YouTube - XB-70 Valkyrie
6 x 28,000 lbs. ea.
185 ft. 10 in.
XB-70 Valkyrie bomber aircraft were conceived in principle in the 1950's.
It was 1955 when the XB-70 Valkyrie general design took shape.
In December of 1957 a contract for the development of the XB-70 Valkyrie was awarded to North American Aviation.
The XB-70 Valkyrie was built from titanium and stainless steel honeycomb panels. Its design took advantage of "compression lift." Compression lift occurs as the aircraft is increasingly supported by its own sonic shock wave as speed increases. The aircraft had the ability to lower their wing tips up to 65 degrees to add high speed stability. The XB-70 Valkyrie carried all of its weapons internally to keep drag to a minimum while enabling Mach 3 flight. Its fuel capacity was similar to conventional bombers, but its range was about half as far.
Missions of the XB-70 Valkyrie, both to and from the target, were to be flown at Mach 3 speeds and at very high altitudes.
In December of 1959, the United States Air Force reduced the development program to a single XB-70 Valkyrie prototype.
On May 1, 1960, the United States Air Force decided to change the mission of the XB-70 Valkyrie from bomber-reconnaissance-strike to advanced high speed aerodynamic research. With the advent of high flying, accurate, surface to air missiles, it was believed that even at such high speeds and altitudes, the XB-70 Valkyrie, due to its lack of maneuverability, would be vulnerable. Another consideration was the large radar and exhaust signature of the aircraft. Furthermore its delta wing design did not allow for efficient low level flight.
In July of 1960, funding for the program was restored with an anticipated production of twelve aircraft.
On March 1, 1961, the program was reduced to two aircraft.
On September 21, 1964, the XB-70 Valkyrie prototype took to the sky.
On July 17, 1965, the second prototype flew for the first time. The first XB-70 Valkyrie had weaknesses in the honey comb construction, hydraulic leaks, and landing gear difficulties. The second aircraft had resolved most of these issues.
During a photo shoot on June 8, 1966, the second XB-70 Valkyrie prototype collided with a chase plane. Both aircraft were lost.
The first XB-70 Valkyrie prototype made a total of 83 flights before being retired on Feb. 4, 1969.
Data obtained from the XB-70 Valkyrie program helped contribute to the United States supersonic transport program and the development of the B-1 bomber.
The XB-70 Valkyrie scratch built by Steve Manganelli has a wingspan of 36 in. and length is 58 in. Steve powers it with three Wemotec mini fans. Weight is about 85 oz.
The fantastic XB-70 Valkyrie built by Jim of RC Groups weighs about 30 lbs. Wingspan is 67 in. The length is 111 in. and power comes from four HW 730's.