I'm not sure if FSX properly simulates this, but in extreme xwind situations you can use aileron deflection into the wind to assist in ground tracking during rollout.

I'd also work on your technique.  You need to drop those wings into the wind to correct for drift across the threshold if you're going to kick it straight before touchdown.  Get on the spoilers immediately as they'll unload the wings and put all the weight on the landing gear.  That'll help your control of the aircraft.  Get on reverse sooner too.  The faster you slow everything down, the easier your life is gonna be.

 

 

If you watch your rudder on your landing your plane is doing exactly what you are telling it to do by your rudder inputs ,Lower your L wing into the wind & just enough rudder to keep fuselage straight down RW & like others pointed out do every thing to slow & get weight on landing gear

 

 

It appears to me that the plane is turning properly while still in the air.   At touchdown it is still a little misaligned.  After landing, you don't apply much rudder right away.  A second or so later you apply sharp rudder which appears to be causing the plane to skid on its main gear.  I think it is turning but the main gear is still skidding.  It's hard to tell how much it is actually turning (yawing).   It seems to me the plane wasn't very badly misaligned with the runway at touchdown -- the left main gear is near the runway center line and doesn't start moving fairly quickly to the left until you apply a lot of right rudder, which it looks like is causing the skid. So I am guessing sharp right rudder may be breaking the main gear loose.  You say that max rudder wasn't enough, but maybe it was too much.  When the nose wheel comes down it appears to act as a pivot point around which the main gear are still sliding.  Maybe try it again with less application of right rudder -- more gradual so the plane doesn't skid on its main gear. 

 

I will try this myself when I get a chance.

 

Thank you for posting this video.  It is very instructive for me regarding my own cross-wind technique!

 

Mike

 

 

thank you all for your advices, ive learned a new skill from you

here is the results;

(conditions; wind 287/48-runway course 343- aicraft fully loaded)

Hi, Erek,

 

Looks like a much better landing!  A good cross-wind landing with 48 knots at a 56 degree wind angle is very difficult.  

 

I believe the theory is that you should complete the decrabbing turn just before touchdown -- I'm not sure what the effects on the main gear would be of twisting and sliding on the ground, but in fact I've seen many pictures of heavy jets landing at Kai Tak and skidding all over the place.  Somewhere I read that it's acceptable for a 747 to land at quite a crab angle, and this is likely true for the T7 as well.

 

Also, again in theory, given the strong cross-wind, your cockpit should be hanging over the upwind side of the runway rather than right over the runway center line, as this will place the center of rotation (about where the wings and main gear are located) right over the center line, until you decrab.  I believe I read this on PPrune.org.
In other words your cockpit view should not be looking straight down the center line, but, in your case, to the left.  When you decrab, the nose will then swing right over the center line. But I find this hard to estimate in practice, especially given that FS doesn't really give a 3D view of the runway, and the amount of hanging to the side of the runway depends on effective cross wind and the aircraft approach speed. 

 

Mike

thank you all for your advices, ive learned a new skill from you

here is the results;

 

You started to kick off the drift, but not nearly aggressively enough. More right rudder, and a touch of left roll. She should be near enough pointing straight down the runway at touchdown. If you flare at 30 ft, kick off the drift at 50 ft.

 

I posted it the other day, but it got ignored. Here is how to correctly land in a crosswind:

 

http://tinyurl.com/of866ch

 

To add some more detail to the other question: the "hard limit" mentioned above is actually the maximum demonstrated crosswind limit. It is the maximum limit the aircraft is certified to handle, and is determined by flight testing alone. They take the aircraft to some of the windiest locations on earth for this purpose.

 

Best regards,

Robin.

Hi, Erek,

 

Looks like a much better landing!  A good cross-wind landing with 48 knots at a 56 degree wind angle is very difficult.  

 

I believe the theory is that you should complete the decrabbing turn just before touchdown -- I'm not sure what the effects on the main gear would be of twisting and sliding on the ground, but in fact I've seen many pictures of heavy jets landing at Kai Tak and skidding all over the place.  Somewhere I read that it's acceptable for a 747 to land at quite a crab angle, and this is likely true for the T7 as well.

 

Also, again in theory, given the strong cross-wind, your cockpit should be hanging over the upwind side of the runway rather than right over the runway center line, as this will place the center of rotation (about where the wings and main gear are located) right over the center line, until you decrab.  I believe I read this on PPrune.org.

In other words your cockpit view should not be looking straight down the center line, but, in your case, to the left.  When you decrab, the nose will then swing right over the center line. But I find this hard to estimate in practice, especially given that FS doesn't really give a 3D view of the runway, and the amount of hanging to the side of the runway depends on effective cross wind and the aircraft approach speed. 

 

Mike

 

hi Mike

 

i understand but i think that would be valid for lighter crosswinds like 35knts or so where you dont need to roll to the wind and in the case above, if i keep the nose gear on the side of the crosswind  of the centerline and give it a light roll on the same side, the plane would be too much left on the runway at touch down and i think it is better to only roll it to the wind then kick rudder to the opposide side while you are approaching from the opposide side to the centerline.

 

For the main gears, they are capable of stearing some little dgrees, only the last two ones for the sharp turns on the ground and touch downs with high angles.

check this out.

quoted from wikipedia ''When a front gear steered over 10 degree, main gear's rear 2 wheels will start those steering for minimizing turnning stress.''

 

You started to kick off the drift, but not nearly aggressively enough. More right rudder, and a touch of left roll. She should be near enough pointing straight down the runway at touchdown. If you flare at 30 ft, kick off the drift at 50 ft.

 

 

Thats what i actually did, but if i ve had put more rudder right before touch down, the wind would push me away from centerline as i ve leveled the wings for touch down  so no more roll and full rudder = aicraft slides away from the centerline.

 

but i agree if i would continued my roll till touch down that would give the same thing in the klm case you posted.

 

thanks for the informations tought

I land crabbed in the 777 on FSX. Simply because I use a joystick with a twisting action for the rudder - attempting a slip doesn't work well with my set up. As Rob says too - rudder is modeled awfully in FSX in my opinion. 

 

Land crabbed and kick her centre before the nose gear touches down! Works like a charm for me. Interested to try a slip when I do eventually get some pedals though.

Thats what i actually did, but if i ve had put more rudder right before touch down, the wind would push me away from centerline as i ve leveled the wings for touch down  so no more roll and full rudder = aicraft slides away from the centerline.

 

You touchdown with roll into the wind. I think you're good up to 10 degrees, so you won't drag the upwind engine pod down the runway on touchdown.

 

but i agree if i would continued my roll till touch down that would give the same thing in the klm case you posted.

 

I tried it here with 36 kts straight across, and IMHO the sim only just has enough rudder authority starting the maneuver from 50ft. I'm unable to completely straighten the aircraft (I still have 5 degrees to go to match runway heading).

 

This screen shot looks odd, but the left main is fully down whilst the right is still in the air. I was a little slow with the counter-roll, which is why I'm slightly off-center (downwind side).

 

Best regards,

Robin.

I remember reading in the FCTM that crosswind landings with zero slip i.e. not using the rudder to keep the fuselage straight with the runway should be avoided in crosswinds in excess of 30 something knots, something about having adequate engine/ground clearance, and you can land crabbed up to around 45 knots.

That makes no sense... it's OK to slip in wind conditions greater than 30 knots, yet they are worried about ground clearance in lighter wind conditions? :blink:

 

It's bad pilotage if you fail to kick off the drift before touchdown.

 

Best regards,

Robin.

For the main gears, they are capable of stearing some little dgrees, only the last two ones for the sharp turns on the ground and touch downs with high angles.

check this out.

No. The steerable main gear only activates with the noise gear turned greater than 13 degrees with the tiller; i.e. taxiing only.

That makes no sense... it's OK to slip in wind conditions greater than 30 knots, yet they are worried about ground clearance in lighter wind conditions? :blink:

 

It's bad pilotage if you fail to kick off the drift before touchdown.

 

Best regards,

Robin.

Nope, not bad pilotage. Bryan is correct! If you try a side slip only landing (zero crab) with more than 30kt Xwind, you are going to need so much wing low on the upwind side that you run the rist of hitting the Rwy with the wingtip (exspecially in gusty conditions).

You are supposed to land (touch down) with at least a partial crab.

In real life that is!

But like I said before, it is all modeled so badly in FSX that you cant even try it.

Last time i tried was with the NGX and I needed almost no bank (wing low) for my sideslip attempt with 25kt Xwind. Totally unrealistic I tell you.

 

I think the OPs second video is as good as you can do it in FSX!

So applaus :-)

I posted it the other day, but it got ignored. Here is how to correctly land in a crosswind:

 

http://tinyurl.com/of866ch

 

Best regards,

Robin.

Good example.

See how much wing down/bank that KLM has?!

(I am assuming this is a proper crosswind landing here, not a no wind screwed up landing)

Try that with FSX!

 

You will not have enough opposite rudder to prevent the aircraft from turning.

I have tried it.

I Started the maneuver in about 400ft.

Strong Xwind from the right, then take out the crab with left rudder (till the nose is alligned with the runway centerline) and put the right wing down with aileron.

In the real world you will find a balance where you have enough wing down to keep you from drifting to the left while still having the nose alligned with the centerline with left rudder.

Initially the aircraft seems to want to do what you want but then in FSX you run out of rudder and you are going to have to get back in your crab :-(

 

Someone else I discussed this with mentioned that FSX is coded incorrectly in that FSX rudder is finite. So after you reach the stop (max rudder deflection) FSX assumes NO rudder imput where the real aircraft with the rudder deflected would keep turning in the direction you are holding the rudder.

 

I dont know, all I know is I cant get a realistic side slip out of any FSX aircraft :-(

 

Which is why I say just land crabbed or take the crab out just before touchdown as in the OPs 2nd video.

 

This works because FSX seems to do the right things INITIALLY, but then if you were to hold this rudder and aileron for a longer period (as is required for a sideslip from 400ft) then the aircraft will just start a turn cause it runs out of rudder (which it should not).