AUS 2459 said..
Just wondering which type of Finn would be quicker for speed on a 110L board for speed because I see a lot of guys using weed fins and getting 40 plus knots and same with the normal Finns so I was just wondering if there was a clear option for Which is better

thanks Aiden

Pointers but a lot of the speed locations are shallow and weedy . This gives the flatter water and weedfins are required.

As others have said, more upright speed fins are ultimately usually faster in water without weed, but most of the best non weed speed fins have some rake nowadays anyhow. For speed boards (under 50cm wide), I have found a bit of rake (20-30 degrees) makes control easier on the limit which ultimately allows faster speeds..

For Slalom boards in no-weed conditions, Upright or 'Pointer' fins are more efficient, but make sure you have the right size for the combination and conditions you are sailing in. The right size is not any easy thing to predict as there are so many variables. Your board shape, (tail width, for strap setup and rocker etc.) your height and weight. The constitutions (gusty or steady - flatish, rolling swell or choppy) The angle you can sail at. The type of sail and size etc, etc.

You won't see many, other than the larger expert guys, getting 40 on 110L slalom boards.

It's extremely rare to get perfectly flat water in the winds required to hit 40 Knots on a windsurfer. In most venues you will have at least 'chatter chop' or rattle chop, even in the Luderitz Canal

Lake George, Budgiewoi and a couple of weedy lakes around Mandurah are the notable exceptions. At these flat locations, 40's can sometimes be had in high 20's winds, but most of us really need a pretty solid 30 to get it consistently.

Contrary to popular belief, Sandy Point in it's heyday, was anything but perfectly flat when you got off the wind enough to crack 40. And when it was blowing 35-40+ knots and speeds got into the mid to high 40's, the 'rattle chop' could be pretty daunting.

I have no idea what is required to do 40+ knots on open ocean. Maybe ask Chris Lockwood?