No wind side slip when airborne

[Nedum]

Hello!

 

After several try’s to take off the M2000C in DCS2.0 Nevada, I think I must question how realistic this ground wind effect is as long as wires of the plane are touching the ground.

First off I was sitting in a 40 tons truck whilst a storm was outside. We were driving with 90 kph and this truck as high as a small house never drifts away. This truck is 10 times more affect by side winds as any fighter Jet. Ok he has more wheels but even with my motorbike I never was blown away like in this game at high speed.

Now in a M2000C or a Su27 or any other "bigger" plane as soon as some winds goes the planes become extreme drifty.

Now the magic part!

As soon as all wheels are not touching the ground anymore the slip is completely gone!

The question is; why?

There is no drift/slip anymore as soon as the plane is airborne.

At ground with all wheels touching the runway the planes slip/drift like hell but with no ground contact they are flying straight ahead. No slip, nothing! As if there is no side wind anymore!

I know this exact the other way around! As soon as the wheels have left the ground I have to do much more work to counter the side wind slip.

The feeling of the ground movement overall seems for me "wrong" (like ice skating) in DCS.

As long as wheels touching the ground there should be much less drift as in the air and not more.

I think this ground side wind for planes with all wheels on the ground is wrong or a way overdone!

And that could be the reason for all this problems for the starts and landings of our prop planes also!

[fitness88]

I hear you. Flying version 1.5 I too have noticed at various altitudes I no longer have to make corrections for cross wind. I have noticed on occasion a slight need to crab when landing but I'll double check that. I'll also test this out with some exaggerated cross winds built into a test mission.

Version 1.2 had very real wind affects.

[bkthunder]

Sorry If I'm not understanding correct, but the only moment when you have to correct for wind with the rudder, is when your wheels are on the ground. As soon as you have no contact with the ground, you're simply moving in the mass of air, and there is absolutely no sideslip.

[fitness88]

Sorry If I'm not understanding correct, but the only moment when you have to correct for wind with the rudder, is when your wheels are on the ground. As soon as you have no contact with the ground, you're simply moving in the mass of air, and there is absolutely no sideslip.

 

Actually in the Mig-29s pilots are always correcting for sideslip due to winds at different altitudes. This is easily visible on your heading compass as you will see the compass tape slowly moving without input from you.

However this is not happening in version 1.5.

Edited December 26, 2015 by fitness88

[fitness88]

I tested in v.1.5 with a 30 m/s crosswind, the plane was definitely drifting sideways while still keeping the same compass heading [which is correct modeling].

In version 1.2 the same scenario would have resulted in a change of compass heading as well [which is incorrect modeling].

Edited December 27, 2015 by fitness88

[fitness88]

When the wheels are touching the ground a cross wind will cause the plane to weather vane into the wind.

Once the plane lifts off the ground there are no more ground forces as a result the same cross wind will now push the plane sideways with the plane keeping the same heading and no weather vaning.

Edited December 27, 2015 by fitness88

[mytai01]

When the aircraft is on the ground in high wind it wants to weathervain into the wind and pivots on it's main landing gear. All weathervains require a pivot point. In the case of aircraft, that point is the mainlanding gear. As soon as the mains are off the ground there is no pivot point. The whole aircraft should be pushed with the wind but there will be no pivot point to force the nose to point in another direction.

[fitness88]

When the aircraft is on the ground in high wind it wants to weathervain into the wind and pivots on it's main landing gear. All weathervains require a pivot point. In the case of aircraft, that point is the mainlanding gear. As soon as the mains are off the ground there is no pivot point. The whole aircraft should be pushed with the wind but there will be no pivot point to force the nose to point in another direction.

 

Quite right!