Carriage speed, carriage is attached to the model by the dynamometer. So, as long as the carriage, what force the carriage takes we are not bother, the dynamometer, that pillar, what force it exerts on the model that we are bothered, that we measure through a strain gauge type of measurement between the pillar and the housing that is held. So, if the housing is exerting a force in the pillar to pull it, that is measured through a strain gauge type of instrument. And similarly, we can measure the sinkage and trim. So, this is how the model experiment is conducted.