I was sugestted to use eight U11 T-Motor (see: http://www.rctigermotor.com/html/2013/Power-Type_0928/93.html).
Tested at 50 V with a 26*8.5CF T-MOTOR propeller, an U11 lifts 12.42 kg. So, eight U11 units will be enough to hover 99.36 kg drawing 379.2 A (379.2 A x 50 V = 18.96 kW) in total.
A...