What is this sound?

What you're hearing is the wingtip vorticies. A really powerful one sounds
like someone ripping a bedsheet in half.

My office used to be adjacent to the final approach to Rwy 7 at KSBA, and
I have observed this phenomenon on numerous occasions. Often a sound like
fabric being torn. There was a row of trees parallel to the approach, and
these would often be thrashed about violently when the vortices hit them.
There was also a corrugated steel "vanity wall" (to hide the air conditioning
equipment) on top of an office building - likewise parallel to the approach.
Often the vortex striking this structure would make a sound like it had been
hit with a sledgehammer.

I know that there are those hereabouts who will dispute this, but it is my
observation that airplanes with winglets produce more violent wingtip
vortices than those without.

David Johnson

In article , David
Johnson wrote:

I know that there are those hereabouts who will dispute this, but it is my
observation that airplanes with winglets produce more violent wingtip
vortices than those without.

B757's and B767's are known for their violent votices; even the 10 mile
spacing mandated by the FAA is not always sufficient to keep trailing
aircraft from being bounced (especially light, GA aircraft).

"Michelle P" wrote in message

Can you get a recording?

GREAT idea! That's kind of a forehead slapper, actually.

-c

"gatt" wrote in message
...

"Michelle P" wrote in message

Can you get a recording?

GREAT idea! That's kind of a forehead slapper, actually.

Gotta be a directional deal. Your standard mic would suck.

I'd look forward to hearing that.

--
Jim Fisher

"EDR" wrote in message
...

B757's and B767's are known for their violent votices; even the 10 mile
spacing mandated by the FAA

What 10 mile spacing? There isn't 10 mile spacing for any two aircraft.