Hi Colin,
Thank you again for your efforts to help us. The plan and photos were very useful as they have confirmed, at least in my mind, that LaSwan is definitely not a Genie (and I dont think the one on the VMYG website is either).
There are too many differences in hull shape even to make it likely that it was based on the Genie design. LaSwan has a much more raked bow, wider hull, longer skeg and rudder and differently shaped transom. There are lots of other differences as well. The layout of the sheets is different to that shown on the plan and the mast is stepped on the deck not the bottom of the hull.
Its obviously of the same era a Genie but made to a different, though similar design, perhaps still by Vic Smeed. I am still puzzled about the length. Most model yachts of this size would have been built to comply with a definite racing class requirement. The Marblehead class was very popular around that time (and still is today), but why design or build a hull 1 inch longer than the fundamental Marblehead rule of 50 inches overall length? Still its early days and someone might come up with the answer eventually.
Regards
Gareth