I was wondering if maybe an early cat class in England like the Shearwater had invented it but maybe not. A Swiss person emailed me this photo with the following text: Hi,
I am not subscribed to the Catsailor Forum, hence the private response.
The first rotating wing mast on a catamaran was probably A. S. deW. Herreshoff's catamaran Seaspider, built in Bristol R.I. at the Herreshoff Manufacturing Company in November 1944. Sidney Herreshoff was the son of the great Nathanael G. Herreshoff.
I am attaching a photo of Seaspider sailing in around 1945. When you look at the diamonds you can clearly see just how much the mast is rotated.
