A Drive for Airscrews on Models: A Small Multiple Output Gearbox and its Application to Driving Airscrews in Wind Tunnel Experiments

THE problem of driving the airscrews on models of large multi‐engined aeroplanes is complicated by the small size of the fuselages and engine nacelles on the model and the consequent severe restriction on the size of the driving mechanisms to avoid undue interference with the shapes of the component parts of the models. Where a motor of the N.P.L. induction type can be fitted into the model fuselage the problem resolves itself into the provision of a suitable gearbox, and method of power transmission from the gearbox to the airscrews.