Originally Posted by George Steele
Does anyone have a good estimate as to the percent of displacement provided by the lead bulbs? (Of course some actual weights would be better.)
The simple answer is the maximum.
By using lightweight materials for the boat, you minimise the weight up top, and you can maximise the weight down below.
Getting the weight low down will aid stability.
So weight of bulb =
(displament equivalent weight) - (weight of hull+rigging+radiotray+fin)