Although the labor in vacuum infusion might be less, the materials and consumable items associated with the process are relatively quite expensive.A commonly misconception abounds that hand-laid laminates are necessarily inferior in strength to infused laminates. In Whalers case the foam core is the strength and shape of the hull, and the glass is just a skin to provide a moisture barrier and a nice finish look. Mat is simply a random orientation - the same thing as a chopper gun is providing albeit with a bit shorter stands.A lot of discussion has been expended toward the foam core. It was fast. If You Could Choose between Two simalar boats and one was Hand Laid and One was chopper gun and the price was the same which way would You Go ? Mat would be smooth and chopper gun course or rough. Because greater weight generally requires increased motive power, one of the goals in FRP laminates is to optimize strength-to-weight ratio. A Whaler does have stringers of sorts (the foam), but there are continuous and everywhere providing far more support that conventional stringers.Yes, Whaler has always used a chopper gun lay-up.

If the outer skins of the hull were penetrated by an accident(inferred through the term Your mention of sponges is a great example of an open cell foam; it would not however, create any positive displacement (unsinkability) in this case if the hull were penetrated and swamped. Let me explain.The absolute tensile and bending strengths of an FRP laminate depends almost entirely on the strength, quantity, and type of the contained glass or other fibers and their orientation in the cured final product.

ALL Boston Whalers have some hand laid mat and roving. But, the foam is providing two very important functions - one, to provide the floatation and two, to provide the separation of the two fiberglass 'shells'. consists of a alternating blend of mat fiber, cloth fiber, woven glass roving, and chopped fiber, some of this handlaid, some, nowdays, computer/machine applied, and some chopper-gunned. Excess resin results in extra weight, which does not equate to extra strength. Realize that the foam core is NOT the strength of the hull as has been stated. And be assured, those Whaler chopper gun operators know what they are doing - they are good. It truly was eye-balling it up design and very heavy.In the 80's, I remember that Ocean Yachts were selling based upon "30 knots to the fishing grounds and back" to help win tournaments. The fact is that the big Whalers from the 1980's often had some anount of these irregularities and it was caused by the foam shrinking over time. The bi-directional mat, woven at 90 degrees, provides great strength in two directions of tension. I've always felt that Whaler should have made their hulls more puncture resistent by making the outer skin thicker, or by adding a layers of something like Kevlar (CPD did it on some military applications). RS Chopper Gun. and the flybridge wants to keep going forward.Both hand-laid glass and foam injected skins have proven themselves worthy construction techniques. I doubt it is done under pressure though. And the greater the separation, the greater the strength.In a Whaler, you have the same thing - the two 'shells' (flanges) separated by the foam (web). The longer the fiber and the more controlled the orientation, the stronger the object since the longer, strategically-placed fibers can disperse more energy to other neighboring fibers to distribute the loads/force. But since A has more cross-sectional area (because it is thicker) than B, the two end up having the So then, you ask, what is the big deal and why all the touting of vacuum infusion over hand lay-up? JavaScript is disabled. It was most prevalent in the early 18 Outrages, but the problem was recitified (I don't know how). Hand laid cars take an extremely long time because of multiple layers of cloth, and mat and core mat can be used. Hand lay-up by the right person will produce a better part and tend to get the right resin to fiber ratio and the right resin to catalyst ratio as wellA forum community dedicated to Small Skiff owners and enthusiasts. They would frequently test foam by pouring a measured amount on the floor and then measure the expansion rate.

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