Hi Nev,

With many boards coming with 5-4-3- fin options I've often thought about empty fin plugs / boxes and how they might disturb the flow of water across the most important part of the board, the tail.
(particularly the Future fin boxes. I surf my Dominator as a thruster most of the time so i have two vacant fin slots.)

I've used a hose to create a fast flow of water across the bottom of my board and have seen the disturbance to this flow when the water enters and exits the empty fin slots at speed.
The water will enter and exit at 90 degrees to the bottom of the board at certain flow speeds.
I am guessing that this disturbed water flow would be increased by a board traveling at speed across a wave face.
And that it could react in different ways at different speeds as the board manouvers thus creating random drag, and lift.

I'm thinking of cutting down an old set of fins to create an insert for the box that will finish flush with the bottom of the board.

Should i stop loosing sleep over this???
To be honest, with my standard of surfing and my age (60) this will never be a real problem for me.

I'd be interested in your thoughts

Regards

Paul