Peter E. Davies – författare

A detailed study of one of the US's most famous post-war aircraft, the F-4 Phantom, which saw service in three branches of the US military during the Vietnam War.Although the F-4 Phantom II was the most important fighter-bomber to see action with all three American services during the Vietnam War, it was essentially a U.S. Navy design, and the carrier-borne squadron crews were its main operators in combat. The aircraft pioneered the use of long-range, radar-guided missiles in combat, although the majority of its Vietnam missions involved ground-attack with a variety of innovative ordnance. From 1968 to 1973 the Phantom II was the standard U.S. Navy fighter in Southeast Asia, having replaced several other types. Its performance and versatility enabled it to perform a variety of different missions, and switch roles as necessary, in the assault on some of the world’s most heavily defended territory.Including detailed colour profiles and first-person commentary from active participants in the F-4’s naval combat history, this is a detailed study of the U.S. armed services’ most famous post-war fighter.

A detailed study of how Operation Desert Storm saw Coalition forces respond to Iraq’s surface-to-air missile defences with ground-breaking combat aircraft technology.Developed in the wake of the USA’s ill-prepared entry into the Vietnam War, aircraft carrying electronic counter-measures equipment and anti-radar missiles were crucial to the success of Operation Desert Storm during the First Gulf War. Iraq’s air defence systems were elaborate and costly, but also well understood by Coalition planners, and its surface-to-air missile batteries struggled in the face of radar jamming, pyrotechnic deflection of infrared guidance and extraordinarily effective destruction of enemy air defences weapons like the AGM-88 High-speed Anti-Radiation Missile. Written by aviation expert Peter E Davies, this fascinating study uses newly commissioned artwork to enhance its retelling of how aircraft and weapons, as well as crew training and command-and-control structures, proved decisive in the outcome of Desert Storm in 1991. Archive photos capture examples of the principal weapons involved, while first-hand accounts from Coalition aircrew and planners convey the realities of a conflict in which cutting-edge technology played an inestimable role.

Conceived during 1941 in case Germany occupied Britain, when US bombers would then have insufficient range to retaliate, the B-36 was to be primarily a ‘10,000-mile bomber’ with heavy defensive armament, six engines and a performance that would prevent interception by fighters.Although rapid developments in jet engine and high-speed airframe technology quickly made it obsolescent, the B-36 took part in many important nuclear test programmes. The aircraft also provided the US nuclear deterrent until the faster B-52 became available in 1955. It was one of the first aircraft to use substantial amounts of magnesium in its structure, leading to the bomber’s ‘Magnesium Overcast’ nickname.It earned many superlatives due to the size and complexity of its structure, which used 27 miles of wiring, had a wingspan longer than the Wright brothers’ first flight, equivalent engine power to 400 cars, the same internal capacity as three five-room houses and 27,000 gallons of internal fuel – enough to propel a car around the world 18 times. Much was made of the fact that the wing was deep enough to allow engineers to enter it and maintain the engines in flight. B-36s continued in the bomber and reconnaissance role until their retirement in February 1959 following 11 years in SAC. Convair employees were invited to suggest names for the giant aircraft, eliciting suggestions such as ‘King Kong Bomber’, ‘Condor’, ‘Texan’ and ‘Unbelievable’, but the most popular was ‘Peacemaker’. Oddly, objections from religious groups deterred the USAF from ever adopting it officially.This fully illustrated volume includes first-hand accounts, original photographs and up to 30 profile artworks depicting in detail the complexity of this superlative aircraft.

A gripping account of the mighty F-4 Phantom II, icon of the Cold War and ultimate American fighter of the 1960s, versus the nimble, agile and abundant MiG-21, which was a communist icon of the period. Influential leaders and tacticians are profiled to provide a comparative evaluation of their contrasting skills. This book also reveals the technical specifications of each jet with an analysis of the weaponry, avionics and survival devices of the F-4 Phantom II as flown by the USAF and the MiG-21. The fighters'' strengths and weaknesses are also compared, including turn radius, performance at altitude, range and structural integrity.Featuring first-person extracts reflect on the dangers of these aerial duels, as USAF pilots and their counterparts struggled to overcome each plane''s shortcomings, this book draws us into the dangerous world braved by American and North Vietnamese airmen in the skies over Vietnam.

An in-depth technical study of the USN and export variants of the McDonnell–Douglas F-4 Phantom – sure to appeal to modelers, veterans, and aviation enthusiasts.Originally designed as a carrier-borne long-range interceptor armed with radar-guided missiles and tasked with defence against missile-launching bombers, the Phantom II went on to establish itself as one of the most important multi-role fighter, attack and reconnaissance aircraft of the 20th century.Arguably the United States' most important aircraft in the Vietnam War, where it played the role of workhorse as well as being a deadly MiG interceptor, the Phantom was also a mainstay of Atlantic Fleet operations intercepting Soviet bomber and reconnaissance aircraft and turning them away from the carrier groups at the height of the Cold War.This book reveals the design and development history of the naval Phantom, its variants and the exported designs adopted by other NATO countries. Packed with illustrations, photographs and first-hand accounts, it provides a technical history of one of the most famous aircraft ever built.

An in-depth technical study of the USN and export variants of the McDonnell–Douglas F-4 Phantom – sure to appeal to modelers, veterans, and aviation enthusiasts.Originally designed as a carrier-borne long-range interceptor armed with radar-guided missiles and tasked with defence against missile-launching bombers, the Phantom II went on to establish itself as one of the most important multi-role fighter, attack and reconnaissance aircraft of the 20th century.Arguably the United States'' most important aircraft in the Vietnam War, where it played the role of workhorse as well as being a deadly MiG interceptor, the Phantom was also a mainstay of Atlantic Fleet operations intercepting Soviet bomber and reconnaissance aircraft and turning them away from the carrier groups at the height of the Cold War.This book reveals the design and development history of the naval Phantom, its variants and the exported designs adopted by other NATO countries. Packed with illustrations, photographs and first-hand accounts, it provides a technical history of one of the most famous aircraft ever built.

An in-depth technical study of the USN and export variants of the McDonnell–Douglas F-4 Phantom – sure to appeal to modelers, veterans, and aviation enthusiasts.Originally designed as a carrier-borne long-range interceptor armed with radar-guided missiles and tasked with defence against missile-launching bombers, the Phantom II went on to establish itself as one of the most important multi-role fighter, attack and reconnaissance aircraft of the 20th century.Arguably the United States'' most important aircraft in the Vietnam War, where it played the role of workhorse as well as being a deadly MiG interceptor, the Phantom was also a mainstay of Atlantic Fleet operations intercepting Soviet bomber and reconnaissance aircraft and turning them away from the carrier groups at the height of the Cold War.This book reveals the design and development history of the naval Phantom, its variants and the exported designs adopted by other NATO countries. Packed with illustrations, photographs and first-hand accounts, it provides a technical history of one of the most famous aircraft ever built.

F-111s based in England flew the longest fighter combat mission in history against the Libyan capital Tripoli in 1986, and in 1991 the aircraft was one of the most important Coalition warplanes in the successful Desert Storm campaign.The General Dynamics F-111 was one of the most technically innovative designs among military aircraft, introducing the variable-sweep wing, terrain-following radar, military-rated afterburning turbofan engines and a self-contained escape module among other features. Designed as a cost-saving, multi-role interceptor, naval fighter and strike bomber, its evolution prioritised the latter role and it became the USAF''s most effective long-range strike aircraft during three decades of service.Rushed into combat in Vietnam before some of its structural issues were fully understood, the type suffered several early losses and gained an unfairly negative reputation that dogged it for the rest of its career, and restricted funding for more advanced versions of the design, Peter E Davis argues. However, in Operation Linebacker in 1972 the F-111 flew 4000 nocturnal under-the-radar missions, delivering, with unprecedented accuracy, many decisive blows that would have resulted in heavy losses for any other attack aircraft.Featuring illustrations throughout, this volume is ideal for fans of later twentieth-century combat aviation.

F-111s based in England flew the longest fighter combat mission in history against the Libyan capital Tripoli in 1986, and in 1991 the aircraft was one of the most important Coalition warplanes in the successful Desert Storm campaign.The General Dynamics F-111 was one of the most technically innovative designs among military aircraft, introducing the variable-sweep wing, terrain-following radar, military-rated afterburning turbofan engines and a self-contained escape module among other features. Designed as a cost-saving, multi-role interceptor, naval fighter and strike bomber, its evolution prioritised the latter role and it became the USAF''s most effective long-range strike aircraft during three decades of service.Rushed into combat in Vietnam before some of its structural issues were fully understood, the type suffered several early losses and gained an unfairly negative reputation that dogged it for the rest of its career, and restricted funding for more advanced versions of the design, Peter E Davis argues. However, in Operation Linebacker in 1972 the F-111 flew 4000 nocturnal under-the-radar missions, delivering, with unprecedented accuracy, many decisive blows that would have resulted in heavy losses for any other attack aircraft.Featuring illustrations throughout, this volume is ideal for fans of later twentieth-century combat aviation.

The F-4 Phantom II is perhaps the most famous post-war fighter.Primarily used as a land-based fighter-bomber and reconnaissance platform, its naval origins and the immense contribution made to the US war effort in Vietnam by its original carrier-based versions began its legend.This book examines the unique aspects of the Phantom that made it so crucial to US Navy pilots during the Vietnam War – its massive engine power, long range, speed, the most powerful airborne search and fire-control radar installed in a fighter at the time, and of course its versatility as a ground attack and air-to-air platform.Packed with first hand accounts, unique profile artwork and rare photographs this is the history of one of the most important aircraft to be stationed on carriers off Southeast Asia during the war.

The F-4 Phantom II is perhaps the most famous post-war fighter. Primarily used as a land-based fighter-bomber and reconnaissance platform, its naval origins and the immense contribution made to the US war effort in Vietnam by its original carrier-based versions began its legend.This title examines the unique aspects of the Phantom that made it so crucial to US Navy pilots during the Vietnam War – its massive engine power, long range, speed, the most powerful airborne search and fire-control radar installed in a fighter at the time, and of course its versatility as a ground attack and air-to-air platform. Packed with first hand accounts, unique profile artwork and rare photographs this is the history of one of the most important aircraft to be stationed on carriers off Southeast Asia during the war.

The F-4 Phantom II is perhaps the most famous post-war fighter. Primarily used as a land-based fighter-bomber and reconnaissance platform, its naval origins and the immense contribution made to the US war effort in Vietnam by its original carrier-based versions began its legend.This title examines the unique aspects of the Phantom that made it so crucial to US Navy pilots during the Vietnam War – its massive engine power, long range, speed, the most powerful airborne search and fire-control radar installed in a fighter at the time, and of course its versatility as a ground attack and air-to-air platform. Packed with first hand accounts, unique profile artwork and rare photographs this is the history of one of the most important aircraft to be stationed on carriers off Southeast Asia during the war.

A detailed history of the pioneering Bell X-1, the first manned craft to break the sound barrier. Brought to life with dazzling digital art, this rocket-powered aircraft launches Osprey's new 'X-Planes' series and brings the reader into the dangerous and thrilling world of experimental aircraft.In 1947, no one knew if it was possible to break the 'sound barrier'. The Bell X-1 was the tiny, rocket-powered craft that finally broke it. It was the result of innovative designers and engineers turning their attention from the pioneering jets of World War II to a new task – an aircraft designed purely to fly faster than sound. Legendary pilots rallied to the cause, with World War II ace Chuck Yeager piloting the X-1 when it finally achieved supersonic flight in 1947, the first manned craft to reach such speeds.With historical photographs and meticulously researched digital art, Peter Davies traces the whole career of the pioneering Bell X-1, from its early development through to the influence it had on military and civilian jets in the second half of the 20th century.

A detailed history of the pioneering Bell X-1, the first manned craft to break the sound barrier. Brought to life with dazzling digital art, this rocket-powered aircraft launches Osprey''s new ''X-Planes'' series and brings the reader into the dangerous and thrilling world of experimental aircraft.In 1947, no one knew if it was possible to break the ''sound barrier''. The Bell X-1 was the tiny, rocket-powered craft that finally broke it. It was the result of innovative designers and engineers turning their attention from the pioneering jets of World War II to a new task – an aircraft designed purely to fly faster than sound. Legendary pilots rallied to the cause, with World War II ace Chuck Yeager piloting the X-1 when it finally achieved supersonic flight in 1947, the first manned craft to reach such speeds.With historical photographs and meticulously researched digital art, Peter Davies traces the whole career of the pioneering Bell X-1, from its early development through to the influence it had on military and civilian jets in the second half of the 20th century.

A detailed history of the pioneering Bell X-1, the first manned craft to break the sound barrier. Brought to life with dazzling digital art, this rocket-powered aircraft launches Osprey''s new ''X-Planes'' series and brings the reader into the dangerous and thrilling world of experimental aircraft.In 1947, no one knew if it was possible to break the ''sound barrier''. The Bell X-1 was the tiny, rocket-powered craft that finally broke it. It was the result of innovative designers and engineers turning their attention from the pioneering jets of World War II to a new task – an aircraft designed purely to fly faster than sound. Legendary pilots rallied to the cause, with World War II ace Chuck Yeager piloting the X-1 when it finally achieved supersonic flight in 1947, the first manned craft to reach such speeds.With historical photographs and meticulously researched digital art, Peter Davies traces the whole career of the pioneering Bell X-1, from its early development through to the influence it had on military and civilian jets in the second half of the 20th century.

Packed with photos and spectacular new artwork, this book traces the supersonic career and lasting influence of the record-breaking Bell X-2 rocket plane. A must-have for aviation enthusiasts, especially those interested in the thrilling, hi-tech world of the early Jet Age.Even before the spectacular success of its X-1 rocket-powered aircraft in breaking the ‘sound barrier’, the adventurous Bell Aircraft Corporation was already pushing ahead with a parallel project to build a second aircraft capable of far higher speeds. The X-2 (or Model 52) explored the equally uncertain technology of swept-back wings. Now common in modern conventional fighter aircraft, the Bell X-2 was revolutionary in using this type of airframe to probe Mach 3 and research the effects of extreme aerodynamic friction heat on airframes. Although both X-2s were destroyed in crashes after only 20 flights, killing two test pilots, the knowledge gained from the programme was invaluable in developing aircraft that could safely fly at such speeds. Using stunning artwork and historical photographs, this is the story of the plane that ultimately made the Lockheed Blackbird and Concorde possible.

Packed with photos and spectacular new artwork, this book traces the supersonic career and lasting influence of the record-breaking Bell X-2 rocket plane. A must-have for aviation enthusiasts, especially those interested in the thrilling, hi-tech world of the early Jet Age.Even before the spectacular success of its X-1 rocket-powered aircraft in breaking the ''sound barrier'', the adventurous Bell Aircraft Corporation was already pushing ahead with a parallel project to build a second aircraft capable of far higher speeds. The X-2 (or Model 52) explored the equally uncertain technology of swept-back wings. Now common in modern conventional fighter aircraft, the Bell X-2 was revolutionary in using this type of airframe to probe Mach 3 and research the effects of extreme aerodynamic friction heat on airframes. Although both X-2s were destroyed in crashes after only 20 flights, killing two test pilots, the knowledge gained from the programme was invaluable in developing aircraft that could safely fly at such speeds. Using stunning artwork and historical photographs, this is the story of the plane that ultimately made the Lockheed Blackbird and Concorde possible.

Packed with photos and spectacular new artwork, this book traces the supersonic career and lasting influence of the record-breaking Bell X-2 rocket plane. A must-have for aviation enthusiasts, especially those interested in the thrilling, hi-tech world of the early Jet Age.Even before the spectacular success of its X-1 rocket-powered aircraft in breaking the ''sound barrier'', the adventurous Bell Aircraft Corporation was already pushing ahead with a parallel project to build a second aircraft capable of far higher speeds. The X-2 (or Model 52) explored the equally uncertain technology of swept-back wings. Now common in modern conventional fighter aircraft, the Bell X-2 was revolutionary in using this type of airframe to probe Mach 3 and research the effects of extreme aerodynamic friction heat on airframes. Although both X-2s were destroyed in crashes after only 20 flights, killing two test pilots, the knowledge gained from the programme was invaluable in developing aircraft that could safely fly at such speeds. Using stunning artwork and historical photographs, this is the story of the plane that ultimately made the Lockheed Blackbird and Concorde possible.

The revolutionary X-15 remains the fastest manned aircraft ever to fly.Built in the two decades following World War II, it was the most successful of the high-speed X-planes. The ‘sound barrier’ was smashed completely by the X-15, which could hit Mach 6.7 and soar to altitudes above 350,000ft, beyond the edge of space. Several pilots qualified as astronauts by flying above 50 miles altitude in the X-15, including Neil Armstrong, the first man on the Moon.The three X-15s made 199 flights, testing new technologies and techniques which greatly eased America’s entry into manned space travel, and made the Apollo missions and Space Shuttle viable propositions.With historical photographs and stunning digital artwork, this is the story of arguably the greatest of the X-Planes.

A detailed study of one of the US''s most famous post-war aircraft, the F-4 Phantom, which saw service in three branches of the US military during the Vietnam War.Although the F-4 Phantom II was the most important fighter-bomber to see action with all three American services during the Vietnam War, it was essentially a U.S. Navy design, and the carrier-borne squadron crews were its main operators in combat. The aircraft pioneered the use of long-range, radar-guided missiles in combat, although the majority of its Vietnam missions involved ground-attack with a variety of innovative ordnance. From 1968 to 1973 the Phantom II was the standard U.S. Navy fighter in Southeast Asia, having replaced several other types. Its performance and versatility enabled it to perform a variety of different missions, and switch roles as necessary, in the assault on some of the world''s most heavily defended territory.Including detailed colour profiles and first-person commentary from active participants in the F-4''s naval combat history, this is a detailed study of the U.S. armed services'' most famous post-war fighter.

A detailed study of one of the US''s most famous post-war aircraft, the F-4 Phantom, which saw service in three branches of the US military during the Vietnam War.Although the F-4 Phantom II was the most important fighter-bomber to see action with all three American services during the Vietnam War, it was essentially a U.S. Navy design, and the carrier-borne squadron crews were its main operators in combat. The aircraft pioneered the use of long-range, radar-guided missiles in combat, although the majority of its Vietnam missions involved ground-attack with a variety of innovative ordnance. From 1968 to 1973 the Phantom II was the standard U.S. Navy fighter in Southeast Asia, having replaced several other types. Its performance and versatility enabled it to perform a variety of different missions, and switch roles as necessary, in the assault on some of the world''s most heavily defended territory.Including detailed colour profiles and first-person commentary from active participants in the F-4''s naval combat history, this is a detailed study of the U.S. armed services'' most famous post-war fighter.

Ever since its introduction in the late 1950s, the B-52 Stratofortress has been the United States’ primary heavy bomber and a powerful symbol of its immense military might.Its powerful electronic countermeasures equipment (ECM) was thought to make the B-52 immune to ground-to-air missile attack, but in Vietnam, and later conflicts such as Operation Desert Storm in 1991, it came up against the Soviet-designed SA-2 SAM which used heavy salvoes of missiles to bring down the bombers.The losses of several of its most feared, powerful and supposedly invincible bombers per night to a torrent of Soviet missiles during the closing stages of the Vietnam War was sobering to Americans, but the B-52s’ crushing attacks virtually eliminated North Vietnam’s defences and forced a peace settlement. This fascinating book analyses the roles of the SA-2 operators and the B-52 Electronic Warfare Officers (EWOs) using specially commissioned artwork as well as first-hand accounts, and traces the cat-and-mouse tactics that each side employed.

Ever since its introduction in the late 1950s, the B-52 Stratofortress has been the United States'' primary heavy bomber and a powerful symbol of its immense military might. Its powerful electronic countermeasures equipment (ECM) was thought to make the B-52 immune to ground-to-air missile attack, but in Vietnam, and later conflicts such as Operation Desert Storm in 1991, it came up against the Soviet-designed SA-2 SAM which used heavy salvoes of missiles to bring down the bombers.The losses of several of its most feared, powerful and supposedly invincible bombers per night to a torrent of Soviet missiles during the closing stages of the Vietnam War was sobering to Americans, but the B-52s'' crushing attacks virtually eliminated North Vietnam''s defences and forced a peace settlement. This fascinating book analyses the roles of the SA-2 operators and the B-52 Electronic Warfare Officers (EWOs) using specially commissioned artwork as well as first-hand accounts, and traces the cat-and-mouse tactics that each side employed.

Ever since its introduction in the late 1950s, the B-52 Stratofortress has been the United States'' primary heavy bomber and a powerful symbol of its immense military might. Its powerful electronic countermeasures equipment (ECM) was thought to make the B-52 immune to ground-to-air missile attack, but in Vietnam, and later conflicts such as Operation Desert Storm in 1991, it came up against the Soviet-designed SA-2 SAM which used heavy salvoes of missiles to bring down the bombers.The losses of several of its most feared, powerful and supposedly invincible bombers per night to a torrent of Soviet missiles during the closing stages of the Vietnam War was sobering to Americans, but the B-52s'' crushing attacks virtually eliminated North Vietnam''s defences and forced a peace settlement. This fascinating book analyses the roles of the SA-2 operators and the B-52 Electronic Warfare Officers (EWOs) using specially commissioned artwork as well as first-hand accounts, and traces the cat-and-mouse tactics that each side employed.

Of the many futuristic military aircraft concepts created in the 1950s the North American XB-70 still stands out as the most awe-inspiring.With its huge, white partially-folding delta wing, its fuselage resembling a striking cobra and its extraordinary performance, it was one of the foremost technological achievements of the 20th century.A strategic bomber built to outrun any Soviet fighter jet, it could reach Mach 3 with a full nuclear payload - as fast as the legendary SR-71 Blackbird but more than three times the size. However, its role as a nuclear bomber was limited after the introduction of Intercontinental Ballistic Missiles, and defence cuts eventually led to the project being scrapped in the mid-1960s.The Valkyrie had a brief, costly decade of life but it proved the continuing value of developing manned bombers. However, almost half a century after the XB-70 its predecessor, the B-52, continues in service. Using full colour artwork and rigorous analysis, this is the complete story of the ultimate US Cold War military X-plane.

Of the many futuristic military aircraft concepts created in the 1950s the North American XB-70 still stands out as the most awe-inspiring. With its huge, white partially-folding delta wing, its fuselage resembling a striking cobra and its extraordinary performance, it was one of the foremost technological achievements of the 20th Century. A strategic bomber built to outrun any Soviet fighter jet, it could reach Mach 3 with a full nuclear payload - as fast as the legendary SR-71 Blackbird but more than three times the size. However, its role as a nuclear bomber was limited after the introduction of Intercontinental Ballistic Missiles, and defence cuts eventually led to the project being scrapped in the mid-1960s.The Valkyrie had a brief, costly decade of life but it proved the continuing value of developing manned bombers. However, almost half a century after the XB-70 its predecessor, the B-52, continues in service. Using full colour artwork and rigorous analysis, this is the complete story of the ultimate US Cold War military X-plane.

Of the many futuristic military aircraft concepts created in the 1950s the North American XB-70 still stands out as the most awe-inspiring. With its huge, white partially-folding delta wing, its fuselage resembling a striking cobra and its extraordinary performance, it was one of the foremost technological achievements of the 20th Century. A strategic bomber built to outrun any Soviet fighter jet, it could reach Mach 3 with a full nuclear payload - as fast as the legendary SR-71 Blackbird but more than three times the size. However, its role as a nuclear bomber was limited after the introduction of Intercontinental Ballistic Missiles, and defence cuts eventually led to the project being scrapped in the mid-1960s.The Valkyrie had a brief, costly decade of life but it proved the continuing value of developing manned bombers. However, almost half a century after the XB-70 its predecessor, the B-52, continues in service. Using full colour artwork and rigorous analysis, this is the complete story of the ultimate US Cold War military X-plane.

Half a century before the 'flying wing' B-2 stealth bomber entered service, John K. ‘Jack’ Northrop was already developing prototypes of a large 'flying wing' strategic bomber, which would have been the most radical bombers of their age.World War II brought a need for very long-range bombers and Northrop received a contract for a 172-ft span bomber, the B-35. Several of these were built, gradually evolving into the definitive XB-35 configuration. Testing revealed that the aircraft was invisible to radar, but engineers struggled to overcome the design challenges and several pilots were lost in crashes. While the program was cancelled in the 1950s, the concept extended into other highly innovative areas, such as the XP-56 and MX-324 Rocket Wing prototype fighters.But the greatest legacy was the first operational flying wing – the Northrop Grumman B-2 stealth bomber, which used much of the hard-won experience from the pioneering programs of half a century before.

Half a century before the ''flying wing'' B-2 stealth bomber entered service, John K. ''Jack'' Northrop was already developing prototypes of a large ''flying wing'' strategic bomber, which would have been the most radical bombers of their age. World War II brought a need for very long-range bombers and Northrop received a contract for a 172-ft span bomber, the B-35. Several of these were built, gradually evolving into the definitive XB-35 configuration. Testing revealed that the aircraft was invisible to radar, but engineers struggled to overcome the design challenges and several pilots were lost in crashes. While the program was cancelled in the 1950s, the concept extended into other highly innovative areas, such as the XP-56 and MX-324 Rocket Wing prototype fighters. But the greatest legacy was the first operational flying wing – the Northrop Grumman B-2 stealth bomber, which used much of the hard-won experience from the pioneering programs of half a century before.