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The goal of fins on a rocket are to maintain stability, and a good fin design allows for this while maintaining a high apogee for the rocket. For Prometheus, we aimed for a stability between TBD1-TBD 2? for the booster and a stability of over 2 for the sustainer. Although we decided to make our fins trapezoidal early on, we used simulation software (Ras AeroRasAero) to determine the size and dimensions of this trapezoidal shape. Since changes to parts in other subteams meant a different weight, CP, and CG for our rocket, we needed to re-run simulations whenever a change was made in another subteam and change the size and dimensions of our fins such that stability requirements were still meant. For this reason, Prometheus' fins were one of the last parts to be manufactured. Lastly, we installed four holes at the bottom of the fins that allowed the fins to be screwed together with the fillets. Below is a picture of a fin.
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