Impact testing of fins

Impact testing of a fin in a (broken) surfboard.

What is the effect of a sudden impact on fins in surfboards?

This test is designed to analyse the effect that a sudden application of force has on the integrity of the fin, but also the fin box.

The picture collage above shows a snapshot of a 3 kg weight travelling at 11 km/h impacting a Futures AM1 fin in Futures fin box.

At the point of impact the fin deflect by about 20 degree angle!

The fin is not damaged, but the fin box shows some minor cracking.