Experiments on a Capp-Anemometer in Pitching and Rolling Motion

Abstract

A cup-anemometer model is oscillated in the current of wind tunnel to simulate ship installation in pitching and rolling motion. The mean rotational speed of the anemometer is found larger by a certain amount during the oscillation than in the steady case. This result is contrary to the case of combination anemometer and wind vane, where a certain under-speed is observed in its mean value.