Paladin145

Thank you! That makes perfect sense.
I was thinking the wing would raise due to the yaw at last seccond, but the aerodynamics of a landing a swept wing jet were never explained in our training. You would think it would be worth 30 minutes, or so

Paladin145

Nice landing, in my rookie opinion.
What I noticed:

- removed crab as low as possible ; about 5 feet it seemed ?
- still had some crab into wind.
- appeared to touchdown in slight crab, with slight side load.
- straightened nose after touch down.
- kept wings level. ( no chance of wing strike.)

Any thoughts on this one ?


https://www.youtube.com/watch?v=wol0Lh10gOs

WesternSkies

technique is technique but I don’t know anyone who lands in the crab except by accident.
This guys downwind wing definitely dips for lack of ailerons control.
There is plenty of aileron control and no need to side load these airplanes in normal ops.

What isn’t technique is momentum.

Adlerdriver

FYI, 777F cross-wind limits are 38 knots. With a x-wind component in excess of 28 knots, it's not possible to get to zero crab and the aircraft must be landed while crabbed.

Also, the aircraft is actually certified to land up to the maximum crosswind limits in a full crab (not my first choice of technique, personally). While not recommended on a dry runway in very strong x-winds, this is actually may be desirable with a slippery runway.

galaxy flyer

Pilot didn’t fully decrab; the right (downwind) wing dropped as the gear “took out the crab” the hard way. The rotation on the pivot point caused the wing to drop. It’s hard for a pilot to input aileron to stop the wingtip drop caused this way, as the rotation about the downwind gear is sudden and concurrent with touchdown. You are being, to some degree, being “tossed” in your seat at the same time as the wingtip moves. This is how downwind tips get stuck.

Better to land with some crab on than overdo the decrab input and land in a drift with the nose pointed a bit downwind.

WesternSkies

Interesting. Makes me think of that Boeing x-wind cert video.
For clarity in my previous post I was speaking of the CRJ series specifically, I hope I wouldn’t be such a jack wagon to speak in as general terms as it looked.

Paladin145

I was focused on the upwing wing, and crab angle.

galaxy flyer

I’ve done investigations on strikes.

GF

TheFly

CRJ. Crab until just below 10’ RA, then kick the rudder over. The more rudder input you apply, the faster the advancing wing will produce lift. If you don’t use aileron correction, a wing strike could occur.

galaxy flyer

Quick story on why “kick” is a bad word I don’t use.

Windy day going into Yakima in an empty C-5 which is a kite. 40* crosswind nearing the limits for conditions, IIRC about 28 knots of left crosswind component, 32.5* was the charted limit. Newish pilot flying, we had a discussion on crosswind techniques. He was ready and geared up. Nicely flown approach off the VOR, good weather except for winds. I’m in the right seat, watching, hands off the controls, feet resting on the pedals. He’s nicely stable and good air speed control going thru 50’, I call “20”, and my right pedal disappears under my foot. Oh boy! Nose swings thru the centerline, I grab my set of throttles and, say, “MY AIRPLANE”. As the thrust kicked in we were at the right hand edge of the runway and I remembering wondering if we’d touch. Off we went, thanks to GE and a light airplane.

Point being, just squeeze enough rudder to align the fuselage with the runway, think upwind aileron to hold the wings level, which will probably have set 2*-3* of bank into the wind. It’s poetry, not prose.

GF