Attach ballast weights to the floor of your model ​ — such as a few evenly spaced coins held in place with tape or glue — ​ until it floats with between a third and a half of its height under water.
وللمحافظة على توازن الفلك ،‏ ألصق بعض القطع النقدية على ارضيته الى ان يصبح ثلث الى نصف وزنه تحت الماء .‏