Vane sailing, must be fairly old? Do you know any more of it's history? I've got the sail winch working again on mine and it's been in the water a few times. Needs more attention to sail rigging. At present there's either no wind or too strong wind. I sail at a pond at Pickie Fun Park in Bangor Co.Down
Used to visit Portsmouth while my son was in the RN

Looks great...Sirs well in the water too.

Many Thanks Biggles for the sail plan from Roger Stollery. I think my Orange Mystery is a mystery no longer. Thanks to all who contributed