Hi Guys almost done waiting on another pipe the 1080 tune pipe is a little long for this plane so I have a KS 89 coming I had to mount the rudder servo right behind the wing tube and mount the batteries on the motor box to get it to balance. I have never run in to any interference problem with this type of set up. Won't know for sure until I get my pipe mounted but so far it should come out right at 23lbs. Mark,