A380 hard landing at Oshkosh - video

Dave wrote:
They HAVE to be landed in a crab, or you drag that expensive #1 0r #4
engine on the rny!

Actually, they *can* decrab in the flare to some extent. Those huge
planes have sufficient inertia that they don't get instantly blown off
the runway even with the wings level. It's the pilot's choice whether he
wants to try a nice landing or just keep it simple and safe.

They are designed to handle the side stress....

Of course.

"John Smith" wrote in message
...
Dave wrote:
They HAVE to be landed in a crab, or you drag that expensive #1 0r #4
engine on the rny!

Actually, they *can* decrab in the flare to some extent. Those huge planes
have sufficient inertia that they don't get instantly blown off the runway
even with the wings level. It's the pilot's choice whether he wants to try
a nice landing or just keep it simple and safe.

They are designed to handle the side stress....

Of course.

Actually, this has been discussed previously of this formu with regard to
certain Airbus models. Apparently, some allow the rudder to be used
independently, under some configurations, and some others might not. That
serious of discussions were related to another video clip that was
referenced and circulated a year or so ago.

Personally, I have no idea; but I admit that I am curious.

If you happen to have access to the operating manuals for the A380, would
you please be so kind as to divulge the control rules for the rudder just
prior to touchdown in the landing configuration.

Peter

Peter Dohm wrote:

If you happen to have access to the operating manuals for the A380, would
you please be so kind as to divulge the control rules for the rudder just
prior to touchdown in the landing configuration.

I don't have access to operation manuals, but this clip of two test
landings at Keflavik (Iceland) with crosswinds between 40 and 50 knots
should answer the question: http://www.youtube.com/watch?v=i5pGlw4o3Ks

Gilbert Smith wrote:

On the crosswind, all aviation videos (other than those taken standing
on the centre line) appear to show massive drift angles.

What sort of crosswind would require 10 deg of crab on an a/c of this
size ?

Ahem...
for an aircraft of ANY size, a 10 degree crab is required by an 18 kt
crosswind, for every 100 kts of approach sppeed.

But approaching aircraft are photographed by telephoto lenses - which
greatly exaggerate visual crab angle.

Brian W

On Wed, 05 Aug 2009 21:06:40 -0500, brian whatcott
wrote:

Gilbert Smith wrote:

On the crosswind, all aviation videos (other than those taken standing
on the centre line) appear to show massive drift angles.

What sort of crosswind would require 10 deg of crab on an a/c of this
size ?

Ahem...
for an aircraft of ANY size, a 10 degree crab is required by an 18 kt
crosswind, for every 100 kts of approach sppeed.


This may be a little misleading. The crab angle decreases with
increasing TAS for a given crosswind strength. This may suggest that
the crab angle increases with increasing TAS.

As for the calculation of crab angle:

crab angle is the arcsin of (crosswind strength / true airspeed)


But approaching aircraft are photographed by telephoto lenses - which
greatly exaggerate visual crab angle.

Brian W

Yeah. That is why they designed the B-52 with a crosswind landing gear.
The main struts can be hydraulically turned up to 20° so that, while landing
in a crab the main gear is aligned with the runway. A wing low cross
controlled approach and landing is not feasible with an aircraft that
large... plus the outrigger landing gear.

Darrell R. Schmidt
B-58 Hustler Web Site
http://members.cox.net/dschmidt1/
USAF Pilot Class 55-I Web Site
http://pilotclass55india.org/

"Dave" wrote in message
...
Agreed!

They HAVE to be landed in a crab, or you drag that expensive #1 0r #4
engine on the rny!

They are designed to handle the side stress....

Tires (are still) cheaper than engines....

Dave




On Mon, 3 Aug 2009 09:16:27 -0700 (PDT), K M wrote:

On Aug 1, 10:39 am, "Darkwing" theducksmail"AT"yahoo.com wrote:

Yowser!

Bob is right about this one . Another thing about certification is
that a transport category plane is certified to touch down in a crab
right up to its cross wind limit . The idiot narrating this video
should try landing one of these in a cross wind without contacting
the ground with the engine nacelle . On the Boeing you only get a few
degrees before this becomes a factor . Gyder is an idiot .
FB

Jim wrote:
On Wed, 05 Aug 2009 21:06:40 -0500, brian whatcott
wrote:

Gilbert Smith wrote:

On the crosswind, all aviation videos (other than those taken standing
on the centre line) appear to show massive drift angles.

What sort of crosswind would require 10 deg of crab on an a/c of this
size ?
Ahem...
for an aircraft of ANY size, a 10 degree crab is required by an 18 kt
crosswind, for every 100 kts of approach sppeed.


This may be a little misleading. The crab angle decreases with
increasing TAS for a given crosswind strength. This may suggest that
the crab angle increases with increasing TAS.

Yes indeed. Thanks for pointing that out.

Brian W

"brian whatcott" wrote in message
...
Jim wrote:

Ahem...
for an aircraft of ANY size, a 10 degree crab is required by an 18 kt
crosswind, for every 100 kts of approach sppeed.


This may be a little misleading. The

-- crab angle decreases with increasing TAS for a given crosswind strength.

This may suggest that the

-- crab angle increases with increasing TAS.


Yes indeed. Thanks for pointing that out.


Unless I'm missing something, it sounds like he contradicted himself or left
something out.

Matt

Matt Barrow wrote:

Ahem...
for an aircraft of ANY size, a 10 degree crab is required by an 18 kt
crosswind, for every 100 kts of approach sppeed.

This may be a little misleading. The

-- crab angle decreases with increasing TAS for a given crosswind strength.

This may suggest that the

-- crab angle increases with increasing TAS.

Yes indeed. Thanks for pointing that out.

Unless I'm missing something, it sounds like he contradicted himself or left
something out.

You're missing that "this" refers to the post he's referring.

On Aug 5, 10:06*pm, brian whatcott wrote:
Gilbert Smith wrote:
On the crosswind, all aviation videos (other than those taken standing
on the centre line) appear to show massive drift angles.

What sort of crosswind would require 10 deg of crab on an a/c of this
size ?

Ahem...
for an aircraft of ANY size, a 10 degree crab is required by an 18 kt
crosswind, for every 100 kts of approach sppeed.

But approaching aircraft are photographed by telephoto lenses - which
greatly exaggerate visual crab angle.

Brian W

Brian, you're not quite right, it's more nearly an inverse
relationship between crab angle and airspeed, angle increasing as air
speed decreases for a given crosswind. Think of the crab angle if you
flew a 100 kt pproach into a 100 kt xwind. You'd fly at 90 degrees to
the runway and have the shortest landing roll you can possibly have
and still have a useful airplane afterwards!

Of course, getting to your tie down would be a problem.