| 词条 | McCulloch MC-4 | |||||||||||||||
| 释义 |
The McCulloch Model MC-4 was an American tandem-rotor helicopter and was the first helicopter developed by McCulloch Aircraft Corporation, a division of McCulloch Motors Corporation.[1] It was evaluated by the United States Army as the YH-30 and the United States Navy as the XHUM-1. Design and developmentThe MC-4 was a larger version of the earlier Jovanovich JOV-3 tandem-rotor helicopter and was developed by the McCulloch Aircraft Corporation. The JOV-3 was developed by Jovanovich when he headed the Helicopter Engineering and Research Corporation. The JOV-3 first flew in 1948. In 1949 Jovanovich moved to the McCulloch Motors Corporation where an enlarged helicopter the MC-4 first flew in March 1951. It was followed by a similar MC-4C and three evaluation helicopters for the United States Army (as the YH-30). The MC-4C was slightly larger than the MC-4. When the MC-4C was certified in 1953 it was the first tandem-rotor helicopter to be certified in the United States for commercial use. Three examples were evaluated by the United States Army as the YH-30, but the Army's evaluation showed the helicopter to be underpowered.[1] The YH-30 had a steel tube framework with a light metal skin, A single 200 hp Franklin piston engine was horizontally mounted amidships and powered two intermeshing tandem rotors. It had a fixed-wheel tricycle landing gear with a castering nosewheel. No civil or military orders were received and Jovanovich formed his own company, the Jovair Corporation, where he modified the MC-4C as a prototype for a four-seat private helicopter designated the Sedan 4E. The Sedan 4E was powered by 210 hp Franklin 6A-335 engine. A version with a turbocharged engine was designed as the Sedan 4ES and a more basic Sedan 4A for agricultural use. By 1965 a small number of Sedan helicopters were built. In the early 1970s McCulloch regained the rights to the helicopter designs. Variants
Prototype with a 165 hp Franklin engine, two built, one for evaluation by the United States Navy.
Variant for evaluation by the United States Navy as the XHUM-1, two built.
Prototype with a 200 hp Franklin engine, one built and an additional three for United States Army evaluation as the YH-30.
Production civil four-seat version powered by a 210 hp Franklin 6A-335 engine.
Sedan with a turbocharged 225 hp Franklin engine.
Simplified agricultural version. Military designations
Military version of the MC-4C, three built.
Two MC-4As for evaluation by the United States Navy, later redesignated HUM-1. Operators
SurvivorsIn 2008 two MC-4Cs were registered in the United States. The Pima Air and Space Museum has a HUM-1, registration N4072K. The Yanks American Air Museum at Chino is restoring a MC-4C to flying condition although there are no plans to fly it. It may be N4071K or N4091K. One of the three YH-30 military prototypes is preserved by the US Army Aviation Museum at Fort Rucker, Alabama. It is c/n 001 and has the military serial 52-5837. As of April 2013 it remains in a storage building and is not on public display. In December 2018, the Army's aircraft had completed much of its restoration and in January 2019, is on display at the Army Aviation Museum at Fort Rucker, Alabama. MediaAn MC-4C was used in the 1954 science fiction production Gog. Specifications (YH-30){{aerospecs|ref= |met or eng?=eng |crew=two |capacity= |length m= |length ft=32 |length in=0 |span m= |span ft= |span in= |swept m= |swept ft= |swept in= |rot number=2 |rot dia m= |rot dia ft=22 |rot dia in=0 |dia m= |dia ft= |dia in= |width m= |width ft= |width in= |height m= |height ft=9 |height in=2 |wing area sqm= |wing area sqft= |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio= |empty weight kg=544 |empty weight lb=1200 |gross weight kg=907 |gross weight lb=2000 |lift kg= |lift lb= |eng1 number=1 |eng1 type=Franklin O-335-6 (6A4-200-C6) piston |eng1 kw=147.1 |eng1 hp=200 |eng1 kn= |eng1 lbf= |eng1 kn-ab= |eng1 lbf-ab= |eng2 number= |eng2 type= |eng2 kw= |eng2 hp= |eng2 kn= |eng2 lbf= |eng2 kn-ab= |eng2 lbf-ab= |max speed kmh=168.98 |max speed mph=105 |max speed mach= |cruise speed kmh= |cruise speed mph= |range km=321.86 |range miles=200 |endurance h= |endurance min= |ceiling m= |ceiling ft= |glide ratio= |climb rate ms= |climb rate ftmin= |sink rate ms= |sink rate ftmin= |armament1= |armament2= |armament3= |armament4= |armament5= |armament6= }} References1. ^1 Harding, Stephen U.S. Army Aircraft Since 1947, Airlife Publishing, Ltd. 1990. {{ISBN|1-85310-102-8}}
External links{{commons category|McCulloch MC-4}}
4 : United States experimental aircraft 1950–1959|Tandem rotor helicopters|United States helicopters 1950–1959|Aircraft first flown in 1948 |
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