fin selection - 146L board, 6.2 sail

That is based on fin size for planing

What level are you at? Planing fast with outboard straps will be very different to using the setup you have as a beginner. An expert would not use smaller than about 7.5 on that board, most like 8-9m

30 - 35cm
Dont over complicate it.
Fin = (5 x sail m2) +\- 2cm
+ if you're a heavy sailor
- if you're lighter

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BSN101 said..
How wide is the board?

76cm

I have the same board and have gone through the progressions you describe. I have used sail sizes from 5.7 to 7.2 m with different fin setups. Initially I was very inexperienced and just used the 48 cm fin, both in sub planing and overpowered situations. The big fin was good for light wind days but it caused a lot of tail dancing when the wind got up a bit. I thought this was normal! Eventually I found out that a smaller fin should be used for the sails I use, so I dropped down to a 38cm fin. This was much safer and still got the desired result in wind conditions between15-20knts. If it is windier than this then you will probably be thinking of using a smaller board. I jumped down from 146 to 107 but would recommend a 120 if you want a more gentle learning curve. Occasionally I still use the 146 when the winds are really light and I am using a smaller sail. On those days the fin gives more lift to get on the plane and the smaller sail ensures that you are not too overpowered.

+1 for 38cm fin with the 6m sail on that board.

Thanks everyone for the advice