Call In the Naval architect

We spoke to Bill Schumacher, naval architect at Bradford Marine (www.bradford-marine.com), who worked in Broward Marine’s design office in the 1980s and ’90s, and asked him about hull stretching and other modifications on the Broward 100. Here’s what he had to say:

“You don’t want things to get too long in terms of your addition because you’re adding flotation back aft. You don’t want to raise the stern and push the bow down. Related to that is to make note of the total weight being added versus the added flotation. In most cases you want them to equalize.”

“The other item concerning hull-extension projects is the running gear typically remains in place. This is done because of cost and time reasons. So besides the flotation issue, extending the boat too far may create unintended handling problems.”

“Besides contracted new builds, Broward built on spec. If we didn’t have a customer, we’d build boats anyway, because we knew a customer would show up one day. So we would build a spec boat, and maybe it didn’t have a cockpit. And a person would come along and say, yeah I like that boat, can you put a cockpit on it? So we’d add a cockpit and basically it would be part of the new construction project. It’s easy to do this with metal boats.”

“Some of the older boats from the ’80s had a forward engine room. Later boats had a midship engine room. And maybe their engine rooms were small. So having that new cockpit or lazarette addition now gives the boat owner the opportunity to move generators or other machinery aft so you had two machinery spaces. You freed up space and weight up forward in the main engine room and the result is a better performing boat.”

“Bottom line is most boat owners forget about Archimedes. Each boat is different, so before engaging in a hull extension, consult with a naval architect…or maybe buy a larger boat.”

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