I suspect it was added so that the stern would not squat as much at higher speeds.
It's not just a matter of displacement vs. planning (the term 'semi-displacement'
is a figment of marketing imagination), it's also about how easily a hull is driven through the water.
A true displacement powerboat doesn't need much power to attain moderate speed. By way of example, my 36' Gulfstar trawler will do 8.2 knots. with only one of it's 80hp diesel engines, while dragging the other's 17"prop. A friends 34' Marine Trader (semi-displacement) won't come close to that with it's single 120hp diesel.
eric SV Meander
---In electricboats@yahoogroups.com, <mkriley48@...> wrote :
I have a lot of experience with semi displacement larger powerboats.
viewing the boat it seem that it is a true displacement hull with a aft projection stuck on the hull. if it can be removed you will have a true displacement hull. Try it like it is then if you see eddies and wave making at the stern at 4.5 knots remove it.
It was added after the hull was made because it would be impossible to mold it with the hull.
mike
viewing the boat it seem that it is a true displacement hull with a aft projection stuck on the hull. if it can be removed you will have a true displacement hull. Try it like it is then if you see eddies and wave making at the stern at 4.5 knots remove it.
It was added after the hull was made because it would be impossible to mold it with the hull.
mike
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