Building a new sailboat

ok what i will do is scan the drawings i have of the layup and we will go from there.I apologize that i did not do this from the start.

 

No need to apologize

 

old keel pic

 

[/ATTACH] new keel pic...sister boat

 

Propeller Size

Propeller Calculation

Dear Sir
If you sent me the details of your boat I will calculate to find correct
size of propeller
www.cembercidenizcilik.com
oktay@cembercidenizcilik.com
Oktay Çemberci

 

Just came across this thread and hope it's not too late to add to it.

I'll suggest you get Dave Gerr's book "Elements of Boat Strength". It covers exactly how to calculate the structure for a hull in different materials including solid and cored fiberglass.

It's kind of a "cookbook" in that for a given boat it will give you one laminate schedule. For example, a hull has to be thick enough for both strength and stiffness. By making the panels between stringers and bulkheads smaller, you can be strong and stiff enough with a thinner hull. Gerr's calculations give you one set of spacing for stringers and bulkheads, and one hull thickness.

The result is somewhat conservative, so you can probably do better. American Bureau of Shipping has a manual called "Guide for Building and Classing Offshore Racing Yachts". (download at http://www.eagle.org/absdownloads/listdetails.cfm?id=112) It's much more technical, and gives you formulas to calculate everything, so if you want to try more bulkheads, you can calculate the new thickness.

The article in Professional Boatbuilder magazine is also very good. If you want to go to composite systems other than polyester/roving/mat, make sure to experiment with test panels to determine the properties of the materials and methods you have. If you go to epoxy resin, especially with cores, think about vacuum bagging to better consolidate everything.

http://www.rutuonline.com/ documents the backyard building of a 45' sailboat. Not the same as what you're doing, but probably has some construction information that can help.

Good luck,

Tim