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| The B-58 project began in 1949 when the US Air Force issued a request for a supersonic bomber. After the Consolidated-Vultee (later Convair) submission was selected over a competing Boeing proposal, Convair proceeded with a major development effort to make the major advances in aerodynamics, structural design, and materials needed to meet performance requirements. |
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The resulting design featured a delta wing mated to a slender fuselage incorporating the area-rule concept to reduce transonic drag. One of the aircraft's most novel features was a large centerline pod mounted beneath the fuselage carrying fuel as well as a nuclear bomb. |
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The idea underlying this concept was that the entire pod would be dropped over the target giving the B-58 a cleaner, more aerodynamic shape thereby allowing the aircraft to escape at higher speeds. Other advances in the design included separate tandem cockpits for the three crew, each featuring a jettisonable escape capsule, and a radar-guided cannon in the tail. Following the first flight of the XB-58 prototype, the aircraft soon began setting a number of speed records, including the first bomber to exceed Mach 1, 1,000-km and 2,000-km closed-circuit speed records, and the first aircraft to exceed 2,000 km/h (1,245 mph) for 30 minutes thereby capturing the Bleriot trophy. A total of 116 B-58s were constructed between 1956 and 1962, and the last was withdrawn from service on 31 January 1970. |
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Although Convair proposed improved B-58B and B-58C models seen as cheaper alternatives to the XB-70 Valkyrie bomber, the B-58 served for only one decade before being replaced by the F-111. HISTORY: First Flight 11 November 1956 Service Entry 15 March 1960 CREW: 3 DIMENSIONS: Length 96.75 ft (29.49 m) Wingspan 56.83 ft (17.32 m) Height 31.42 ft (9.58 m) Wing Area 1,542 ft2 (143.25 m2) WEIGHTS: Empty 55,560 lb (25,200 kg) Max Takeoff 163,000 lb (73,935 kg). |
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PROPULSION: Powerplant four General Electric J-79 afterburning turbojets Thrust 42,000 lb (186.83 kN) 64,000 lb (284.70 kN) with afterburner. PERFORMANCE: Max Level Speed at altitude: 1,385 mph (2,230 km/h) at 40,000 ft (12,190 m), Mach 2.1 Service Ceiling 60,000 ft (18,290 m) Range 1,735 nm (3,220 km) 4,845 nm (8,975 km) with in-flight refueling. ARMAMENT: Gun one 20-mm T-171E3 Vulcan rotary cannon in a radar-aimed tail barbette Stations one external hardpoint for a disposable centerline pod Air-to-Air Missile none Air-to-Surface Missile none Bomb various nuclear bombs |
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KNOWN VARIANTS: XB-58 Prototype; 2 built YB-58A Pre-production trials aircraft; 28 built B-58A Production model; 86 built plus 10 converted from YB-58A airframes NB-58A Converted airframe used to test the J-93 turbojet engine being developed for the XB-70 bomber, the J-93 being carried in a nacelle beneath the fuselage; 1 converted RB-58A Reconnaissance model re-built from YB-58A airframes; 17 converted TB-58A Pilot trainer model modified from XB-58 and YB-58A airframes, featured a raised seat in the second cockpit for instructor visibility; 8 converted B-58B Proposed improved model; not built B-58C Proposed improved model; not built. |
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B-58 Hustler The general operating requirement, SAB-51, called for the replacement of the B-47 to be the first supersonic bomber. Research and development studies began in the late 1940's, and both Boeing and Convair developed conceptual designs. In 1952, the more revolutionary Convair design was chosen and designated the B-58, with the first flight occurring November 11, 1956.59 The program was not a competitive development, and Convair was given total development responsibility. As a result of money and schedule problems, the number of aircraft produced was reduced from 244 to 116, with its initial deployment in 1960. The B-58 represented a drastic change from the B-47 in design, acquisition strategy, and deployment philosophy with SAB-51 being the first time that Air Force requirements called for radical, technological advances. |
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The design specifications called for a Mach 2, high-altitude, medium-range nuclear bomber of minimum size to keep a low RCS. Convair was the prime contractor under the "Weapon System Management Concept" introduced with the B-58 and had responsibility for all subcontractor performance. This was in marked contrast to prior programs in which the Air Force was responsible for providing the prime contractor with "off-the-shelf" technology subsystems. The deployment concept was also different from the B-47 since the B-58 was designed to rely on quality rather than quantity. These radical changes in the Air Force's approach to bomber development resulted in many problems. For example, meeting the technological requirements proved difficult and resulted in schedule slippages and cost overruns, while under-funding and lack of space on board affected development options. Subsequently, the B-58 was considered an interim bomber since the XB-70 was on the drawing boards.The B-58 had a delta wing design that included many firsts for strategic bombers. It had four turbojet engines with afterburners, and was the first supersonic aircraft with engine pods mounted outboard on the wings. |
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The wings had a span of 56 feet, 10 inches and were swept 60; the length was 96 feet, 9 inches; the height at the tail was 29 feet, 11 inches; and the maximum takeoff gross weight was 160,000 pounds. The crew consisted of a pilot, navigator, and defensive systems operator seated in tandem. While a retrofit provided each crew member an individual ejection capsule for supersonic bailout, the cramped crew cockpit made long missions like airborne alert very exhausting for the crew. The high altitude range of 3,500 nm for the B-58A and 4,000 nm for the B-58B included the use of a large centerline fuel pod. Although this range was better than the B-47, the lack of forward basing resulted in a requirement for more tanker support. While the B-58 was faster than Soviet fighters, the newly emerging threat was the development of SAMs in the late 1950's that forced the B-58 to adapt to low level penetration of enemy defenses. This change in mission profile caused a large increase in fuel consumption and compounded range problem. |
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The B-58 did not have a bomb bay but could carry one nuclear weapon externally with the centerline fuel pod fitting over it. Four weapons, whether nuclear or conventional, could be carried on external hard points if the fuel pod was eliminated, thus degrading the aircraft's range further. With fewer aircraft deployed, a larger payload was needed to deliver as many weapons as its predecessor, the B-47. But the amount of space available for modifications was less than that for the B-47. In an era of improving SAM technology, ECM modifications have been continually needed to meet the evolving threat, and space was not available for additional ECM.
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The B-58, although the holder of numerous world speed records, was severely restricted in its usefulness and lifetime. Designed for supersonic, high-altitude penetration, the B-58 was limited in range, payload, and growth potential for the addition of advanced radar and other electronic equipment.
Thus, replacements were the main mode of modification. For example, analog electronic equipment with cooling problems was replaced by digital electronics. The B-58's planned production run was reduced because of the high cost per unit, a small payload, a mission profile different from its design concept, and, in the 1960's, a Secretary of Defense that downplayed the role of the bomber. In addition, it was very expensive to operate, and huge sums of money were needed for the Vietnam war. |
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The first B-58 was delivered in August 1960 and by 1964 deployment had reached about 90 aircraft. The B-58 had a Mach 2 dash capability and employed an external weapons pod. The last B-58 was retired in January 1970, about three months after the first FB-111 was accepted by SAC. Although the aircrews swore by the B-58, money and mission limitations led to it being phased out of the inventory after only 10 years of service. Link |
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Convair B-58 Hustler FDE |
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DRAWINGS “CONVAIR B-58 HUSTLER” LE GRAND ATLAS DE L’AVIATION EDITIONS ATLAS |
