As the tiltrotor gradually approached practicality in the 1960s, more projects began to emerge. As predicted by Baynes, the development of small but powerful turbine engines made the pivoting nacelle a much more attractive proposition than complex shaft-driven rotors. In West Germany, Weserflug Flugzeugbau updated ideas it had developed in the 1940s to create the WFG P16/P23/P24 series (a model of the P16 is seen here). In Weser’s wartime designs, the outer portion of wing swivelled with nacelle attached. In its 1960s designs, only the nacelles pivoted. These were proposed as executive transports, passenger aircraft and even an anti-helicopter combat aircraft.