Launch lug

Launch lugs are small cylinders attached to the sides of most model rockets, into which the launch rod is placed prior to a launch. They are generally made of either plastic or thin cardboard to minimize additional mass.

Use

The sole purpose of launch lugs is to provide stability for a model rocket prior to and during liftoff by forcing the rocket to remain parallel to the launch rod during the first seconds of flight, before significant velocities are reached and enough momentum is built up to maintain stability. At higher velocities, the fins act as the rockets primary stabilizing devices.

Position

In smaller rockets, one launch lug is generally considered enough, and is attached at the joint between one of the rocket's fins and the main rocket body. In larger, heavier model rockets, a second launch lug is generally added closer to the nose cone and lined up with the first, to provide additional support. The diameter of a launch lug generally closely matches that of the launch rod, although it is very slightly larger to minimize friction during the precarious first moments of flight. Length varies, ranging from less than a half-inch in smaller rockets to a few inches or longer in larger ones.