Without inspiration the RG 65 name is FS65 I.
The new sail, with maximum area, 1.0 m height.
Unfortunately the balsa hull was too heavy.
The total weight is 1270 g + 150 g rig / sail giving a total of 1420 g with 500 g bulb and 0.50 m keel.
The design hull weight is 1100 g, it soon became heavier than expected at 320 g.
The next hull fiber will be lighter and using a carbon rig should do a little better.