“I won’t go into too much detail with the physics only to say that in rowing it’s actually the boat that moves back and forwards the most each stroke (relative to the water), and on this machine it’s the flywheel that moves the most each stroke (relative to the ground). The aim of the Rowperfect is for the net effect of flywheel and bodyweight to remain stationary during each stroke, and for most of the energy to be transferred into spinning the flywheel. In a fixed flywheel, a lot of energy is wasted in simply moving the body backwards and forwards.”

David Cameron
Rowing MagOZine September 2005

 

For the correct simulation of the dynamics of a racing shell, at both turning points, at the catch and at the finish, the moving mass of the flywheel/stretcher combination is essential to train the correct coordination and timing. In addition to that, the speed/force relation of
the handle during the stroke should also be as identical as possible to that in the boat, because this is essential to have a good "feel" during the stroke itself.

A good simulation of the "feel” during the stroke itself can only be obtained when the following condition is met: The kinetic energy of the rotation of the flywheel at the average flywheel speed during a stroke should be equivalent to the kinetic energy of the translation of the boat at the average boat speed during a stroke.

This condition is met by the combination of sprocket size and the moment of inertia of the flywheel of the Rowperfect It then results in the same drive time (same speed of muscle contraction) as in the boat; provided the correct resistance disk is chosen.

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