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Category:Fiberglass - Classic Boat Library Nov 25, �� However, since we�re assuming, for sake of explanation, that the absolute amount, type, and arrangement of reinforcing is the same in both hulls, and that, therefore, the total load each hull respectively can carry at failure is the same, the thicker hull (the hand-laid hull A) will carry less load at failure per unit of cross-sectional myboat014 boatplans: PHIL FRIEDMAN. Sep 11, �� Boat Construction Comparison. What you need to know about how your boat is made. The risk of increased costs and lost time on the water associated with using plywood in a new fiberglass boat are far too high to buy one using them. In the hand-laid days, a good installation was like pinning the tail on the donkey. Builders were. May 31, �� Home Boat Design Forums > Construction > Boatbuilding > Fiberglass and Composite Boat Building > Infusion VS Hand laid Discussion in ' Fiberglass and Composite Boat Building ' started by Jeffrey, May 19,
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Which is poppycock.. Provided all other factors are held equal � namely, that resins with equivalent post-cure mechanical properties are used in both cases, and very similar types, quantities, and placement of reinforcing materials are employed � a hand-laid laminate will be very close in strength to that of its vacuum infused version.

Whoa, you say, how can that be? Why do so many builders extol the virtues of their vacuum infused laminates? That works well for homogeneous materials such as steel and aluminum.

But fiberglass laminate is a composite material made up of glass or other reinforcing fiber encased in a polymer resin matrix. So understanding the comparative strengths of various different laminates is a lot more complicated. Let me explain. The absolute tensile and bending strengths of an FRP Fiberglass Over Wood Boat Construction You laminate depends almost entirely on the strength, quantity, and type of the contained glass or other fibers and their orientation Marine Paint For Boats Fiberglass Unit in the cured final product.

So if two almost identical hulls are laid up, one call it Hull A using hand-lay techniques and the other call it Hull B using vacuum infusion procedures, with identical configurations of fiber reinforcing, hull A will end up with more resin in its cured laminate than hull B. Consequently, hull A will be not only a bit heavier, but somewhat thicker. But since A has more cross-sectional area because it is thicker than B, the two end up having the same strength when considered on an absolute basis.

So then, you ask, what is the big deal and why all the touting of vacuum infusion over hand lay-up? The big deal is that good infused laminates generally achieve the same strength at less weight than an equally good hand lay-up.

And in yachts, you One Off Fiberglass Boat Construction Name will remember, weight reduction almost always makes a difference to performance and range. The other plus on the infusion side of the ledger is that vacuum infused laminates commonly exhibit more uniformity and predictability than hand-laid laminates, in terms of their post-cured mechanical properties.

Show Ignored Content. Similar Threads. Infusion - vacuum membrane press vs. Replies: 6 Views: 2, Replies: 16 Views: 3, Replies: 21 Views: 8, Replies: 5 Views: Replies: 12 Views: Resin infusion: Questions on mold temperature maximum and curing temperature maximum ahender , Oct 14, , in forum: Fiberglass and Composite Boat Building. Replies: 8 Views: Replies: 4 Views: Chris Rogers Jun 11, Replies: 3 Views: A cleaner, faster infusion for building a fiberglass sailing dinghy ProBoat , Jan 22, , in forum: Fiberglass and Composite Boat Building.

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