"Evan Gatehouse" wrote

I think it would be a very hard to make a better keel with add on bulbs
and
*improve* performance.

Like any other mod to anything, that depends on what 'performance' you want
to improve. Shortening a deep fin keel, for example, then adding a 'torpedo'
at the bottom will decrease draft and may make the boat more stable - at the
expense of more water resistance and slower turns. So a brown water cruiser
would say the boat's performance was improved whilst a racer would say it
was ruined.