yes they can be a little squirrly on the ground but nothing you cant get used to as for a cub you would do better to jump up to a 40 or 60 cub much better flyer and at that size you dont need to couple the rudder to ailrons ,and yes i do own and fly cubs a 40 size 60 with a 91 fs and a 1/4 scale with a twin 180 fs shoot i taught my kids to fly on a cub rather than a standard trainer