The Royal Air Factory SE.5 is a British mixed-wing fighter biplane with a classic tail from the First World War. It was created as a British response to the appearance of great Fokker and Albatros fighters on the Western Front in 1916. The flight of the prototype took place in November 1916, and the machine was delivered to the linear units in March 1917. The drive was a Hispano-Suiza engine with a capacity of 200 HP, which powered the first 60 serial aircraft, in the remaining examples the Waseley W4A Viper engine of the same power was used. The SE.5 was a successful fighter, with great performance, good weapons, easy handling and good resistance to enemy fire. Many Allied fighter aces flew on it, including: Billy Bishop, James McCudden and Albert Ball. Technical data: length: 6.38 m, wingspan: 8.11 m, height: 2.89 m, maximum speed: 222 km / h, practical ceiling: 5180 m, maximum range: 483 km, armament: fixed - 2 machine guns cal.7, 7mm.Albatros DV is a biplane of wooden structure with the front part of the fuselage, covered with aluminum sheet. The DV version did not differ much from its predecessor, the D.III series, mainly in terms of the fuselage section - the DV had an elliptical hull, which made it lighter by about 50 kg. The construction of the aileron drive was solved differently. These small changes seemed so small that the new aircraft was not even tested. The construction of the 1,5-wing aircraft, as in Nieuport, required a light aircraft. The inline albatrosses were too heavy for that. When recovering the aircraft from a dive flight, the lower lobe of the DV tended to break off frequently; this disadvantage was not eliminated by the end of the war. The D.Va version was stronger, but also heavier. About 900 Albatros DV series aircraft were built. Technical data: Maximum speed: 186 km / h; climb speed 4.2 m / s, ceiling practical 5700 m, armament: two 7.92 mm LMG08 / 15 machine guns.