Lockheed CL-400 Suntan

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CL-400

3-view of the Suntan concept aircraft
Type Proposed reconnaissance aircraft
Manufacturer Lockheed Aircraft Corporation
Designed by Clarence L "Kelly" Johnson

Suntan was the code-name of a prototype reconnaissance aircraft program, with the goal of creating a much faster and higher-altitude successor to the U-2, enabled by the use of liquid hydrogen (LH2) as fuel. From 1956-1958, the United States Air Force funded a highly secretive program of research and development on the aircraft (the CL-400, designed at the Lockheed Skunk Works) and engine design, and made significant investments in large-scale LH2 production. In addition to Lockheed, Pratt and Whitney (part of United Aircraft, now United Technologies Corporation) played a major part. Program successes included the concept design of a Mach 2.5 aircraft capable of flying at 30,000 meters, and successful conversion of an existing turbojet engine to run on liquid hydrogen, as well as 25+ hours of testing on a customized LH2 engine design.

Ultimately, budgetary pressures and difficulty achieving sufficient range, plus the fact that an LH2 powered aircraft was considered too dangerous[1] and expensive to maintain led to the project's cancellation. In addition, the unusual fuel would have meant that existing airbases would have needed extensive facilities to handle the aircraft.

However, the aircraft research was redirected to more conventionally-fueled designs and resulted in the successful SR-71.

By advancing the state of the art in LH2 propulsion, and by establishing an industrial infrastructure for high-volume hydrogen production, the groundwork was laid for successful use of liquid hydrogen as a rocket fuel for the Apollo program and the Space Shuttle.

[edit] Notes

  • Chapter 8, "Suntan," in LIQUID HYDROGEN AS A PROPULSION FUEL, 1945-1959 from the NASA History Office [2]

[edit] See also

[edit] References

  1. ^ [1] Gen. Curtis E. LeMay... received a full briefing on Suntan and his initial reaction brought dismay to the team. "What," he exploded, "put my pilots up there with a ... bomb?"
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Aircraft produced by Lockheed
Manufacturer
designations

Basic Model Numbers: L-1 · L-2 · L-3 · L-4 · L-5 · L-7 · L-8 · L-9 · L-10 · L-11 · L-012 · (L-013 not assigned) · L-014 · L-015 · L-016 · L-017 · L-018 · L-019 · L-020 · L-021 · L-022 · L-023 · L-024 · (L-025 not assigned) · L-026 · L-027 · (L-028 not assigned) · L-029 · L-030 · L-031 · L-032 · L-033 · L-034 · L-035 · (L-036 not assigned) · L-037 · (L-038 and L-039 not assigned) · L-040 · L-041 · L-042 · L-044 · L-045 · L-049 · L-050 · L-051 · L-052 · L-060 · L-061 · L-062 · L-075 · L-080 · L-081 · L-082 · L-083 · L-084 · L-085 · L-086 · L-087 · L-088 · L-089 · L-090 · L-091 · L-092 · L-093 · L-094 · L-092 · L-099 · L-100 · L-193 · L-245 · L-246 · L-300 · L-329 · L-351 · L-500 · L-645

California Lockheed Temporary Design Numbers (TDN): CL-282 · CL-288 · CL-295 · CL-320 · CL-325 · CL-329 · CL-346 · CL-379 · CL-400 · CL-407 · CL-475 · CL-595 · CL-704 · CL-760 · CL-823 · CL-901 · CL-915 · CL-934 · CL-981 · CL-984 · CL-985 · CL-1026 · CL-1195 · CL-1200 · CL-1400 · CL-1600 · CL-1700 · CL-1800 · CL-1980 ·
By role

Airliners and Civil Transports: Vega · Electra · Electra Junior · Super Electra · Lodestar · Constellation · Saturn · Electra · L-402 · JetStar · L-1011

Military Transports: C-64 · C-121 · R6V · C-130/C-130J · C-141 · C-5 · TriStar

Experimental/Prototypes: NF-104A · XFV · XF-90 · XF-104 · XH-51 · XP-49 · XP-58 · XV-4 · YP-24

Fighters: P-38 · P/F-80 · F-94 · F-104 · F-16  · F-117 · F-22 · F-35

Helicopters: XH-51 · AH-56

Patrol: Hudson · PV · P-2 · P-3 · S-3 · CP-140

Reconnaissance: U-2 · A-12 · SR-71

Trainers: T-33 · T2V/T-1
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