sentences:  Another possible reason behind the rocking wing idea not progressing beyond Watson's experiments was that it could only be applied to relatively light and small aircraft.Had Preston Watson survived, it is possible that with continual experience flying his aeroplanes he would have thought up an ingenious solution to this problem.Although he would have had to forsake, in his mind, the biggest advantage of his system over contemporaries, the simplicity of operation of the rocking wing method (by a single control lever for pitch and roll), by perhaps adding another actuating device to adequately control his aeroplane.