Buff crosswind crab taxi
I’m an old BUFF driver from the ‘70’s. In that time frame we were restricted to airfield with 300 ft. width runways. The crosswind crab system was never contemplated as an aid to turning sharp corners, or taxiway maneuvering, but permitted us to land in 45kt direct crosswinds. The crab setting is precomputed and applied when aligned for takeoff, and removed when slowed to taxi speed after rollout. I had a copilot apply the setting in the wrong direction once. He saw his error, and cranked it all the way the other way while we were rolling. A thrilling low speed rudder dance ensued, similar to the video.
On those if you've got it right then as you flare and push the drift off the aircraft yaws and the flightdeck returns to the centreline..I'm guessing for the Buff guys they flare and accept the offset remains on touchdown
Last edited by wiggy; 4th Sep 2023 at 07:19.
The following users liked this post:
Apologies if I'm teaching you to suck eggs but to some degree (SWIDT) it's much the same, at least until the actual de-crab, when flying anything long bodied on an approach with the drift on. You fly down the approach with the flightdeck tracking offset to the upwind side of the centreline.
On those if you've got it right then as you flare and push the drift off the aircraft yaws and the flightdeck returns to the centreline..I'm guessing for the Buff guys they flare and accept the offset remains on touchdown
On those if you've got it right then as you flare and push the drift off the aircraft yaws and the flightdeck returns to the centreline..I'm guessing for the Buff guys they flare and accept the offset remains on touchdown
As for rotation on a BUFF, the arm between CG and rear wheel set is very much larger than on a regularly geared airliner/military type, requiring a significant downforce from the tail. One more reason for the built-in angle of incidence on the wing as you would never be able to achieve the same rotation with this size tail as on a civil airliner.
The following 3 users liked this post by Vzlet:
Join Date: Apr 2008
Location: Crystal Lake, IL USA
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
BUFF takeoff and landing
With regard to takeoff and landing characteristics, because of the wing incidence angle, the airplane would try to fly off tail end first if you didn’t apply back pressure at VR.
As you approached the flare for landing, if you were trimmed for approach speed, you’d run out of up elevator authority trying to flare. Trimming in the flare is required to keep from hitting front trucks first. ‘Getting a nose gear’ results in a dramatic bounce. Trying to salvage it often produces a serious PIO. Go around definitely recommended.
I flew with a guy off C5 Galaxies. He said the early ones had a crabbing landing gear for cross winds, but after an event when one landed with the wrong way selected, the system was disabled, as the de-crab was no big issue.
I think the rearmost MLG leg is still able to castor.
Have a look at 1:18 in the video on this page https://www.gettyimages.nl/detail/vi...tage/816064990
It shows an Autoland sequence on a HS Trident, including the Rad Alt indicator shown above.
It shows an Autoland sequence on a HS Trident, including the Rad Alt indicator shown above.
Ecce Homo! Loquitur...
I believe the picture was posted in response to Stillton in #10 and in particular the use of the term “kick-off Drift”, rather than reference to the function of the instrument itself in the Trident blind landing system.
Terminology and the use of words changes over the years.
Terminology and the use of words changes over the years.
I believe the picture was posted in response to Stillton in #10 and in particular the use of the term “kick-off Drift”, rather than reference to the function of the instrument itself in the Trident blind landing system.
Terminology and the use of words changes over the years.
Terminology and the use of words changes over the years.
Avoid imitations
Join Date: Nov 2000
Location: Wandering the FIR and cyberspace often at highly unsociable times
Posts: 14,576
Received 431 Likes
on
227 Posts
Surely on a B-52 there is always a yank on the yoke….
The following users liked this post: