The specified technical requirements included a 1,100 m (3,610 ft) takeoff distance over a 15 m (49 ft) obstacle, the capability to operate from semi-prepared grass airstrips and roads, a maximum speed of Mach 0.95, a range of 280 km (170 mi) with 10 minutes over the target while possessing a maximum of 2,200 kg (4,850 lb) empty weight and 4,700 kg (10,360 lb) max weight. Equipment requirements were the presence of armoured protection for the pilot and the fuel tanks along with alternative arrangements of 4 × 12.7 mm (.5 in) machine guns or 2 × 20 mm or 30 mm autocannon. These operational specifications were viewed as not being straightforward to fulfil at that time.