I recall reading a book about Santos Dumont, he described flying in a balloon in a storm and was surprised that there was no noticeable feeling that you were in the storm although the balloon was of course flying at the speed of the wind.

BlueRaven is correct, as usual. Only changes in wind speed (I.E. turbulence) can cause an airplane to yaw and roll in reality. A constant wind cannot, once you have left the ground and the wind has accelerated you to the velocity of the moving airmass (remember that velocity means the speed and direction of the wind). It doesn't matter what your aircraft's indicated airspeed is, or its direction; your aircraft can still be accelerating, as long as the wind is no longer accelerating the aircraft to the velocity of the wind, and the wind will not affect the aircraft in any way other than in its position (not attitude) relative to the ground. So again, a constant wind cannot roll or yaw an aircraft under any conditions except for the initial few seconds after the aircraft first leaves the ground.

See this post for a more detailed explanation. BlueRaven, I would appreciate it if you would review it for errors, as you are not only a real-world flight instructor but also one who knows his physics rather than only flying by the seat of his pants as many real pilots, and most sim pilots, do. http://riseofflight.com/Forum/viewtopic.php?p=183623#p183623

A constant wind

A constant wind must cause a constant accelerating force, it's the law, that's what 'wind' is- changes in pressure in the surrounding, supporting fluid which exert forces on objects which have aerofoils canted at the right angle

The balloon/object has inertia and tends to maintain the same airspeed after the last push, when in the next moment it receives another push from the constant force. Balance or imbalance between: the object's inertia keeping the object moving without any forces acting- and the slowing down due to friction (drag)

Only friction stops any balloon achieving Mach 2. Or thereabouts

Only in a vacuum would a crosswind have no effect on a supported object, that's why aerofoils. If you could support the object in a vacuum that is, but this is a thought experiment so that's not going to work

Ming

Huh? You can't have a crosswind in a vacuum, because a wind is defined as moving air. If there's air, it's not a vacuum. Unless you mean a column of air moving into a vacuum and colliding with and surrounding an object that was formerly suspended in the vacuum. In which case, that crosswind would have an effect on the object. It would accelerate it to the velocity of the air.

Y'all are absolutely correct in that a steady wind should have zero effect on a plane in flight, however ROF does appear to have a bug in the FM/aerodynamic modeling whereby the plane reacts to steady wind as if it were a gust. From what I gather, the devs are aware of the issue and it will be addressed at some point.

=MFC=Gunloon