This must be the best sell pitch ever or just their fantasy.
But still, if somebody can come up with a formula ( battery size , prop size,
motor ) to get at less 50% of that it would be great .
This are the specs for the MD4-1000 from the MicroDrones
Empty weight 2650g
Max payload weight 1200g
Take-off weight ~5500g
Size 102cm rotoraxis-rotoraxis
Flight duration up to 60 min
Operating distance up to 2000m
Battery cell LiPo 9000, 18000 or 27000 mAh
Wind tolerance 12 m/s
yes, but it's one thing to test it with no wind and with ground pressure at low altitude - and even stripped off landing gear - those people sell these numbers right beside promises of big payload or strong wind resistance.