The Aer Lualdi L.55 was a prototype Italian helicopter, a development of the Lualdi-Tassotti ES 53 featuring a far more powerful 134 kW (180 hp) Lycoming O-360. While the ES 53 had been purely experimental, the L.55 was Lualdi's first step towards a marketable aircraft.
The Aer Lualdi L.59 was an Italian helicopter that failed to reach quantity production.
The Adams-Wilson Hobbycopter is a small, single-seat, open-framework helicopter designed for homebuilding, to be powered by a motorcycle engine.
The Kamov Ka-10 was a Soviet single-seat observation helicopter that first flew in 1949.
The Hiller YH-32 Hornet was an American ultralight helicopter built by Hiller Aircraft in the early 1950s. It was a small and unique design because it was powered by two Hiller 8RJ2B ramjet engines mounted on the rotor blade tips which weigh 13 lb (5.9 kg) each and deliver an equivalent of 45 hp (34 kW) for a total of 90 hp (67 kW). Versions of the HJ-1 Hornet were built for the United States Army and the United States Navy in the early 1950s.
The Agusta A.103 was an Italian prototype single-seat light helicopter flown in October 1959. The pilot was enclosed by a perspex bubble with the engine at the rear and the tail rotor carried on an enclosed boom.
The Bell R-12 was an American 1940s military utility helicopter built by the Bell Helicopter company.
The Bréguet-Richet Gyroplane was an early French experimental quadcopter rotary-wing aircraft developed by Bréguet Aviation.
The Manzolini Libellula was a 1950s Italian co-axial twin-rotor helicopter designed by Ettore Manzolini. "Libellula" is the Italian word for "Dragonfly".
The Cierva CR Twin was a five-seat utility helicopter that first flew in the UK in 1969. It was a joint development between Cierva Autogiro Company and Rotorcraft now a subsidiary of Cierva, based on the dynamic systems of the latter company's Grasshopper design. A new, highly streamlined pod-and-boom fuselage was married to the Grasshopper's coaxial rotor system, and the new aircraft registered G-AWRP first flew on 18 August 1969.
The AVIA FL.3 was an Italian two-seat cabin monoplane designed and built by Azionaria Vercellese Industrie Aeronautiche (AVIA) who were later taken over by Lombardi in 1947.
The Gyrodyne RON Rotorcycle was a tiny, single-seat helicopter designed under contract for the United States Navy. in the mid-1950s. It later was redesigned for a U.S. Marine Corps requirement for a small personal helicopter that would fulfill a number of roles, including observation, liaison, small unit tactical maneuvers, and which could be dropped to downed airmen behind enemy lines to facilitate their escape.
The Silvercraft SH-4 is an Italian three-seater light helicopter designed and built by Silvercraft SpA.
The Hiller ROE Rotorcycle was a single seat ultralight helicopter designed in 1953 for a military requirement. A total of 12 were produced for the United States Marine Corps. And in 1954, the Hiller Helicopters was selected by the US Navy's Bureau of Aeronautics to build this design of a one-man, foldable, self-rescue and observation helicopter. It featured a two blade rotor system. Its original empty weight was 290 lb (132 kg).
The I.P.D BF-1 Beija-Flôr was a two-seat light helicopter designed by Henrich Focke.
The Baumgärtl PB-63 was a 1950s single-seat helicopter designed and built by the Austrian-designer Paul Baumgärtl for the Brazilian Air Ministry. The PB-63 was of a conventional pod and boom design with an open steel-tube construction and it had a single main rotor and a tail-mounted anti-torque rotor. It had a tricycle landing gear with the pilot in an open sided cabin at the front. The PB-63 was powered by an 85 hp (63 kW) Continental C85-12 flat-four piston engine.
The Staib Helicopter is a homebuilt aircraft design of Wilbur Staib.
The Mosquito Aviation XE is a single seat homebuilt helicopter.
The Helicom H-1 Commuter Jr is a single or two place homebuilt helicopter.
The Innovator Mosquito Air is a Canadian helicopter produced by Innovator Technologies of Rockyview, Alberta. The aircraft is supplied as a kit for amateur construction.
