My fins rightly felt nervous as I pulled out the hole saw yesterday and tore into one of my fins. The fin is a hybrid that i put together from my Waterway glide footpockets and a standard blade from a waterway model 1 (medium stiffness)
Strangely the holes had less impact than I thought they would. The blade stiffness did not seem to really change and the number of kicks per 25m went from 5 to 5.5(single kick and glide) The only noticable thing to me was a feeling of increased drag. Not sure why the holes appear in some production fins. I imagine it's to do with setting up a certain type of flow across the blade and have asked someone with a training in fluid mechanics to have a look at it.
....a very strange feeling indeed taking a hole saw to a monofin
