A380 hard landing at Oshkosh - video

John Smith wrote:

Safety first, and in a crosswind situation, it's safest to "plant" the
plane. Even more so if you have a limited runway in front of you.

Those two super pilots who comment have seen an A380 for the first time,
yet they've become instant experts. Just cheap Airbus bashing.

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 ?

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

Crab angle depends on speed, not on size.

I have no idea what the approach speed was. But assuming reasonable
numbers, 10 degrees of crab yield a crosswind component of 20 to 25 knots.

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

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.

"a" wrote in message
...
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!

You would not be moving, you would have to increase airspeed, until you
reached the runway.

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