Big and clumsy.My first camera rocket was made from 4” tubing. At that time we didn’t have 3” tubing. If your camera didn’t fit into the 2.63” tubing, and no camera fit into the 2.63” tubing at that time, you had to use 4” tubing. The 4” tubing gives you plenty of room for everything but it is somewhat wasted space and requires larger motors to get altitude.