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Old 16th March 2012, 10:53 AM   #15
Jean-Marc
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Join Date: Aug 2006
Posts: 1,338
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Joe,

I just discover that table made by pfaffi:

http://www.pfaffi.at/pfaffi_fins/F1_...ition=download

2 points are very interesting to note in order to be able to start and sustain the planing as of 7 knots:

1) for a light weight rider of 65 kg, a fin lenght of 53 cm should suffice according to his theory. That is a correct estimation because what I've found to be a good fin lenght by trial and error is that I have used in the past a 54 cm fin with a 10.6 m2 sail (a 48 cm fin was too small for low wind range).

2) Pfaffi used a Formula HWR board, a 70 cm fin and a Severne Reflex 12 m2 sail to be able to start and sustain the planing as of 7 knots. He weights 92 kg.
If his theory holds true and according to his table, you should be able to do the same with a 75 cm fin for your 100 kg body weight.

However, the important point is that your Fanatic mega cat cannot hold a 75 cm fin. I'm sure that the new Formula 167 Wide can hold a 75 cm fin.

Cheers !

JM
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