NZFF

I have been adding various ai addons to Christchurch and the surounding areas, Operation Deep Freeze, Canterbury Aero Club, GA, etc, and one of the aircraft I added was the red default Piper Cub to reperesent this cub here. But because the cub has no parking breaks and it is a little windy at NZCH, it decided it had a mind of its own! Here's what I mean;















Is there any way I can restrain it?