Documents / Report
This Defense Intelligence Reference Document, prepared by the Defense Intelligence Agency and dated 8 March 2010, was produced under the Advanced Aerospace Weapon System Applications (AAWSA) Program. It gives a historical and technical review of how to reach space and return. It covers hypersonic gliders, air-breathing and rocket propulsion, thermodynamics and materials, and launch options. It argues that reliable, schedulable access to low Earth orbit is mainly a hardware and propulsion problem rather than a technology one.
“Lockheed”5 pages
0 ·~ " '"'"0 " "'' 2'¢; 2i u C 0 ".D "¼ 10 8 Model 6 4 ,,,,,. UNCLASSIFIED/;'P8R 8ffllil.t.k WE&i QIIL>C I I I I 176 I \ I .;o>'-" -p:1u:,:._ - ' ' Minimum Acceptable Initial Speed / Based on Accelerated Stall Margin \ I I \ Psychological L1m1tDue \ V to Excessive Initial Speed \ / ~ \ \ \ ' r-- .... ' .... .... '........ ~ ',,, '.,., . J-<, J jci Half-Com; - -.:::::.' .... ,,,.,,.- ~, .... ---.... ---- --- -- --2 ~ L1m1t Due to Margin Flare 1 capab,hty I 0 10 0 120 140 16 0 180 200 220 Flare Imti at1 on Speed (percent of m1mmum speed) % V mm - 240 Figure 15. Both Delta Planform Lifting Body (Dynasoar) and Model 176 Dffer Superior Landing Performance Thermodynamics and Materials - - 260 The structure of Model 176 was based on diffusion-bonding and super-plastic forming of flat titanium sheets. Forty years ago, the method was called "roll bonding" and executed with the titanium sealed within an evacuated steel envelope and processed in a steel rolling plant. With a lot of effort and chemical leaching, the titanium part was freed from its steel enclosure. All of that has been completely replaced today by the current titanium diffusion-bonding and super-plastic forming industrial capabilities. The photo in Figure 16 is from a Society of Automotive Engineers book titled Advanced Engine Development at Pratt & Whitney: The Inside Story of Eight Special Projects 146- 1971, by Dick Mulready. Chapter 6, "Boost Glide and the XLR-129 - mach 20 at 200,000 Feet," shows a surviving remnant from the 1960s program. The super-plastic-forming, diffusion bonding that was so difficult in early 1960 is now an accepted fabrication procedure. One of the F-lS's major bulkheads was fabricated from titanium sheet elements using this procedure instead of machining away more than 90 percent of a titanium forging. Had the procedure been adopted as a product- manufacturing method, it would have eliminated the almost 2-year manufacturing cycle in acquiring titanium forging of the wing spars and major bulkheads. Note that only 2.5 percent of the thermal heating enters the primary structure. 16 UNCLASSIFIED/ ;CEiOAt OFFIQI.Ctk Wli&i &••LY
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 56 pages are in the text index: search them above, or from the library's search.