As I said I got to talk to him about it. Now this was along time ago and I dont know the two people who were flying on that day, but I do know this. Two people were flying RC Pattern and they set the pipe up on their ship way to long and when they were flying their RC Pattern ship they noticed something strange, when they pointed the nose up the engine picked up and when they pointed the nose down the engine came back to it's origanal RPM, They did this again and again and got the same results..So one of them went over to Bob Hunt and said Watch this and sure enough point the plane up and the engine picks up, point it down and the engine comes back. So these two gents say to Bob, Where would you like this to happen!! It was then that Bob Hunts reteirment from controline was over, He went to a feild and hooked a pipe up to an old ship and it performed the same way!! He then went to the only guy he knew who could work this new technology out and that would be Mr. Bill Werwege(sp) No one can burn fuel like Bill , he burned fuel and burned fuel and said something to the effect that the tuned pipe setup is going to set the stunt world on it's ear!