As the manual tells you: it is the gear switch on the top left corner of the DX6I. In sport mode the RX dramtically reduces the elevator throw and offers only a small amount of 3X correction. I'm not real sure that this mode is very helpful. ( 'Course I'm a 3D guy and can't stand not seeing at least 60 degrees throw in preflight.) This plane is very responsive on all control surfaces and a blast to fly. Although it feels light to pick up and hold, it feels heavy in the air and IMHO isn't a very good 3D plane. The AS3X system works amazingly well, on my first landing (in a 15 knot cross wind) I swear it crabbed into the wind on it's own. I think my PA AddictionX has spoiled me as far as 3D planes go, but I'm keeping my Visionaire because it is so much fun to fly!