that the left wing, strut, and door frame were coming off the plane before he hit the ground, torn off by the vortex. I might be wrong about this, but the wing and door frame were still a single unit with almost no other damage except having been ripped from the side of the Cessna.

Happiness is not seeing another trite Ste. Maarten photo all week long.
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