When will the X-33 come out?, page
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reply posted on 26-8-2004 @ 10:26 AM by MarkLuitzen
DC-X 1/3 Scale Demonstrator

In 1991 Scaled Composites was selected by McDonnell Douglas Aerospace for the SDIO Single Stage to Orbit demonstrator program. MDA proposed a lightweight 1/3 scale proof of concept (POC) demonstrator vehicle to validate the rocket powered vertical take off and landing concept.
Scaled was tasked with building the structural aeroshell and aerodynamic control surfaces. The DC-X aeroshell has a height of 62 feet and a maximum width of 15 feet at the base. Four large hydraulically-actuated flap sections are incorporated into the aeroshell for aerodynamic control during reentry and landing. A removable nose cone houses the emergency parachute recovery system. Also incorporated into the aeroshell was a "finger ring" used to restrain and stabilize the fuel tanks during temperature induced expansion and contraction cycles. The retractable landing gear are mounted to the aeroshell structure and all landing gear loads are reacted through the aeroshell. This structural philosophy would benefit the overall vehicle both in weight and complexity. Scaled employed low cost tooling methods for fabrication of the DC-X structure. A 1/4 fuselage section male plug was fabricated from the loft lines supplied by MDA. A single female tool was fabricated from the male plug, and the four graphite/epoxy sandwich panel sections were fabricated in the female tool. The sections were installed in an assembly fixture and bonded together using in-place graphite/epoxy laminates. The landing gear receptacles, flap mechanisms and servos were then added. The materials and structural design of the sandwich panel proved to be capable of maintaining structural integrity under the extreme conditions of the operating environment.
In order to deliver the aeroshell structure in a timely fashion, Scaled did not delay the aeroshell fabrication schedule while waiting for the resolution of sub-systems integration issues. Scaled sent a structures team to MDA's facility to support the final installation of the subsystems, which were often performed as minor repairs to the aeroshell structure. This was made possible because the vehicle was not an autoclaved or high-temperature-cured structure; the low-temperature curing and simple manufacturing process allowed this prototype flexibility. Despite all the post fabrication modifications, Scaled was able to build the complete aeroshell structure for 300 lb (10%) less than the weight goal. This weight reduction was instrumental in helping the DC-X vehicle stay within its weight budget.
Scaled was responsible for the emergency parachute recovery system. Scaled selected a parachute vendor and worked closely with that vendor to insure a timely and cost effective response to the program schedule. Scaled fabricated the necessary parachute test/qualification components and supervised all the qualification testing for the recovery system. Scaled's team was also dispatched to the White Sands launch facility to support additional modifications and repairs to the aeroshell structure during the test program.




this one i like but was only a prototype...:S


reply posted on 16-9-2004 @ 04:23 AM by Sigma
Well look what I found! It seems that the X-33 might be able to fly anyways!

www.spacedaily.com...

According to the link, it seems that Northrop Grumman have built and tested a successful cryotank, capable of repeated use! To me it would be inexcusable not to use this on the X-33 project, considering all the effort that went into its research and design. Ofcourse, I am sure that Nasa will come up with a reason not to use it with the X-33, instead opting for a new project that will set our space program back another 10 years.
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