Gyroscopic exercise tool

The Gyrotwister ( known on the basis of Greek γύρος, " roundabout " or " round ", also under the brand name Dynabee, Powerball, Rollerball, Bushido ball, spin ball, Timmi Ball, Twister Maxx or Gyro Exerciser ) is a tennis ball big toy or exercise equipment. This ball is a 200 g heavy flywheel having an axis is mounted in a groove around the " equator" of the ball. The flywheel can be accelerated by a circular motion of the hand and reaches up to 16,000 revolutions / min. The resulting centrifugal forces put these movements but a considerable resistance to, hence the GyroTwister comes in different sports (eg in ( table ) tennis and climbing ) as a training tool for strengthening the wrist and forearm muscles used.

Operation

The rotor axis is an axis that is freely movable through this slot perpendicular to the rotor axis. When the rotating gyroscope starts to precess in the following, a deflection centrifugal forces, the rotor axis is pressed at its two ends to the respective top and bottom of the groove, that the shaft ends each roll in such wheels. By rolling the gyro axis is tilted, and the precession is maintained.

The friction in the groove and the rolling of the axle ends are thus of essential importance for the function of GyroTwisters, since the gyro precession can perform without any energy. An oiled Twister can not work therefore.

By hand movements that counteract or give in to the torque of the precessing gyroscope axis, can accelerate or decelerate the roundabout. Is not this done gently, slipping the top shaft in the groove and brakes the spinning top. Especially at low speeds, the exerciser need for some exercise.

Also, the diameter of the axle ends plays a crucial role in the transmission of torque from the groove on the top shaft. If the axis is too thin, the precessional movement of the gyroscope would overtake the rolling speed of the spindle ends in the groove and the gyro would be decelerated or it would not generate a sufficient contact pressure of the spindle ends in the groove. If the axis is too thick, the rolling speed of the axle ends would overtake the precession and the axle ends would start to slip or the need to speed rolling hand movements would be too large to be executed by the wrist can.

Despite their low weight, considerable forces of more than 150 N can occur at 10,000 revolutions per minute ( which is about the power that is needed for lifting of 15 kg). There is software to measure this speed acoustically.

Go to " start " of the gyro a cord is wrapped around its equator and quickly peeled off; many experienced cyclists make it even with a Daumenschnipser.

After the success of the first device different replicas another name appeared on the market. The manufacturer even brought a more advanced model on the market that has a built- generator internally mounted LEDs to light up different brightness depending on the speed.