* The Soviet Union had a certain admiration for the virtue of sheer impressive size, and this bias was reflected in aircraft design. The most spectacular examples are three of the largest aircraft ever built, all products of the Antonov design bureau: the "An-22 Antheus (Cock)", the "An-124 Ruslan (Condor)", and the "An-225 Mriya (Cossack)" cargolifters. This document provides a history and description of these Antonov giants.
* On 16 June 1965, the Soviet Union impressed Western observers by flying in the prototype of a new cargolifter aircraft, the Antonov "An-22 Antel (Antheus)", to the Paris Air Show. The new transport was indisputably the biggest aircraft in the world. The An-22 had performed its first flight only months before, on 27 February 1965. By 1967, the initial prototype that made its debut in Paris had been followed by four more prototypes and the first production item. The Soviets were proud of their impressive big machine, demonstrating it in public air displays in the USSR and announcing that it had set a number of payload-to-height records.
Observers recognized that the new machine was clearly a scaled up An-12 "Cub", both machines being four-engine turboprops with a high-mounted, straight, narrow-chord wing. Both aircraft also featured main landing gear mounted in fairings along the fuselage, with a pressurized crew compartment and unpressurized cargo compartment. There were also clear differences between the two beyond their difference in size. Unlike the An-12, the An-22 used four-bladed contrarotating propellers, driven by Kuznetsov NK-12MA turboprop engines providing 11.2 kW (15,000 SHP) each. The An-22 also featured twin tailfins, instead of the An-12's large single tailfin. The twin tailfins gave the An-22 better handling with an engine out, and a single tailfin would have had to have been much too tall anyway.
The narrow-chord wing of the An-22 meant that the total wing area was low and so the wing loading was unusually high for a cargolifter, but the wing had double slotted flaps over 60% of its length, and the An-22 could take off in 1,400 meters (4,265 feet) in fully-loaded condition. The An-22 was designed for rough-field operation, with two-wheel nosegear and three levered-suspension dual main landing gear assemblies in each fairing, for a total of six main gear assemblies and twelve main gear wheels. The aircrew could adjust tire pressure from the cockpit to compensate for field conditions.
There were five or six crew, plus a pressurized compartment behind the cockpit with seating for 28 or 29 passengers. Personnel access was through a door in both landing gear fairings. The main cargo bay was 33 meters (108 feet) long, and was accessed through a rear loading ramp. The ramp could be opened in flight for airdrop of cargoes. Cargo capacity was 80 tonnes (88 tons). There were four traveling gantries mounted on rails in the roof of the cargo bay, to be used in conjunction with two winches, each with a load capacity of 2,500 kilograms (5,500 pounds).
An array of three radars were fitted with radomes under the nose for navigation and weather warning, and like most Soviet transports, there was glazing under the nose for the navigator.
ANTONOV AN-22 ANTHEUS ("COCK"): _____________________ _________________ _______________________ spec metric english _____________________ _________________ _______________________ wingspan 64.40 meters 211 feet 3 inches wing area 345 sq_meters 3,714 sq_feet length 57.9 meters 190 feet height 12.53 meters 41 feet 1 inch empty weight 114,000 kilograms 251,325 pounds max takeoff weight 250,000 kilograms 551,155 pounds max speed at altitude 740 KPH 460 MPH / 400 KT service ceiling 7,500 meters 24,600 feet range, max payload 5,000 kilometers 3,100 MI / 2,700 NMI range, max fuel 10,950 kilometers 6,800 MI / 5,920 NMI _____________________ _________________ _______________________
Apparently about 100 An-22s were built to end of production in 1974, with the totals split evenly between Aeroflot and the VTA, the Soviet military airlift service, though some sources claim that even the Aeroflot machines were generally used for military duties. Some of the five prototypes were upgraded to production specification and put into formal service. The An-22s were used mostly to carry cargoes to the undeveloped Soviet Far East. The Antonov bureau considered building a double-decker airliner version of the An-22, with a capacity of 724 passengers, but this machine never got beyond design studies.
The An-22 was supplemented by the Antonov An-124, discussed below, beginning in 1987. It is unclear how many An-22s still remain in service; it appears many were mothballed for a time but then refurbished for service. One crashed during Russian military exercises in 2010, killing all 12 crew. Other An-22s were grounded until the problem was tracked down.BACK_TO_TOP
* In 1968, the US flew the first Lockheed "C-5A Galaxy" cargolifter, which took the title of "world's biggest aircraft" away from the An-22. The USSR was of course inclined to respond -- to the extent that need justified it and the resources were available -- and in the summer of 1977 reports indicated that the Soviets were in fact working on a mega-sized jet cargolifter.
The initial prototype of the new aircraft performed its first flight in December 1982. Although the NATO rumor mill had assigned the type the designation "An-40" and then "An-400", along with the NATO codename "Condor", in 1985 the big jet was announced as the "An-124 Ruslan". The aircraft entered service in early 1986.
The An-124 had a general configuration similar to that of the C-5A, with a high-set swept wing mounting four high-bypass turbofans on pylons, the aircraft featuring front and rear loading. The most significant visible difference from the C-5A was that the An-124 had a conventional low-set tailplane, in contrast to the tee tail of the C-5A. Although the dimensions of the two aircraft were similar, the An-124 had a greater empty weight than the C-5A and substantially greater cargo capacity.
The An-124 had very heavy-duty landing gear for rough field operation. The nose gear consisted of two twin-wheel units mounted in parallel, with each unit steered independently. There were five sets of main landing gear units on each side of the aircraft, with dual wheels on each set, for a total of ten sets and twenty wheels. The front two units on each side were steerable. The landing gear was adjustable to allow the transport to "kneel", to assist cargo loading.
The An-124's four Lotarev D-18T turbofans provided 230 kN (23,400 kgp / 51,590 lbf) thrust each, and had thrust reversers to reduce landing roll. In conjunction with full-span leading-edge slats and large flaps, the powerful engines allowed the An-124 to operate off of rough airstrips only 1,200 meters (3,800 feet) long.
ANTONOV AN-124 RUSLAN ("CONDOR"): _____________________ _________________ _______________________ spec metric english _____________________ _________________ _______________________ wingspan 73.3 meters 240 feet 6 inches wing area 628 sq_meters 6,760 sq_feet length 69.1 meters 226 feet 8 inches height 20.78 meters 68 feet 2 inches empty weight 175,000 kilograms 385,800 pounds loaded weight 405,000 kilograms 832,875 pounds max speed at altitude 865 KPH 535 MPH / 465 KT cruising altitude 10,000 meters 33,000 feet range, max payload 4,500 kilometers 2,795 MI / 2,430 NMI range, max fuel 16,500 kilometers 10,250 MI / 8,920 NMI _____________________ _________________ _______________________
The pressurized cabin accommodated a flight crew of six, along with accommodations for a relief crew. The aircraft was flown with a quadruplex fly-by-wire flight control system, and featured a triple-redundant inertial navigation system. It did not have a glazed nose. A pressurized passenger section with 88 seats was included behind the wing.
The transport's nose lifted up to allow a fold-out loading ramp to be deployed, while the tail featured a four-section door-ramp system. The cargo hold was 26 meters (118 feet) long, 6.4 meters (21 feet) wide, and 4.4 meters (14 feet 5 inches) high. Two traveling gantries were fitted to the roof, with each gantry having a load capacity of 10,000 kilograms (22,050 pounds) and fitted with two hoists, each having a load capacity of 5,000 kilograms (11,025 pounds). Twin auxiliary power units (APUs) could be used to drive the hoist system on the ground. The aircraft could carry a load of up to 150 tonnes (165 tons).
* A total of 46 Condors was built up to 1999, with 21 put into military service and 27 into civilian service. The An-124 has been a moneymaker for the Russians, since it has an unequaled cargolift capacity, and it is now carrying cargoes all over the world. In fact, business has been so good for the Condor that in mid-2000, Aviastar Aircraft began delivery of new-build "An-124-100" aircraft to the Russian cargo carrier Volga-Dnepr. These were the first new-built An-124s to be shipped since 1995, when two specialized An-124-100s were delivered to the Russian government for support of state visits. These two aircraft were later sold to the Ukraine's Antonov Airlines.
The new An-124-100s featured a much improved service life of 24,000 hours. The original An-124s were only built for a rated service life of 7,500 hours, apparently on the rationale that such a specialized aircraft would be used intermittently. The short service life led to a protracted dispute between the Antonov organization and commercial users of the An-124. The new aircraft resolved the dispute, and a service-life extension program was put in place for older An-124s.
The service-life extension program included airframe improvements, in particular for the cargo hold floor and cargo handling system; new avionics; a new crew rest compartment; and improved engines. The aircraft's four ZMKB Progress (previously Lotarev) D-18T turbofans, while retaining the same thrust, were uprated for a service life of 24,000 hours, still not first-class but a vast improvement over the original, pathetic service life of 1,250 hours. The new versions of the D-18T also met international noise and nitrous-oxide emission regulations. Other new kit in the An-124-100 included a Global Positioning System (GPS) satellite navigation receiver and a Honeywell ground proximity warning system.
The An-124 remains a product with a unique niche, and the Russian and Ukrainian organizations that build and fly the machine have lobbied their respective governments to authorize further new production. The new machines are to be built to the "An-124-500" specification, with payload raised from 120 to 150 tonnes (132 to 165 tons), a class cockpit, crew reduced from six to four, the latest D-18T turbofans, and further improved service life. The Russian government has been agreeable to the idea, and new An-124s may be delivered from 2015 or so.
* Volga-Dnepr is something of a Russian business success story. Their An-124-100s not only give the company an unmatched commercial heavy lift capability, these machines are optimized for operating under austere conditions and can fly almost anywhere if there's a landing strip long enough for them.
Possibly Volga-Dnepr's biggest single customer is the United Nations. The company has been a carrier for the UN since 1994, operating in peacekeeping operations over much of the world. The UN connection gets Volga-Dnepr additional business because nations working in specific peacekeeping operations often take advantage of the company's presence and charter them to fly other cargoes.
Volga-Dnepr was a major player in Afghanistan in 2001:2002, flying hundreds of cargoes for the UN, the World Food Program, the US military, and other organizations. Afghanistan was a particularly demanding scenario for the company. Not only were conditions very primitive, but the aircraft had to operate in "hot and high" conditions into airfields surrounded by jagged mountains, presenting a real challenge to pilots.BACK_TO_TOP
* Even as the An-124 was going into service, the Antonov bureau was working on a specialized derivative to carry outsize cargoes, usually externally. The primary loads were intended to be elements of the Soviet "Energia" heavy-lift space booster series, including the "Buran" manned space shuttle.
The result, the "An-225 Mriya (Dream)" performed its first flight in 1988, and appeared at the Paris Air Show in 1989 with a Buran shuttle on its back. The An-225 was clearly a derivative of the An-124, with fore and aft fuselage plugs to extend length, and wing inserts to extend span and allow mount of two more Lotarev D-18T turbofans, for a total of six engines.
The number of main landing gear assemblies was increased from five per side to seven to handle the increased takeoff weight. A set of standoffs were fitted to the back for external cargo carriage, with the standoffs covered by fairings when not in use, and the conventional tail assembly of the An-124 was changed to a twin-fin assembly to ensure controllability when a large cargo was mounted on the back. The rear loading ramp was deleted to reduce weight.
The An-225 can lift cargoes with a weight of up to 250 tonnes (275 tons). Since it was not intended for any tactical role, it was not designed for short-field operation, and has a takeoff length of 3,500 meters (11,500 feet) with maximum payload.
ANTONOV AN-225 MRIYA ("COSSACK"): _____________________ _________________ _______________________ spec metric english _____________________ _________________ _______________________ wingspan 88.4 meters 290 feet wing area 905 sq_meters 9,742 sq_feet length 84 meters 275 feet 7 inches height 18.2 meters 59 feet 9 inches empty weight 175,000 kilograms 385,800 pounds max takeoff weight 600,000 kilograms 1,322,275 pounds max speed at altitude 850 KPH 530 MPH / 460 KT cruising altitude 10,000 meters 33,000 feet range, max payload 4,500 kilometers 2,795 MI / 2,430 NMI range, max fuel 15,400 kilometers 9,570 MI / 8,310 NMI _____________________ _________________ _______________________
The An-225 is the world's biggest aircraft by far. Since it is a specialized machine, it is unlikely that there would have been reason to build it in large numbers in the best of circumstances. Given that the introduction of the big cargolifter coincided with the last days of the Soviet Union, it is not surprising that only two were built.
However, since the An-124 has proven profitable in the commercial heavy-lift market, the An-225 is now being offered for the same work. The Antonov bureau has refurbished one of the An-225s for commercial operations, including transport of bulky cargoes and possibly air launch of space boosters. The update program involved the addition of modern navigation and communication avionics, a collision avoidance system, and modifications to reduce the noise signature of the aircraft. First flight of the modified An-225 was on 7 May 2001.
Along with the modest improvements to the An-124 being considered for new production of the aircraft, the Antonov organization is also investigating a more ambitious cargolifter, an improved hybrid of the An-124 and An-225 called the "An-124-300". It would feature the fuselage of the An-124 and the extended wing of the An-225, kitted up with modern avionics and engines. Since more powerful engines are now available, only four would be needed instead of six. The cargo floor would be extended and a palletized loading system would be installed. It would have a maximum range of 11,500 kilometers (7,145 miles) with a 100 tonne (110 ton) cargo. Development costs were cited as less than a billion USD.BACK_TO_TOP
* Much to my surprise, I saw an An-124 in the late 1990s while I was flying to Florida at a Houston stopover. I saw this huge aircraft sitting alongside the runway and thought: "What the HELL is that monster?" As it turned out, apparently the Russians had a regular arrangement with some Texas oil companies and used the An-124 to transfer oil drilling gear to the various former-Soviet Central Asian republics. I had to admit the thing was impressive.
A few years later I got an email from a US Army sort who told me a story about how an An-124 flew into Wichita, Kansas, with some heavy industrial machinery from Switzerland for the Boeing plant there. All things considered, it was the cheapest way to deliver the machinery. On departure, the An-124 lost an engine and was grounded for four days while a spare engine was delivered and installed. My correspondent concluded: "The folks at the modifications hangars weren't sure whether to be impressed or horrified at this feat of repair."
I replied: "That almost might be a broad comment on Russian technology in general." He added that the Russians bitterly complained about the poor quality of American vodka, and that half a case of Russian vodka was provided as part of the repair kit. That made me imagine a conversation: "What's Kansas like, Dmitriy Mikhailovich?"
"Much like the Ukraine, Ivan Borisovich, but the vodka is lousy."
Just before Christmas 2005 I spotted an An-124 in what amounted to my own backyard, parked on the tarmac at Denver International Airport. Obviously the thing wasn't there to deliver holiday parcels; a search on the Web said that An-124s periodically flew into Denver to transport space-launch boosters to Cape Canaveral from the Lockheed Martin plant south of Denver. I believe these are Atlas boosters -- using Russian-designed main engines. Times have changed, though given recent sniping between the West and Russia, maybe not as much as might be wished.
* Sources include:
* Revision history:
v1.0.0 / 01 dec 02 / gvg v1.0.1 / 01 mar 03 / gvg / Typo corrections. v1.0.2 / 01 mar 05 / gvg / Review & polish. v1.0.3 / 01 jan 06 / gvg / Review & polish. v1.0.4 / 01 dec 07 / gvg / Review & polish. v1.0.5 / 01 nov 09 / gvg / Review & polish. v1.0.6 / 01 oct 11 / gvg / Review & polish.BACK_TO_TOP