sorry about the caps lock. i did a google search for them and they have a web site but it was not real helpful. From what i understand there is a offroad setup and then these aircraft set ups and they have a vac advance so the airplanes don't run out of air and bog down. i was just wondering if anybody had ever heard of using the aircraft style ones cause the racing i would like to use them for you gain 5000 feet in elevation in twelve minutes so you worry about burning up on the bottom and losing alot of power on the top