Wake Turbulence Question

I'd have to research the study.. but most wake turbulence only drops about
500ft.. if I remember correctly.. if you were 500ft it would not be an
issue..

also.. wake turbulence is the worst if the heavier aircraft (bizjet) is
configured for landing, flaps and gear etc.. if he was still gear up.. and
in level flight... the bumps would not be so bad even if you had 500ft. It's
the wing tip vortices that are the worst, and yes you may get some vortices
from the flap end at mid span.

We've rendezvoused for refueling, 1000ft below a heavy tanker (KC-10/DC10)
and moved into refueling position and not feel his wake until we are
practically on the boom.. at near cruise speeds

BT


"HankPilot2002" wrote in message
...
I was level at 1500' MSL and ATC announced a Gulfstream bizjet crossing
from my
right to left, 3000' MSL less than a mile lateral distance. I had my
instrument student do a 360 for wake turbulence separation and
dissipation.
ATC questioned my actions and told me the 360 wasn't necessary.

BTW: I was in Class Echo airspace in southern Maine.

I havent been instructing all that long but this did seem to me to be a
classic
wake turb encounter in the making. I am interested in hearing from other
pilots and CFII's on this subject. Was I over cautious ? Or prudent.....


Hank

"BTIZ" wrote in message
news:2fHIc.23345$r3.6120@okepread03...

also.. wake turbulence is the worst if the heavier aircraft (bizjet) is
configured for landing, flaps and gear etc.. if he was still gear up.. and
in level flight... the bumps would not be so bad even if you had 500ft.

A quote from a popular primary text:
"The greatest vortex strength occurs under CLEAN configuration, high weight,
and slow speed." (emphasis mine)

(... and high air density) Their contention appears to be that flaps and
gear help break up the vortex pattern. The clean configuration at slow
speeds results in the highest AOA, supposedly the primary culprit.

Thank you.. roger on the slow and high weight.. which equals high AOA which
create stronger vortices... fist time I've heard about gear and flaps
breaking up vortices..

as I said MY original response.. I'd have to go back and find the article I
read it from

BT

"Icebound" wrote in message
gers.com...

"BTIZ" wrote in message
news:2fHIc.23345$r3.6120@okepread03...

also.. wake turbulence is the worst if the heavier aircraft (bizjet) is
configured for landing, flaps and gear etc.. if he was still gear up..
and
in level flight... the bumps would not be so bad even if you had 500ft.

A quote from a popular primary text:
"The greatest vortex strength occurs under CLEAN configuration, high
weight,
and slow speed." (emphasis mine)

(... and high air density) Their contention appears to be that flaps and
gear help break up the vortex pattern. The clean configuration at slow
speeds results in the highest AOA, supposedly the primary culprit.

"BTIZ" wrote in message
newsK_Ic.259$gQ2.161@okepread03...
...snip...

as I said MY original response.. I'd have to go back and find the article
I
read it from



Since the post, I did a little googling, and found the FAA AIM has basically
the same quote:

http://www.faa.gov/ATpubs/AIM/Chap7/aim0703.html

7-3-3. Vortex Strength

a. ...snip... The greatest vortex strength occurs when the generating
aircraft is HEAVY, CLEAN, and SLOW.

(this time the emphasis is theirs)

"BTIZ" wrote:
also.. wake turbulence is the worst if the heavier aircraft (bizjet) is
configured for landing, flaps and gear etc..

According to the latest edition of the Aeronautical Information Manual
(effective 19 February 2004), paragraph 7-3-3:
"The greatest vortex strength occurs when the generating aircraft is
HEAVY, CLEAN, and SLOW." [emphasis present in original document]

A clean aircraft generates stronger wake vortices than does one
configured for landing.

Ace Pilot wrote:
"BTIZ" wrote:

also.. wake turbulence is the worst if the heavier aircraft (bizjet) is
configured for landing, flaps and gear etc..


According to the latest edition of the Aeronautical Information Manual
(effective 19 February 2004), paragraph 7-3-3:
"The greatest vortex strength occurs when the generating aircraft is
HEAVY, CLEAN, and SLOW." [emphasis present in original document]

A clean aircraft generates stronger wake vortices than does one
configured for landing.

Not necessarily. When it is landing it will be SLOW, which is
much more important than the minimal effect of how it happens
to be configured.
CV