One of my favorite exercises on a windy day is to take a plane like an Lt 40 up and try and hover and better yet try and get it to go backwards... Well it only looks like its going backwards.. really its only flying slower than the wind is going.. It is a lot of fun and you sure find out a lot about what your plane looks like just before it stalls...I have never tried to lift off with zero ground speed but there is no reason that the plane would not do it.. Basically its almost the same as when the wind picks it up and blows it over .I would be a little scared to try and take off with zero ground speed because if it went wrong chances are the plane will receive some damage ..I do enough without asking for it..It might be kind of fun it tie one to a cord sort of like a glider and see if you could fly that way So taking off with zero ground speed is possible but ill advised in my opinion...