You can't use a number if you aren't that boat.

It's not fair to the system nor to the other sailors. Just because you 'think' you ought to have a number doesn't make it correct use of the system.

Boats' base number are figured according to how they are configured as described, eg STOCK. Modifications are MODIFICATIONS, regardless of how they were achieved, and should be calculated as such. You aren't racing an SX, you're racing a modified TheMightyHobie18 Magnum.


You have to work with what your boat was TO BEGIN WITH, and you say it was an 80's model TheMightyHobie18.

What you have, and how I would figure you:

You started with an 18 magnum, so you start with that number:
Hobie 18 & 18 Magnum TheMightyHobie18 71.4 76.8 73.5 69.5 66.8


You have a larger than stock jib, so you get hit for that:
JU For larger than standard jib 0.995 0.984 0.990 0.995 1.000


You added an oversize main, so you get hit for that:
ML For non-class legal mainsail, of greater sail area* than standard main 0.980 0.969 0.975 0.980 0.985


You added a chute, so you get hit for that:
SP Class normally without spinnaker, genoa, reacher, hooter or wire/rope luff headsail attached to a pole, carrying one or more 0.960 0.953 0.958 0.960 0.960


So, let's figure your base number:
71.4 * 0.995 * 0.980 * 0.960 = 66.8

That is what your base number should be, 66.8... NOT 71.3... sorry if you don't like it but it would be more fair, and is how the system is meant to work.

If you are modifying to conform to the Formula class, and you measure as such, you might could take the F18 number, but that is only given that you fit under the Formula rules. Anything else is truly not fair.

Certainly, the authority to answer this question is the Portsmouth maven, Darline Hobock. She can be reached at dhobock @ aol.com

(but I bet she agrees with me...)

sea ya
tami