Got to the river around 6pm,
Nice 15-20 knots, rig sail, prepare brand new board for first use.
Hit water, Yeehar !!
Bear away, fin starts humming ?, I crank a big bear away, fin starts really humming.
Mmmm, I thought I spent a good hour fiddling with this fin!
Very hard to initiate a gybe, a few tail walks !!, Oh dear I hope this new board ain't a lemon.
Wind drops, session over.
Put board on ground, have beer.
Friend says, gee that's a big fin you've got for a board that size !
I look, I have put a 42cm fin on my 86 litre board .......
That would explain the whistling, and I still got a 29 knot maximum.
The board pointed upwind really well though.
Done anything dumber
had to drive back 10kms that day
It was probably partly my workmanship but I think the thing is way to stiff to allow correct positioning (on the curve) that fully protects the edge of the board. 
Maybe this would be the go. That remnant of the tape stuff comes off with a glue release agent used in household products.
