JQA Type Afterward Retractable Fin Stabilizer

The JQA type retractable fin stabilizer is composed of actuators, fins, fin boxes, hydraulic units, and electrical units, etc. The fins are fixed on the port and starboard bilge of the ship respectively. When the stabilizer is used, fins are spread out from the fin boxes, and when the stabilizer is not used, they are housed in the fins boxes. The fins of this type of stabilizer are housed afterward into the fin boxes.

Modular design. The actuators and the outboard of the ship form a segmented hull module in order to minimize the work of installation in the shipyard.
When not used, fins housed into the fin boxes.
When the fins housed in the fin boxes, the edge of the fins can cover more openings of the fin boxes. This can reduce the drag made by the openings on the fin boxes when the ships sails under any sea condition. It can help to increase the speed.
Good reliability.
Adopt flapped fins, so they have high lift coefficient. They can increase 50% more capability of lifting compared with non-retractable fin stability with same area. The lift coefficient of flapped fins is 11% higher than fish-tailed fins. The lift coefficient of fish-tailed and flapped fins is 20% higher than fishtailed fins.
Suitable for middle and large size ships which have fat bilge.