2. In the ship model competition, one type (class F) is the racing sailboat.
Relying entirely on the wind, the speed is not slow.
3. The interior of the model ship is generally empty and equipped with some equipment, but it is divided into two parts.
The cloth is uneven, so it generally does not sink horizontally when sinking.
Depending on the counterweight, lean to the bow or stern and sink (mostly to the stern).