Fins vs Gyros (Fins vs Gyros)
Rolling is the main cause of seasickness, another big factor is yawing, moving from side to side. You don't notice the yawing that much, it can be very subtle, but it can affect people a lot. It's not so much the degree of motion - how many degrees the boat rolls or how many feet it moves when it yaws - that affects seasickness, but the combination of the angle, frequency and acceleration of that motion. If you can reduce the degree and acceleration of rolling, you can go a long way toward reducing seasickness. Another factor is that the frequency of the wave makes the difference - that's the time from the crest of one wave to the crest of the next. There is also something called the "roll period" of the boat. This is the time it takes for a boat to roll from one side to the other and then back to the center. A roll period of 3.5 to 4 seconds is what people are most sensitive to when it comes to motion sickness.
What stabilizers increase comfort on board
Vector fins (Fins) in particular can make a big difference in yaw, roll and sway. This is good because the last two are the movements most likely to cause seasickness. Since gyros (gyros) do not have a direct point of contact with the water, they do not affect yaw. In addition, the performance of Vector fins increases exponentially with speed and that they generate both lift and stability, which neutralizes the effect of drag. Vector fins provide stabilization both at rest and while cruising, and allow you to keep from leaning in turns. They counteract crosswinds and list, are lighter than gyros, and allow bearings and cylinders to be serviced in place.
Stabilizers that use hydraulic drive can usually use a PTO hydraulic pump (power take-off) on the boat's engine to provide power while the boat is moving (at rest, AC power is used from a genset or the batteries). An accumulator in the system means less noise and immediate response. In practice, the system is virtually silent.
Gyroscopes, on the other hand, work best when the boat is stationary or moving at slow speeds. Larger gyros are needed to provide good stabilization even while the boat is moving. This also requires an analysis of how the boat is used and when the highest performance is most important.
Gyroscopes have no accessories, they are relatively small and compact, and they are well designed to minimize the intense heat generated at the bearings by the rotating mass. Gyroscopes have an attractive appearance, and work well in many operating conditions.
Depending on the size of the Bering yacht, we recommend either fins or gyro stabilizers.
Side Power Fins Video: https://youtu.be/DazGorJiVF4?t=13
Seakeeper Gyro Video: https://youtu.be/rw7Ox4pQeRA
