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The Naval Aircraft Factory N3N is an American tandem-seat, open cockpit, primary training biplane aircraft built by the Naval Aircraft Factory (NAF) in Philadelphia, Pennsylvania, during the 1930s and early 1940s. Built to replace the Consolidated NY-2 and NY-3, the N3N was successfully tested as both a conventional airplane and a seaplane. The seaplane used a single large float under the fuselage and two smaller floats under the outer tips of the lower wings. The conventional airplane used a fixed landing gear. The prototype XN3N-1 was powered by a Wright J-5 radial engine. An order for 179 production aircraft was received. Near the end of the first production run the engine was replaced with the Wright R-760-2 Whirlwind radial. The aircraft is constructed using Alcoa's extruded aluminum, with bolts and rivets, rather than the more common welded steel tubing fuselages. Early production models used aluminum stringers formed for cancelled airship construction orders. The N.A.F. built 997 N3N aircraft beginning in 1935. They included 179 N3N-1s and 816 N3N-3s, plus their prototypes. Production ended in 1942, but the type remained in use through the rest of World War II. The N3N was the last biplane in US military service - the last (used by the U.S. Naval Academy for aviation familiarization) were retired in 1959. The N3N was also unique in that it was an aircraft designed and manufactured by an aviation firm wholly owned and operated by the U.S. government (the Navy, in this case) as opposed to private industry. For this purpose, the U.S. Navy bought the rights and the tooling for the Wright R-760 series engine and produced their own engines. These Navy-built engines were installed on Navy-built airframes. According to Trimble, "The N3N-3, sometimes known as the Yellow Bird for its distinctive, high-visibility paint scheme, or less kindly, Yellow Peril for the jeopardy in which student aviators often found themselves, showed itself to be rugged, reliable, and generally forgiving to student pilots." Four N3N-3s were delivered to the United States Coast Guard in 1941. Postwar, many surviving aircraft were sold on the US civil aircraft market and bought for operation by agricultural aerial spraying firms and private pilot owners. According to Robinet, "The front cockpit had been replaced with a huge metal hopper that loaded from the top and discharged dust from the bottom through a simple venturi type spreader. The airplane was originally powered by a 235 h.p. Wright Radial engine but for their purposes, these were replaced by 450 h.p. Pratt & Whitney radial engines. The engine, wheels and instruments were obtained from the Army BT-13 which was purchased for less that $350.00 each." A number are still (as of 2014) active in the USA. Vartants XN3N-1 First prototype aircraft, Bureau of Aeronautics number 9991. N3N-1 Two-seat primary trainer biplane, powered by a 220 hp (160 kW) Wright R-790 Whirlwind (J-5) radial piston engine. 179 were built. XN3N-2 One prototype only (Bureau number 0265) powered by a 240 hp (180 kW) Wright R-760-96 Whirlwind (J-6-7) radial piston engine. XN3N-3 One production N3N-1 (0020) converted into a 'dash three' prototype. N3N-3 Two-seat primary trainer biplane, powered by a 235 hp (175 kW) Wright R-760-2 Whirlwind (J-6-7) radial piston engine. 816 built.

The Airbus Helicopters H145 (formerly Eurocopter EC145) is a twin-engine light utility helicopter developed and manufactured by Airbus Helicopters. Originally designated as the BK 117, the H145 is based upon the MBB/Kawasaki BK 117 C1, which became a part of the combined Eurocopter line-up in 1992 with the merger of Messerschmitt-Bölkow-Blohm's helicopter division of Daimler-Benz into Eurocopter. The helicopter was initially named EC145; an updated version, EC145 T2, was renamed H145 in 2015. The helicopter was significantly updated in the 2020s with first a fenestron replacing the traditional tail rotor, followed later by a 5-blade main rotor head. The H145 is a twin-engine aircraft and can carry up to nine passengers along with two crew, depending on customer configuration. The helicopter is marketed for passenger transport, corporate transport, emergency medical services (EMS), search and rescue, parapublic and utility roles. Military variants of the helicopter have also been produced under various designations, such as H145M or UH-72, and have been used for training, logistics, medical evacuation, reconnaissance, light attack, and troop-transport operations. Noted military users in terms of numbers include the United States which operates nearly 500 with National Guard, and Germany where it is used for SAR, Special Operations, and more. Over 1600 of the H145 family had been produced by June 2023. The EC145 features a larger cabin space than the older BK 117 C1 helicopter with internal space increased by 46 cm (18 in) in length and 13 cm (5 in) in width, increasing cabin volume by 1.0 m3 (35 cu ft) to 6.0 m3 (210 cu ft). Other improvements over the BK 117 include an increased maximum take-off weight and greater range, achieved partially by the adoption of composite rotor blades, which were derived from the smaller EC135. The EC145 has a hingeless rotor system with a monolithic titanium hub; the helicopter was originally powered by a pair of Turboméca Arriel 1E2 turboshaft engines, later aircraft are powered by the upgraded Turboméca Arriel 2E engine. A key feature of the rotorcraft is the variable rotorspeed and torque matching system (VARTOMS), derived from the BK 117, which Eurocopter has attributed as making the EC145 "the quietest helicopter in its class". For more details of development, design, operational history and 13 variants, click here.

The Hungaro Copter is a Hungarian helicopter produced by Hungaro Copter Limited of Verpelét, an affiliate of the Steel Riders Limited company. The lead engineer for the design was Farkas Gábor. The aircraft is supplied as a kit for amateur construction. The aircraft was designed to comply with the European microlight aircraft rules. It features a single main rotor and tail rotor, a single-seat enclosed cockpit with a fairing, or an open cockpit without a windshield, skid landing gear and a four-cylinder, four stroke 135 hp (101 kW) Subaru EJ22 or 160 hp (119 kW) Subaru EJ25 automotive conversion engine. The six-cylinder 125 hp (93 kW) D-Motor LF39 powerplant has also been used. The aircraft fuselage is made from welded steel tubing. Its two-bladed rotor has a diameter of 7.0 m (23.0 ft). The aircraft has a typical empty weight of 300 kg (661 lb) and a gross weight of 430 kg (948 lb), giving a useful load of 130 kg (287 lb). The construction time from the supplied kit is estimated as 300 hours.