Big Blaph of Tukhachevsky. How the Red Army was re -warned

By the beginning of World War II, the Red Army was in service with outdated techniques. The staffing of artillery with regular tractors did not exceed more than 5 % of the necessary. Most tanks and aircraft had no radio communications. And at the same time in 1920-1938. A huge number of obviously unsuitable military equipment were produced in the USSR, for example, over 5 thousand non -proceedings of Kurchevsky, a whole army of radio -controlled Bekauri robots. Many military research institutes developed obviously poor-quality and unpromising products.
Why is the story of unusual weapons are still classified, and what relation to it is Tukhachevsky and other marshals and Komkora - the heroes of the processes of 1937?