Designing a 25-30ft boat with a HDPE hull

[Richard Hillsid]

Yep.

I have tried painting them and other stuff, just can’t get it right. So aluminium is my game.

If someone gets it right and there are many chemists working on it, imagine milk cartons with a reflection would sell better too.

[mattosmond]

would a recycled aluminium hull cost a lot or not?
Do you use recycled materials?

[catmando2]

I still reckon you'd have to adress the weight issue, you'll need more h/p than a composite design.

Dave

[Richard Hillsid]

Originally Posted by mattosmond

would a recycled aluminium hull cost a lot or not?
Do you use recycled materials?

In my humble opinion aluminium is a cheap material to build hulls, and hulls are cheap compared to a finished boat.

Sure do, we recycle our beer and soda cans and every now and the I think one is in the sheet im taking, aluminium recycling is easy, I sell all our scrap, we have seperte containers for it, and I know for sure it gets re used, I have played with the idea of a solar furnace to melt the aluminium scrap into ingots but that would not help producing a new boat as the sheets and profiles have to be of special grade, but all in all aluminium boats can be recycled.

[mattosmond]

Well Ricard i think i will defo entertain the ideao f the aluminium hull, is the right smooth or do you get quite a metallic sound, and sorry one more question, do you need more bhp than a fibre glass hull?

Catmando2: Can you recycle composite hulls or are they just as hard ot re-use as fibreglass.

I have heard in england there is some goverment funded research into grinding the hulls down into pellets to be used as under road hardcore, mixed with normal hardcore.....

[mattosmond]

how about rotational moulding? if it were to be on a largish scale... as i have other style boats i can attach this idea to....

[ersyncar]

i am working on a shipyard which produces HDPE (high density poliethilen) boats as boat designer and naval architect. if u want u can connect me by mail. ersinkar@msn.com is my mail and www.deltaqua.com is our website.

until today i have designed boat 4,5, 8,5m , 10m and 12m boats and we built 109 boat in 2006.

Good luck..
Ersin KAR
DELTA SHIPYARD (istanbul)

[mattosmond]

ersyncar:

thanks for the link to your website, it is very interesting. how much are your boats to buy?
You seem to have some pretty good engine size to speed statistics....

[ersyncar]

To tell a price for boats is not so possible because there lots of changeable accessories and machines.But if you want a very general price just for HDPE boat (not including engines,pumbs or any other accessories). For a 8,5 meter boat selling price is about € 12000, (this includes HDPE plaques and pipes, waterjet cutting,workers pay,and engineering calculations)
this boat's built in about 10 days in our shipyard. and engines and waterjet prices are very very changable. For example we use deawoo,yanmar and volvo engines; american turbine, hamilton waterjets propulsions.
if cheap price is important for you you can choose deawoo and american turbine jet. but if you really want to have high quality and performance i advice yanmar or cummins engine and hamilton jet.
For technical datas you can mail me.
Good luck to you..
ErsynCAR

[alaskamokaiman]

I seen the mould and heard the costs for the mould, a 20-30 footer would be lots of cash and you would need a really large heating unit.
I don't think that the hdpe they use is recycled material but they have a great boat I have owned them for over 3 years held up great. I have had them in cold temps. down to -30 plus have not seen how they hold up in 100 degree plus.
They are very tough I use them as ice breakers in the spring, one boat has over 125 miles of ice breaking time and shows no damage. At 12 feet they do flex.
If you would like to see it...mokai.com.

[ersyncar]

no we used recycled metarials.

[dondelmundo]

Hi Matt,

This is too late for your class but polyethylene modular hulls are manufactured by the folks at www.rotonics.com. USCG approved stuff.

[Man Overboard]

I think there is a need for very inexpensive canoe shells for rental companies that are located on rivers. Rocks destroy canoes and kayaks in a fairly short period of time; customers don't treat rental property with much respect. There is a river canoe rental company down the road from my business; they have to dispose of a canoe after 1 to 2 seasons. If the price was right, a rental company would overlook some of the negatives of a big plastic canoe. HDPE may be an appropriate solution to a low cost shell.

[spyro1123]

Originally Posted by Man Overboard

I think there is a need for very inexpensive canoe shells for rental companies that are located on rivers. Rocks destroy canoes and kayaks in a fairly short period of time; customers don't treat rental property with much respect. There is a river canoe rental company down the road from my business; they have to dispose of a canoe after 1 to 2 seasons. If the price was right, a rental company would overlook some of the negatives of a big plastic canoe. HDPE may be an appropriate solution to a low cost shell.

Mad river canoe already makes Rotomolded hdpe canoes...they are ugly, a little heavy, but would work for a rental.