Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ames.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!ittvax!dcdwest!sdcsvax!sdcrdcf!hplabs!intelca!qantel!dual!ames!al From: al@ames.UUCP (Al Globus) Newsgroups: net.space Subject: Re: SSTO! Message-ID: <822@ames.UUCP> Date: Thu, 28-Feb-85 13:39:57 EST Article-I.D.: ames.822 Posted: Thu Feb 28 13:39:57 1985 Date-Received: Mon, 4-Mar-85 08:16:28 EST References: <699@mordor.UUCP> Organization: NASA-Ames Research Center, Mtn. View, CA Lines: 20 > From: WOO IL LEE> > > From "Aerospace Americe", Feb. 85, pg.1: > > .......Robert Cooper, director of the Defense Advanced Research Projects > Agency, says that variable geometry hydrogen-burning supersonic-combustion > ramjets (SCRAMjets) "using current state-of-the-art technology" could take > off horizontally and accelerate to Mach 25, using existing Pratt & Whitney > RL-10 rocket engines for final orbit injection. Motivation for their > development, he said, is the need to reduce payload launch costs to $100/lb. > > > ------ It should be noted, however, that horizontal takeoff results in an orbiter with wings that are twice as heavy and a body half again as heavy as vertical takeoff. This data is in the same issue but a different article. The effect is caused by aerodynamic loads generated during pullup.