I looked up the figures on that link for the SK-1....
Quite remarkable.
Edited version..
• Take-off to 50ft at 750 Kg 685 m.
• Landing from 50 ft. at 650 Kg 595 m.
• Max speed at sea level 288 kts (535 Km/h)
• Max cruise 242 kts ( 450 km/h).
• Climb 1850 ft/min.
• Vne 349 kts (645 km/h).
• Range 1160 km.
• Stress limits +/- 6 g
Empty weight 343 Kg.