how to make a fiberglass hull to a 56 footer

[rivadezza]

I have a 56 fot mould set and want to make a hull, how to make the hull light and what materials should be used and where. Money is not an object in this boat. No wood, plywood will be used.

[PAR]

Hire a designer and have them work up a laminate schedule for you. It's likely you'll need a few other items figured out as well so don't spare the whip. You just can't guess about laminate schedules on a craft of this scale. Use your money wisely and hire a professional or possibly buy the original plans for the very molds you own.

[rivadezza]

Originally Posted by PAR

Hire a designer and have them work up a laminate schedule for you. It's likely you'll need a few other items figured out as well so don't spare the whip. You just can't guess about laminate schedules on a craft of this scale. Use your money wisely and hire a professional or possibly buy the original plans for the very molds you own.

I have made the hull myself upon latest technology from Norway, I was suggested to make a 450 chopmat/ 600 wowen rowing mix and 2x 4mm coremat upto a thickness of 27 mm ( 1,1 inch)

I would very much like to have oppinions and or a address where I can get calculations for the lightest and strongest solution since weight is my biggest enemy

[kengrome]

What have you actually built? The hull? The molds? Both?

I don't know why weight would be your enemy unless this is a planing hull. Is it?

If it's a planing hull you REALLY need to stop asking questions that novices cannot answer -- and consult a qualified and experienced engineer or naval artchitect as Paul already suggested.

[rivadezza]

The boat has 1720 hp and 2 surface drives, I guess I cant get a shortcut on this site for some free advice

[rivadezza]

I have built all of it, have previouse experience with boats upto 46 foot,, but this is 56,,, not big differance in sice but big in construction

[kengrome]

I guess I cant get a shortcut on this site for some free advice.

Absolutely not!

For crying out loud, this is a public forum not a professional consulting service! If you want good answers to the questions you've been asking, you are simply going to have to hire a professional.

PAR already gave you the best answer you can expect to get in this forum. You can "do the right thing" and take his advice ... or you can 'take a chance' and build the boat however you feel like building it, and hope that no one gets killed if it breaks apart because it wasn't built properly.

[rivadezza]

I actually got all the information, if you need support, antime, I have a lot of inside info from the big producers in Scandinavia and Italy. Are you building boats for fun or for living ??

[PAR]

Laminates schedules are engineered for anticipated loads. You can guess at the engineering at which point, you will likely be heavier then necessary or you can hire an engineer who will design a structure and schedule that addresses the loads with minimum of materials, saving you money and improving performance.

There are any short cuts, as I mentioned. It's a bit like asking a doctor what's wrong, because your finger hurts and insisting on a diagnoses. He needs to know what happened, how it hurts, etc. before he can make a reasonable assessment of your needs. He'll also charge you for it too.

Considering the cost of a vessel of this class, the fees you need to absorb for the necessary calculations, will be a small fraction of the total project outlay. It makes me wonder what other "corners" you'll be trying to "shave" in the production process.

[kengrome]

Considering the cost of a vessel of this class, the fees you need to absorb for the necessary calculations, will be a small fraction of the total project outlay. It makes me wonder what other "corners" you'll be trying to "shave" in the production process.

This is what scares me about this guy, Paul. He comes here asking highly technical questions without providing any of the required data a person might need in order to answer him -- such as explaining that it's a high speed planing boat for starters -- then less than three hours after he says:

I guess I cant get a shortcut on this site for some free advice

... he makes this follow-up claim:

I actually got all the information ...

... and just imagine, this is all coming from a guy who also claims on his website:

With our extensive experience, Rivadezza has developed a reputation for doing the little things right.

Maybe he does the little thing right but screws up the big things.

[rivadezza]

well, nice comment, just imagine if you will ever be able to achieve what we have done,,, feel sorry for your personal disorders, you might understand and accept that you are a small man in reality and try to be the same here on the site, it takes a man to realize all the above,,,,,

Have a nice day

[Herman]

56 ft, 1720 hp, 2 surface drives. Speed well over 30 knots I guess. Possibly in the 35-45 knt range. Probably ocean going.

This is the only info you give. To say at least a bit more, other things need to be known:

-you say you have moulds. What kind of moulds? Female tooling, a set of building frames? If frames, what is the spacing?
-available materials. You mention 450 mat and 600 roving, with Core-mat. This sounds very 1980's to me, and surely not to be considered light weight.
-available knowlegde, both with you, the yard, the workers and the suppliers.

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Based on the info you have given us, I can advice you to hire a professional building manager, a skilled architect, or outsource the project. Projects with such a magnitude are hardly possible to tackle based on the info the forum can give you, and the info you give the forum.