Frank Bethwaite often claimed, during the course of boat shows over the years from about the mid 60's to the mid 80's, that HE was the "inventor" of the "rotating aerofoil mast". He used to say that his design, the NS 14 was the first boat (mono or multi) that incorporated it. Like a lot of things that Frank attributes to himself, either verbally or written, it was incorrect and just one other thing of many that he plagiarised from some one/some where else.