I attended the 1967 nats as a kid. One of the demonstrations was a large u-control model with 13 Cox Babe Bee engines mounted on the wings leading edge! The crew would call for volenteers, small kids of course and give them an engine to start. When enough engines were running they would wave the kids away and fly the monster! The sound of 10 to 13 Cox engines, running at the same time, and not in sync, is something you never forget! Good luck with your project!