An Afsc Forecast II Requirement. The Aerospace Plane Was Described By Afsc Personnel In Conference As Being 150 To 200 In Length With Delta Configuration With 400,000 Pound Gross Weight--20,000 Pound Payload To Be Carried In A Shuttle Type Bay Of 15 Diameter And 50 In Length. Powered By Both Aerojet And Rocket It Would Take Off Vertically For Runaway And Have A Very Steep Climb Out.