Boeing B-52 Stratofortress

The History of the Boeing B-52 Stratofortress

The B-52 has been the preeminent American heavy bomber of the past 54 years. The massive aircraft served as a nuclear deterrent during the tough times of the Cold War, as a dedicated bomber and reconnaissance platform in the Vietnam War, and as a carpet-bombing nightmare for Iraqi forces during the 1991 Gulf War. The -52 saw combat action in the 2001 attack on Afghanistan (Operation Enduring Freedom) and the 2003 invasion of Iraq (Operation Iraqi Freedom).

The Stratofortress aircraft has evolved into a multi-role aircraft equally capable of target bombing, strategic bombing, anti-ship, nuclear warfare, minelaying, close support, reconnaissance, electronic warfare and maritime patrol operations. After being included in the U.S.

Air Force inventory, the B-52 became the first long-range swept-wing heavy bomber in the United States and currently retains its title as the longest-serving bomber in U.S. military history.

B-52 Origins

Boeing made a name for itself starting with the development of aircraft in the interwar period after the First World War. By World War II, the company was a household name thanks to its outstanding B-17 Flying Fortress and its successor design, the long-range heavy bomber B-29 Superfortress, which served in the Pacific and European theaters at high altitudes.

Altitude was responsible for dropping two atomic bombs on Japan. Commercial Stratocruisers appeared in the postwar years, as did the B-47 Stratojet military bomber, so it's no surprise that the name Stratofortress came to be chosen as Boeing's greatest achievement to date. one.

The origin of the B-52 comes from a specification issued by the visionary Air Materiel Command (AMC) on November 23, 1945. However, the AMC was attached to the U.S. Air Force branch at the end of World War II and originally entered service in 1917 as part of the U.S. Army Signal Corps.

This new specification calls for a next-generation long-range, intercontinental, high-altitude strategic bomber to replace the Convair B-36 Peacemakers already in development. In February 1946, Boeing Aircraft Company, United Aircraft Company and Glen L. Martin joined the fray with their respective answers.

The Boeing team developed the Type 462 as a multi-engine straight-wing design powered by six Wright T35 Typhoon turboprop engines, each producing 5,500 horsepower. On June 5, 1946, the Type 462 gradually entered service, and the B-52 legacy was born under the name XB-52.

A full model contract was then awarded.

By this time, the USAAF (United States Army Air Force) had surpassed the quality of the Type 462 and was concerned that the aircraft was obsolete in its traditional design approach and would never achieve the original specification's intended goals - most importantly, range. As a result, the USAF terminated its contract with Boeing, and the Type 462 was dead.

Boeing Chief Engineer Ed Wells took the Type 462 and developed two smaller quad-turboprop concepts, each in the form of their own 464-16 and 464-17. Essentially, the 464-16 was a short-range bomber designed for a larger payload, while the 464-17 was a long-range bomber designed for a smaller payload. Although interest was focused on the design of the 464-17, no idea remained with USAAF as a replacement for the B-36. Several other concepts were also developed, but the Luftwaffe's interest waned.

Type 464-29 appeared with 20 degree swept wings and powered by 4 x Pratt & Whitney turboprop engines. Again, the concept failed to meet key points of the specification, which is now constantly changing to include increased performance specifications and long distances.

The

464-35 model is another proposal from the Boeing design team with 4 x turboprops and contra-rotating propellers. The wing sweep added more than previous attempts and started to define the appearance of the stratobastion.

With aerial refueling becoming the norm for the Air Force, the design team now has some leeway in the overall size of the aircraft. Events in Europe in the second half of the 1940s spurred the XB-52 program and secured Boeing a hard-earned contract for a single model and at least two airworthy prototypes.

The Boeing design team's visit to Wright-Patterson Air Force Base shows that the Air Force is now more interested in jet-powered solutions as the only way to achieve the XB-52's required performance specifications. Over a weekend in a Dayton hotel room, the Ed Wells Company set out to research new ideas for a Monday morning presentation. The resulting design combined elements of their 464-35 model with the four-engine jet medium bomber concept they brought with them.

The new aircraft became an 8-engine Pratt & Whitney JT3 jet heavy bomber with 35-degree swept wings. A small balsa wood model was built to develop this idea further, with a detailed design document of model 464-49 of about 33 pages.

The weekend effort paid off for Boeing, as the Air Force showed strong interest in the plane after Monday morning. Designs were revised until the Type 464-67 accepted the new aircraft as two prototypes built.

Despite these advances, the USAF is still looking for replacements for its next-generation bomber designs, including modifications to the B-36 (as the YB-60) and B-47 (as the B-47Z), which are still developments.

Thanks to U.S. Air Force SAC (Strategic Air Command) Commander General Curtis LeMay's vision to bring the XB-52 program to life, the XB-52 production contract finally fell into the arms of Boeing executives on February 14 , 1951. The contract called for 13 B-52A models.

However, the USAF is still working towards the main objectives of the XB-52 program and now requires a reconnaissance aircraft in RB-52 form, although General LeMay and the SAC still see value in a bomber/reconnaissance hybrid. Despite the existence of Disagreement, the XB-52 team moved on. The XB-52 was the first prototype, followed by the YB-52.

The YB-52 received this rating because of funding provided by Air Force Logistics Command, which does not actually have the authority to fund experimental aircraft programs like this one.

The YB-52 beat the XB-52 in a flight test on March 15, 1952. For secrecy, the XB-52 rolled off the assembly line under cover at night on November 29, 1951, but a malfunction in the aerodynamic system caused enough damage to the trailing edges of the wings to allow the aircraft to roll back inboard for extended repairs. The YB-52 completed its maiden flight on April 15, 1952, without major setbacks.

The XB-52 finally took off on October 2, 1952. The cockpits of both the XB-52 and YB-52 are equipped with tandem seats and upward-facing ejection seats.

B-52 Tour

At the heart of the B-52's design is a distinctly elongated fuselage that is almost rectangular when viewed from the front. The wings are shoulder-mounted monoplanes mounted on the front of the fuselage and swept back at a 35-degree angle.

When the plane is stationary, the sag inherent to the enormous wingspan size forces both wings to tip toward the ends. This required the use of smaller landing gear (so-called cantilevers) outside the outermost engine block. The wings can bend up to 22 feet and down 10 feet. Each wing contains four engines in two engine pairs. Ultimately, in the event of an uncontrolled fire in the engines, the entire capsule would separate and fall, detaching from the plane's wings, effectively saving the plane -- an "unexpected benefit," as Boeing designers noted.

The flight deck will be behind and above the short nose, with window areas for forward, top and side views. The cockpit itself consists of two separate floors, with the pilot and co-pilot upstairs. The bomb bay occupies most of the lower part of the fuselage, followed by the Boeing B-47's landing gear - consisting of four independently retractable trucks with twin wheels in the lower forward and central fuselage positions - the bomb bay front and rear of the door. The trucks can also steer up to 20 degrees left or right to compensate for crosswinds.

The tail is controlled by a single large vertical tail and conventional horizontal surfaces.

The modern B-52 (B-52H model) employs an electro-optical forward-looking infrared (FLIR) sensor paired with a high-resolution, low-light TV for low- and high-light targeting and combat evaluation-level operations. Pilots can use night vision optics to enhance low-light flight operations, while the Global Positioning System (GPS) can provide visual travel assistance anywhere in the world. In-flight refueling and engine improvements have significantly and consistently improved Stratofortress range.

Improvements in crew comfort, overall crew safety, and the versatility to mount large internal and external loads all help make the B-52 relevant on today's battlefield.

Of course, due to its bomber origins, Stratofortress Armament is solely focused on the ability to use a variety of different types of conventional and nuclear munitions. For example, the H model has a bomb load of up to 70,000 pounds. Ammunition can range from conventionally thrown bombs, precision-guided bombs and mine delivery devices.

Stratofortress was eventually tested and accepted to fire more advanced munitions and guided weapons, including nuclear warhead types. The external mounts for these weapons will eventually become part of the B-52's armament. Today, the B-52 is certified to use more munitions types in U.S. inventory than any other U.S.

Air Force aircraft.

While the original B-52 was equipped with a 4 x 12.7mm Browning M3 heavy machine gun in the rear turret, later production models were changed to use a 1 x 20mm M61 remote-controlled cannon for self-defense. With the advent of the missile age, the rear armament was completely dismantled in the more modern stratobastion form. It should be noted, however, that during the Vietnam War, at least 2 Mikoyan-Gurevich MiG-21 "Fishbed" aircraft were destroyed by tail gunners, and these aircraft were killed by SSgt Samuel O. Turner and A1C Albert E. Moore - Both deaths in December 1972 were just days after the B-52D. In the case of the B-52D model, the tail gunner accesses the rear of the aircraft from the outside through an access hatch. Once inside, he was able to slide his feet into place first, then put on his headphones and helmet to settle in.

The originally folded seat backs can be raised for additional relative comfort. On the modified G model, the gunner is assigned to the main crew compartment (complete with an ejection seat mounted on the upper flight deck and facing the stern with the ECM operator) and operates the stern via the AGS-15 fire control system and radar Cannon.

Hyundai B-52H 8 x-Series Pratt & Whitney TF33-P-3/103 turbofans placed four in pairs per wing. These engines were a performance upgrade over the original turbojet type used in early Stratofortresses, although they had growing pains.

The Model H performance specs set a top speed of 650 mph, a combat radius of 4,480 miles, and a ferry range of 10,145 miles. The aircraft's service ceiling is limited to about 50,000 feet, while the climb rate can reach 6,270 feet per minute. The B-52H relies on a crew of five consisting of a pilot, co-pilot, navigator, electronic warfare officer, and radar navigator/bombardier.

Recon versions throughout the aircraft's history required up to 8 personnel.

B-52 variant

Despite its long history, fewer than a dozen variants of the B-52 were actually produced, starting with the limited-production developmental B-52A model mentioned above. Of the original order of 13 B-52As, 10 were later designated for production of the B-52B variant. Compared to the twin prototypes, the three B-52As now feature a more traditional side-by-side cockpit seating arrangement in a modified forward fuselage and rear armament with 4 x 12.7mm Browning M3 machine guns.

A distinguishing feature of the A and B models is the lack of a full-featured avionics suite. The aircraft are powered by Pratt & Whitney J57-9W engines, each producing 10,000 lbf of thrust. The split-level cockpit offers three seats on the upper deck and two seats on the lower deck. The lower passenger received a downward ejection seat.

The tail gunner was removed from the rest of the crew and sat in its rear-facing turret station without any ejection seats, although the tail system could be ejected in the event of an accident. A stress-free crawl space was his only connection to the front of the plane. Aerial refueling is carried out via boom linkages above and aft of the main flight deck. Other major additions are external fuel tanks mounted on the wings to increase range and reduce "wing flex" across the wingspan. The J57 was introduced with water injection to aid in the launch.

Both prototypes lacked the A-model's side-by-side cockpit seating arrangement and in-flight refueling arrangement, as well as a seat for the third crew member (Electronic Warfare Officer - EWO) on the upper deck. The NB-52A - also known as the "Supremacy" - was developed from the third B-52A test flight model.

This aircraft (S/N 52-0003) was modified to serve as the mothership for the launch of the experimental North American X-15 Hot Rod aircraft.