I'm trying to determine how launching in the direction of the wind might affect apogee. In RasAeroII, you can input a launch angle (only positive) and a wind speed (positive or negative). From what I've determined, inputting a positive windspeed works basically as expected, with the rail starting pointing into the wind and the rocket turning more into the wind. It should be optimal to launch with the wind, such that as the rocket turns into the wind, it actually becomes more vertical with respect to the ground. I suspected that this was the purpose of a negative wind speed for the RasAero launch conditions. However, when I give a negative wind speed (for any rocket -- pick a random example one that comes with the program and try it) -- the rocket becomes unstable almost immediately upon leaving the rail. Could someone tell me either how I'm misusing this feature/what it is meant for, or how I might successfully model this?