Cone shape experiment (9): making rocket fins

Having a total of 6 rockets, a total of 18 fins were needed since each rocket would have 3 fins. The dimensions for each fin were as follows:

Having two types of cardboard (one thick and one thin), I concluded that the thick cardboard was fine to be used by itself and the thin cardboard should be used in pairs.

A total of 18 fins were made.

The fins were attached to the rocket body