A question for technician people; if someone think this post is a
little Off Topic in Neil Pryde Forum, I ask him to help me to put this
question in the right place. Thank you in advance.
You know certainly question of One Foot Off measurement for calculating
Problem born when you consider a race or formula board with a diamond
stern (called Diamond Tail by AHD), or with characteristic triangular
drainages (used by Fanatic TT or F2 T-Rex); function of these different
devices is to avoid cavitation pheneomena due air suck by fin caused
when it is placed so near the stern as in such type boards.
Now, if you refer to following drawing:
I wonder if One Foot Off has to be measured from extreme stern (point
"a" in both cases), or from edge of fin base (point "b" in both cases).
This because I have a dubt on what to take in consideration:
a) if board surface capable to really generate hydodynamic support
(without appendages, or surface comprised by point "a" and "b" which
function is essentially to avoid fin cavitation);
b) all board parts (with appendages).
In above drawing, Case number 2 shows the extreme limit of this
question due irregular design of board stern and because surface
comprised by points "a" and "b" is really marginal in terms of lift;
but measure the One Foot Off from point "a" instead from point "b" is
NOT quite marginal because may generate measures of fin definitely
Someone has some idea or suggestion?