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The Robinson R44 is a four-seat light helicopter produced by Robinson Helicopter Company since 1992. Derived from the company's two-seat Robinson R22, the R44 features hydraulically assisted flight controls and a larger engine.
The first prototype of the BŻ-4 Żuk four-seat helicopter was manufactured and displayed publicly in the Polish Aviation Day Exhibition in August 1956. Due to a long program of ground testing and fixing faults, it flew first only on 10 February 1959 and completed 17 flights for a total of 3 hrs, 40 minutes.
Bell announced its new project after the Bell 429 and Bell V-22, the super medium Bell 525, previously it was known as Project X or Magellan. The Helicopter is overall designed for trips of 50 to 500 nautical miles, and has a 5-blade main rotor powered by twin engines, digital controls and Garmin G5000H screen, with planned seating for 16-20 people. [3]
The Bell 407 is a four-blade, single-engine, civil utility helicopter. A derivative of the Bell 206L-4 LongRanger, the 407 uses the four-blade, soft-in-plane design rotor with composite hub developed for the United States Army's OH-58D Kiowa Warrior instead of the two-blade, semi-rigid, teetering rotor of the 206L-4.
The Mosquito Aviation XE is a single seat homebuilt helicopter. By 2015 Mosquito Aviation was out of business and the design was being produced by Innovator Technologies of Rockyview, Alberta, Canada. [1] By 2019 the design was being produced by Composite FX of Trenton, Florida. [2]
The S-52 was the first helicopter to be flown in a loop, as flown by Harold E. Thompson on 19 May 1949. [5] The two-seat version was modified into the S-52-2, a four-seat helicopter using a 245 hp (183 kW) Franklin O-425-1 air-cooled flat-six, which was moved slightly to the rear to accommodate the enlarged cabin. [4]
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The Kawasaki KH-4 was a light utility helicopter produced in Japan in the 1960s as a development of the Bell 47 that Kawasaki had been building under licence since 1952. The most visible difference between the KH-4 and its forerunner was its new and enlarged cabin .