Adding Weight while rebuilding Stringers

let me clarify- I would like to try to add this weight sub Deck.
If I could figure out some way to auto fill and drain a water source...
Dont want a boat full of fat sacs and no room...

+1 ^

TRBenj wrote: Vee hulls make lowsy surf boats in my experience.

phatsat67 wrote: +1 ^

Brett wrote: ??

Zach is agreeing with Tim

copy- that what I was thinking as well. just checking to see if anyone had tinkered in this area.

To answer the question, yes it is possible, has been discussed and shown on this site - a pretty high level example in the thread below.   

Underfloor ballast thread

Not all v hulls are the same of course, but a sw 18 is basically the BFN hull and the bfn hull doesnt surf very well with just ballast, it was a washy mess in my experience. It is quite possible a suck gate of some sort could help. The bottom angle at the chine would seem to be critical in my mind as to pulling a good clean pocket and it quite different on an old CC vhull than a "mod V" centurion.

Sounds like you may have the wrong hull to start with I’m no expert, I have often wondered if your on a tight budget and time scale and you need to pull with weight all the time, if it would be easy to just remove old floor and stringers leave the foam in if it has it, then cut old foam down in height a few inches at the front and taper down to the hull at the back, then shutter up area’s that need to be accessible and some big plastic pipes to lay in for exhaust, then order ready mix concrete with fiberglass mix and shoot it in , vibro poker would be good if you can get one, and may need to have sprinkler on the outside to keep the hull cool as it dries through the heat phase.
As it dries smooth for a polished floor, or tile after.
Depending on the thickness could lay in some S/S rebar in the main stringers hung on wire held by temp wood bars laid across the boat.   
Should have plenty of weight then to start with and great fixing for engine mounts.
Good luck with your build, thanks for posting something for my mine to play with as I work.     

TRBenj wrote: I don’t think 20deg is considered a deep vee.:: cc’s are closer to 24. But I will clarify: the vintage deep vee direct drive correct crafts that we have attempted to surf- from the Bfn to the 23’ Fish- have resulted in a lackluster wake that is extremely washy and therefore neither long nor steep. We have had much better results with smaller flat bottoms like 2001’s. A large v-drive moderate vee Centuroon would be a different animal than the Martinique in question. All of our trials are 10 years ago or so and predated the aid of the tabs and wake shapers that have evolved since that time so maybe something can be done... but my expectations would be set pretty low on turning one of these boats into a viable- let alone good- surf boat.

I think if you look at the picture below, print it out and check with a protractor or angle finder you'll come up with 20 degrees plus or minus a teeny tiny bit. More on the minus side.

Easy enough to draw a reference line between lifting strakes and measure the angle

Or measure yours in real life.

My 1980 BFN angle at the back reading 15/16 degrees @centerpoint and 20 degrees @ edge of keel... may be of some help.