Max, I think your calcs are a bit out. 4.5kg & 0.57m square, gives 9.7kg/m square.Max Wright wrote: ↑24 Oct 2020, 22:08 When I lifted the assembled model, it seemed extra heavy. So I stepped on to the scales, deducted my 90 kg and the residue was 4.5 kg. The wings together have an area of 0.570 m² = wing loading of 126 grams/m².
This equates to nearly 26oz/sq ft in old imperial money - which is a bit heavier than the 16oz/sq ft area I would expect. If that is correct then it might need a good blow to stay up!