1. Straighten the paper clip and connect it with iron wire to form a cuboid skeleton with a length of 2 1.5 cm, a width of 12.5 cm and a height of 4 cm. The skeleton should be compact, the skeleton on the side of the boat must be firm, not deformed by extrusion, and it should be easy to paste paper (because when the boat is loaded with heavy objects, the water will produce great inward extrusion pressure on the side of the boat).

2. Because there is no transparent tape, and the glue may affect the adhesion when it meets water, it is best not to cut A4 paper to prevent water leakage. Instead, two rectangular box-shaped boats (which can be folded with a piece of A4 paper, and the volume is close to the largest cuboid) are folded, and the folded parts are fixed with paper clips.

3. Put the skeleton in, stick the edges of the box on the skeleton, and connect them together with paper clips, and it will become a double-warehouse ship. So in theory, two boxes can generate buoyancy of not less than 20 Newton, and can float 2 kilograms of objects. ?

A coin of 1 yuan is 6.05g, which can hold at least 3 10 coins, excluding the weight of the ship. ?

4. Coins can't be scattered, so the ship must be supported by the support of coins, so you can first lay a layer of coins on the bottom of the ship, and then stack the coins into a cylinder as wide as the ship to support the wide side of the ship and also support the captain's side to resist the inward squeezing force of water on the ship.

5. If it is not stipulated in the rules to put the boat into the water first and then add coins to the boat, you can put some coins in the above way before entering the water, then hold the bottom of the boat and put the boat into the water, and add coins as appropriate, which can reduce the time for the boat to soak in the water.