SpaceWorks Engineering posts high-resolution a animation of their proposed Foresight project to explore a near earth asteroid: Foresight: A Radio Beacon Mission to Near Earth Asteroid Apophis - SpaceWorks Engineering, Inc. . The project earlier won a design award from the Planetary Society .
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As Dick Stafford did , I missed the link to the video when I read this article about the Lockheed-Martin test of a scale prototype spaceplane on an UP Aerospace rocket: Lockheed-Martin test flight - KRQE.com
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A tutorial comparing rocket and air breathing propulsion: Air Breather's Advantage - Gravity Loss - Apr.21.08 . Id say if you want a comprehensive push for better launcher propulsion, concentrate the majority of effort on the much easier problem on making better rocket engines. Better by being reliable and reusable and requiring little maintenance or operations complexity. ...