Previously, in RBN 2021/10, it was hypothesised that the rotation of the blade in the water during the drive may consume energy and reduce the propulsive force and power within the rower-boat system, and here we provide further analysis of this effect. New BioRow developments allowed us to measure some variables with different sensors and cross-validate the methods. E.g., the normal handle force was measured simultaneously using the method of two torques on the inboard Fh(M) (RBN 2020/10) and directly with the 4D sensor inside the handle grip Fh(F) (RBN 2021/06). Concluding, for the first time, we were able to estimate experimentally the losses of force/power caused by the blade rotation in the water. Still more work required to decide if ~20% of force difference above is real losses, or it is just overestimation of the blade force measured with torques method. There will be further comprehensive evaluation of the blade efficiency and comparison of various blades and techniques in the future…
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