one when dealing with formulas you don't understand try some numbers and see what makes sense. Based on that, both of the formulas you quote are very wrong. My 40 foot ketch
has an "I" of 49 feet. So....
(49^2)*0.5 = 1200
(49*0.5)^2 = 600
Both of these numbers are way too big for a rational storm jib
. My 100% jib
is less than 300 sq feet!
The correct answer does not invovle the factor of 0.5 rather it is 5% of I^2. So for my boat it would be (49^2)*(5/100), or about 120 sq feet, something a lot more rational. Although if I was buying
a new storm jib
, I'd likely be looking for something a bit smaller than that.
Remember, this is a racing rule
. If you are not racing
the best size for your boat might not be (and is likely not to be) this size!