Small scale cargo boat

[schoolproject]

The boat must be 24x34x14cm or less must weigh less than 500 grams and be able to hold 3000grams for 1 minute through wave testing

Try to keep the materials and designs simple and cheap.

Sorry I didn't answer before - I still think in inches and ounces rather than cm and grams: using the Unit Converter at http://www.digitaldutch.com/unitconverter/ that's 9.4" W x 13.3" L x 5.5" H or 9 x 13 x 5 and needs to support around 6.6 pounds and weigh less than 1.1 pounds.

I guess a good question would be how vigorous the wave testing is and what the critera is for "seaworthiness" - is the object just to not sink? If it's only for one minute I would think a barge like design built from foam core or even painted mat board would do the job just fine - maybe a few light balsa supports. I think you could even do a two chambered bottom with a few bulkheads inbetween so it would be less prone to sink and still stay under the weight limit.

two chambered bottom

Unless you need the structure to support a concentrated weight, better to keep the weight down as low as possible for stability. A bit of curvature or V will help it break the impact of the waves as opposed to going with a flat bottom and straight bowed barge, and the V or curved structure will help add stiffness. Sounds like a fun project. Let us know how it turns out.

[schoolproject]

i was thinking of a cone bttom a v is for moving vessles this one doesn't need to move a cone would support all the waves right?