the result was a conventional strut-braced monoplane with fixed landing gear. a pair of kurchevsky apk (apk - "aviatsionnaya pushka kurchevsky" - aircraft cannon kurchevsky) rifles were mounted under the wings outside the propeller arc and the rear fuselage and tail assembly were of reinforced metal construction to withstand the blast. a single small-caliber synchronized machine gun in the left fuselage was added to aid the pilot in aiming.