| 词条 | Chyetverikov ARK-3 | |||||||||||||||
| 释义 |
The Chyetverikov ARK-3 (ARKtichyeskii - arctic) was a multi-role flying boat designed for Arctic operations that was built in the Soviet Union from {{avyear|1933}}. It featured a conventional flying boat hull, with high cantilever wings equipped with floats at mid-span. The two piston engines were mounted in tractor-pusher fashion on a pylon above the fuselage. DevelopmentIn 1933 Chyetverikov had the design for a compact twin engined flying-boat ready for further development, which he proposed to the Glavsyevmorput (Glavsyevmorput – chief administration of northern sea routes) as a multi-role Arctic aircraft, and an order for a prototype was made, setting up Chyetverikov in his own OKB (design bureau). The ARK-3 was of mixed construction, with a {{convert|14|m|adj=on|1}} long Duralumin stressed skin fuselage; wooden wings of MOS-27 aerofoil section; duralumin tubing tail surfaces; and ailerons with fabric covering. The dual control enclosed cockpit housed two pilots sided by side with two gunners/observers in bow and dorsal positions. Strut-supported wooden floats, at approximately half-span; and a pylon-supported engine nacelle housing tandem radial engines with Townend ring cowlings; completed the structural elements, built with a safety factor of 5.5.{{clarify|reason=What is meant by "safety factor of 5.5"?|date=March 2019}} Flight- and sea trials in 1936 revealed weaknesses in the bows, floats and engine nacelle pylon, which were all strengthened. Performance was deemed to be good, prompting an order for a second prototype with the fuselage lengthened by {{convert|60|cm|0}} to {{convert|14.6|m|1}} and a slightly enlarged wing; this was designated ARK-3-2 and the first prototype was re-designated ARK-3-1. A production order for five aircraft was placed, with production commencing immediately. On 14 July {{avyear|1937}} the ARK-3-1 was destroyed following a structural failure; the ARK-3-2 was destroyed exactly one year later and the programme was cancelled. Variants
Specifications (ARK-3-2){{aerospecs|ref= Gunston, Bill. The Osprey Encyclopaedia of Russian Aircraft 1875 – 1995. London, Osprey. 1995. {{ISBN|1-85532-405-9}} |met or eng?=met |crew= 4 |capacity= 10 pax |length m= 14.6 |length ft= 47 |length in= 11 |span m= 20 |span ft= 65 |span in= 7-1/4 |swept m= |swept ft= |swept in= |rot number= |rot dia m= |rot dia ft= |rot dia in= |dia m= |dia ft= |dia in= |width m= |width ft= |width in= |height m= |height ft= |height in= |wing area sqm= 59.5 |wing area sqft= 640 |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio= |wing profile= |empty weight kg= 3,642 |empty weight lb= 8,029 |gross weight kg= 5,600 |gross weight lb= 12,346 |lift kg= |lift lb= |eng1 number= 2 |eng1 type= Shvetsov M-25A |eng1 kw= 544.36 |eng1 hp= 730 |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= 320 |max speed mph= 199 |max speed mach= |cruise speed kmh= |cruise speed mph= |stall speed kmh= |stall speed mph= |range km=1,500 |range miles=932 |endurance h= |endurance min= |ceiling m=8,500 |ceiling ft=27,890 |g limits= |roll rate= |glide ratio= |climb rate ms= 4.76 |climb rate ftmin= 937.4 |sink rate ms= |sink rate ftmin= |armament1= 1 x machine gun in a manually operated bow turret. |armament2= 1 x machine-gun in a dorsal sliding hatch |armament3= |armament4= |armament5= |armament6= }} References{{commons category|Chyetverikov}}{{refbegin}}
6 : Soviet patrol aircraft 1930–1939|Flying boats|Chyetverikov aircraft|Twin-engined push-pull aircraft|High-wing aircraft|Aircraft first flown in 1936 |
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