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The vehicle would have used both air breathing ram or scramjet propulsion as well as a rocket engine, carrying both RP-1 and LH2 propellant as well as on-board stores of LOX. The X-24C-L301 languished at the design phase when the X-24C project was shelved in September 1977 due a tight NASA budget.
30 Νοε 2023 · The Lockheed X-24C was a 1970s attempt to bring hypersonic speeds – or speeds above Mach 5 – to the United States Air Force via a rocket plus scramjet combo. But in the end, budget priorities shelved the X-24C.
18 Νοε 2023 · The scramjet engine would propel the X-24C at sustained speeds in excess of Mach 6, reaching intended peak speeds that were higher than Mach 8, or more than 6,130 miles per hour.
It was further concluded that the performance of a blended wing body configuration surpassed that of a lifting body design for typical X-24C missions. The cost of a two vehicle program, less engines, B-52 modification and contractor support after delivery, can be kept within $70M (in Jan. 1976 dollars).
30 Μαΐ 2021 · Two versions were proposed: one with cheek air intakes and air-breathing engines, and one with the XLR-99 rocket engine of the X-15. By September 1977 (officially) budget overruns were apparent and NASA agreed to cancel further X-24C work.
22 Νοε 2024 · Scramjet Engine for X-24C. Initially, the X-24C was designed to carry the XLR-99 engine, which had been used previously on the X-15.
The vehicle launched at 31.75 Mg from the B-52 can cruise for 40 seconds at Mach 6.78 on scramjets. Without scramjets it can approach Mach 8 with a 453.6 Kg payload or do 70 seconds of cruise at Mach 6 with a 2.27 Mg payload. Reduction in cost is possible with a vehicle scaled to a lesser mass and capability.
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