 Two further modified Hs 130A-0s was produced under the designation Hs 130A-0/U6 and featured a greater wingspan, DB 605B engines, Hirth superchargers, GM-1 nitrous oxide power boosting, and under-wing drop tanks, and being ready for flight testing in November 1943, demonstrating an absolute ceiling of 15,500 m (50,570 ft).The Hs 130A-0/U6 variant as well as the other Hs 130A-0s proved unsatisfactory and were never flown operationally.Further development of the Hs 130 led to bomber variants.