"Seeking Foreign Buyers For Osprey"

On Jun 15, 11:47 am, Pat Flannery wrote:
Vince wrote:

they have noticed that

What they should have noticed is how that side-by-side rotor layout
causes sand and dust to rise around the fuselage during landing,
blinding the pilot.

This differs from any other rotary wing craft how?

"5/9/2007 - EGLIN AIR FORCE BASE, Fla. -- The Air Force Research
Laboratory Rapid Reaction Team has successfully integrated and tested
a science and technology solution to the Air Force Special Operation
Command helicopter brownout problem.

In late 2005, Lt. Gen. Michael Wooley, AFSOC commander, asked the AFRL
commander to find a solution to a problem that is killing his Airmen
-- rotary wing brownouts.

More than 30 AFSOC rotary wing aircraft and 60 servicemembers have
lost their lives due to reduced visibility conditions during landing
in desert environments. Many of the aircraft losses have been
attributed to a condition that helicopter pilots refer to as
"brownout."

"Brownout conditions occur during landing and take-offs from sand or
dirt. The sand and dirt is blown up off the ground and blinds the
helicopter pilots to the surrounding area, much like being in a
whiteout during a blizzard," said Eric Werkowitz, the effort's program
manager who is from the Munitions Directorate here. "

BB

I guess everybody has some mountain to climb.
It's just fate whether you live in Kansas or Tibet...

BlackBeard wrote:
On Jun 15, 11:47 am, Pat Flannery wrote:
Vince wrote:

they have noticed that
What they should have noticed is how that side-by-side rotor layout
causes sand and dust to rise around the fuselage during landing,
blinding the pilot.

This differs from any other rotary wing craft how?

very very high disk loading with yaw effects


6. HIGH DOWNWASH VELOCITY

Because of the high disk-loading of V-22, the downwash velocity is about
twice that of any conventional helicopter, and because of the
side-by-side placement of the prop-rotors there are two distinct
downwash wakes that are transverse to the flight direction. This has
several operational implications that bear on safety issues. The most
critical one, I believe, is the effects of downwash on landings at night
in a desert environment – a challenge in any helicopter, but more
difficult, and potentially dangerous, in the V-22.

http://www.g2mil.com/V-22safety.htm

Vince wrote:
BlackBeard wrote:
On Jun 15, 11:47 am, Pat Flannery wrote:
Vince wrote:

they have noticed that
What they should have noticed is how that side-by-side rotor layout
causes sand and dust to rise around the fuselage during landing,
blinding the pilot.

This differs from any other rotary wing craft how?

very very high disk loading with yaw effects


6. HIGH DOWNWASH VELOCITY

Because of the high disk-loading of V-22, the downwash velocity is
about twice that of any conventional helicopter, and because of the
side-by-side placement of the prop-rotors there are two distinct
downwash wakes that are transverse to the flight direction. This has
several operational implications that bear on safety issues. The most
critical one, I believe, is the effects of downwash on landings at
night in a desert environment – a challenge in any helicopter, but
more difficult, and potentially dangerous, in the V-22.

http://www.g2mil.com/V-22safety.htm

In something like the Chinook, the twin rotor down wash causes the and
dust to rise along the center of the fuselage sides, not over the
cockpit area.

Pat

Pat Flannery wrote:



Vince wrote:
BlackBeard wrote:
On Jun 15, 11:47 am, Pat Flannery wrote:
Vince wrote:

they have noticed that
What they should have noticed is how that side-by-side rotor layout
causes sand and dust to rise around the fuselage during landing,
blinding the pilot.

This differs from any other rotary wing craft how?

very very high disk loading with yaw effects


6. HIGH DOWNWASH VELOCITY

Because of the high disk-loading of V-22, the downwash velocity is
about twice that of any conventional helicopter, and because of the
side-by-side placement of the prop-rotors there are two distinct
downwash wakes that are transverse to the flight direction. This has
several operational implications that bear on safety issues. The most
critical one, I believe, is the effects of downwash on landings at
night in a desert environment – a challenge in any helicopter, but
more difficult, and potentially dangerous, in the V-22.

http://www.g2mil.com/V-22safety.htm

In something like the Chinook, the twin rotor down wash causes the and
dust to rise along the center of the fuselage sides, not over the
cockpit area.

'Taint so, Pat - The CH-47, and pretty much all tandem-rotor helicopters
since the H-21, have overlapping rotors. Downwash over the center of the
fuselage is very high, due to the 2 sets of rotor wash adding to reach
other.
What you get with a 'Hook hovering over dust, sand, or water is an
incredible amount of crud blown around for quite some distance - there's a
good image here at:
http://www.rdecom.army.mil/rdemagazi...ASCARtech.html


--
Pete Stickney
Without data, all you have is an opinion