chopper gun vs hand laid fiberglass

It is also true that chopper gunned boats are generally speaking a cheaper hull but that is not the case in a Whaler because it is not just the individual skin that is providing the strength.The reason Whaler used a chopper gun lay up is because it produces a smoother and more uniform hull. The dealer (Searay) mentioned that Whalers have always had a total chopper gun hull and no handlaid roving fabric. A chopper gun essentially mixes glass fibers, resin, and catalyst in mid air as it is sprayed onto the mold.

"Built Tough to Reliably Compete and Win.

This was the "I'm not sure about this" logic and "let's be safe and add some more".

Good discussion.Nobody thinks that Whalers will absorb water like a sponge.

It is the separation of the fiberglass shells that provides the strength. There is a whole science to advance composition lamination schedules (how the reinforcements are oriented). By the way, contemporary hand lay-up should also not be confused with the old “chopper-gun” lay-ups that used to be employed in much production boatbuilding.

The caption on the picture said "Now what?"

Do Gheenoes use any cloth, or are they all chop?

Now, the strength we are talking about here is in 'bending' and not compression or tension.

Fiberglass designers have more sophisticated techiniques of designing now than in the old days. Excess resin results in extra weight, which does not equate to extra strength. They were so sure of the problem, they had a list of hulls that were potential puckerers.The famous picture of the bulldozer sitting on a Whaler came from a western dealer who had been asked to destroy a puckering hull and provide documentation. A Contender has little to no chop in the hull lay up. Not all lay-up schedules or reinforcements are the same eventhough the object may appear identical. The old chopper-gun laminates were built up quickly using a resin gun that simultaneously sprayed catalyzed resin while chopping up glass filaments and feeding them into the gun’s resin stream on the run. Dave Areas such as the keel, strakes, and sponsons are reinforced with woven glass to provide extra strength primarily because these areas are subjected to extra stress when trailering.

I saw one returned under warranty lying in the yard (waiting to be destroyed) at Jacobsen's Boats & Motors here in Seattle in about 1986. Copyright © 2018 by Phil Friedman and Seattle Yachts — All Rights Reserved RS Chopper Gun.

The old chopper-gun laminates were built up quickly using a resin gun that simultaneously sprayed catalyzed resin while chopping up glass filaments and feeding them into the gun’s resin stream on the run.

A Whaler is the combination of the two skins and the foam between them. 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.

But, as I noted at the Whaler plant in Edgewater - those chopper gun operators know what they are doing - they are good. This is how bridge beams are constructed to hold tension- an internal web of rebar. Additional weaves and/or offset layers add the multidirectional tensile requirements. The volume of the hull or boat, by itself, doesn't make any difference.The puckering problem that Tom mentions could be caused by the cooling characteristics of the foam. Chopper guns cut a rope glass and mixes it with resin. It is a long term problem that does not develop for months or even several years.For example, Larry Goltz (lhg) had several times reported that as a result of his Outrage 25 being rack stored for a while, it began to get subtle indentations in its sides. But that relatively rough surface also plays an important role as it helps the bonding with the foam.The orientation of the glass fibers is most important. Generally, the optimum ratio of reinforcing fabric to resin polymer is considered to be 70/30 by finished (post-cured) weight. But this really has very little to do with the surfboard-type design, strength and construction (handlaid or not) of the Whaler, which is why I bought one. Phoenix for Design and Manufacture of Plural Spray Guns, Pump System Equipment and Monitoring Systems for the Fiberglass/Composite Industry.

that's a lot of pressure.I agree with what Jerry and Dave are saying about chopper versus hand laid. Enough--Happy New Year, you nice folks -- it's almost 10 pm here and the wife and I are heading out to do another kind of wailing!TonyThe fact is, just about every major manufacturer uses chopper to prevent the following layers of mat and roving from showing throught the gelcoat.

That is, as the foam is injected and expands, it heats up and in the process, bonds to the fiberglass shells.

Hand laid cars take an extremely long time because of multiple layers of cloth, and mat and core mat can be used. --- Jerry/IdahoWell summarized.


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