Jetjr
Stall speed often doesnt rise nearly as fast with weight as many believe.
The J400, mentioned above, gains just 3 kts stall speed when going from 544kg to 700kg
The figures for the J400 don't quite add up.
From their website, 544 kg - 45 kts stall, 700 kg - 48 kts stall.
Stall speed increases by the square root of the load factor.
544 kg to 700 kg represents a load factor increase of 1.285.
The square root of 1.285 X 45 kts = 51 knots, - a 6 knot increase, double what's quoted.