After my 5x Mosquito crashed in 2001, I decided to build a larger modular motor mount when I rebuilt it. The BT-80 tube had enough room for a BT-70 size motor mount. I got some BT-70 and couplers from Aerospace Specialty Products and built the mount pictured. The motor modules can accomodate 1, 2 or 3 18mm motors, 1 or 2 24 mm motors or 1 29mm motor. This gives me the versatility to fly the rocket on a huge array of BP and AP motors from A to G impulse.