rule the waves

Tohmei Group focuses on aircraft manufacturing, such as space station replenishment equipment (HTV)
We are engaged in panel assembly of domestic rocket, not only the power of manufacturing
Excellent quality management system is highly appreciated.

"ARG" is made by taking advantage of
our technical capabilities.

Our Simple Design

We design and build functional Anti Rolling Gyro Marine Stabilizers

Theory Of Our System

Principal of the "ARG"

ARG is applied to the excellent “Control Moment Gyro” Principal. If the rotated Gyro is inclined sideways, which generates the Gyro force to incline it toward the front and rear direction.

This is the principal of the Gyro scope.

Angular momentum H of ARG’s flywheel and roll angular velocity Φ produce gyro torque Tg in accordance with the Gyro principal. Tg = H x Φ

If damper C exists, Tg would rotate the gimbal with angular velocity マエ.マエ = Tg/C

On the other side, H and マエ produce suppression torque Ts also in accordance with the gyro principal. Ts=Hxマエ

Then, Ts acts as suppression torque with proportional to boat rolling angular velocity Φ Ts= (H^2/C)xΦ


Why ARG "Our Advantage"

By using the “Gyro Momentum Effect”, the Anti Rolling Gyro, ARG, reduces the ‘rolling’ motion of your vessel to a point where you will barely feel it. Cooking on the stove is safer. Drinks can sit on the table without worry of spilling, and many other advantages. Enjoy your vessel when others are ‘hanging on!’

Top 10 reasons why the ARG (passive system) is better than the other systems:

  1. Easy to operate; just flip a switch to turn it on.
  2. Effective at trolling and zero speeds.
  3. Resistance free because nothing protrudes from the hull.
  4. There are no complicated high pressure hydraulic lines or pumps.
  5. There are no fresh or raw water pumps, no heat exchangers to leak.
  6. No vacuum chambers to maintain.
  7. No exposed moving parts means that the ARG is safe in an engine room setting.
  8. Can be installed anywhere there is sufficient strength.
  9. In short, the ARG is a time tested, proven, dependable design that is practically maintenance free.
  10. With more than 25 years of experience, ARG is the leader in the marine gyro stabilization field.

The Tohmei Anti Rolling Gyro (ARG) is safely installed inside of the boat and away from the extreme conditions at sea. The ARG requires no external water hookups, no hi-pressure oil lines, and no exposed moving parts making it safer and more reliable for everyday use.

Captains conclude that fishing with a Tohmei Gyro onboard is much easier on their legs and it allows them to fish longer and feel better after a day on the water. Running for a rod with a big catch can be quite dangerous on a rocking boat but with an ARG unit installed you can move freely and safely. "Rule the Waves" and be able to go out to sea when others can't with a Tohmei ARG. The only way to fish!

Simple ARG Construction


Patents: the United States, Japan, Italy, the United Kingdom, France, Spain, Sweden, Germany, the Netherlands, Australia, Taiwan, and New Zealand


Competitive Comparison

While other stabilizer systems, such as active gyro made by Competitor, Inc and fin stabilizers, require complicated wiring, pumps and heat exchangers for water cooling, high pressure hydraulic pump and lines and a vacuum system. We keep it SIMPLE! We believe that Simple is the best way to provide our customers a pleasurable experience on the water with a touch of a switch. Mitsubishi and Tohmei spent years developing the simplest, most effective form of gyro stabilizer before the competition even got started! The facts show that the ARG provides more damping for the dollar. For example, active gyro made by Competitor, Inc claims that the generate angular moment 9,000Nms, but the actual anti rolling torque is 18,810Nms. on the other hand, our ARG250T generates 5,000Nms, but anti rolling torque, the most important factor of damping, is 25,000Nm. We provide more damping torque than the active gyro made by Competitor, Inc.

In the early years of developing the ARG, when Mitsubishi was involved with attitude controlling for space satellite, an exceptionally responsive and dependable passive system was developed. We learned that the more complicated a gyro system becomes; the more likely it is to fail prematurely.

"We Have Been There And Done That!"

We rejected the pumps and lines associated with water and hydraulic systems, and did away with computer controls that caused problems. We kept what works and that is what you get with a Tohmei ARG. The computer control system is used by the active gyro stabilizer, such as Competitor, Inc but as we all know, in a humid and salty environment, this can cause a lot of problems.

We Believe That Keeping It Simple Is The Best

The Tohmei Anti Rolling Gyro (ARG) is the passive gyro stabilizer system that achieves ‘hassle-free’ operation and provides better roll reduction. Anti Rolling Rate is calculated by the following formula:

Anti Rolling Rate(Nm) = Angular Moment(Nms) x maximum limit of gimbal angular velocity (rad/sec)

ARG125T: 2,500Nms x 5rad/sec = 12,500Nm (actual maximum rolling torque)

ARG250T: 5,000Nms x 5rad/sec = 25,000Nm

ARG375T: 7,500Nms x 5rad/sec = 37,500Nm

Competitor 9; 18,810Nm