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The Atlas II was the last Atlas rocket to use the "stage-and-a-half" technique, where it ignited all 3 RS-56 engines at liftoff and then jettisoned the 2 RS-56-OBA side engines and their support structure during ascent. The two RS-56-OBA engines were integrated into a single unit called the MA-5A and shared a common gas generator.
The resulting conceptual heavy-lift vehicle was called "Atlas Phase 2" or "PH2" in the 2009 Augustine Report. An Atlas V PH2-Heavy (three 5 m stages in parallel; six RD-180s) along with Shuttle-derived , Ares V and Ares V Lite, were considered as a possible heavy lifter concept for use in future space missions in the Augustine Report. [ 29 ]
First (of two) Bell XV-3s, 54–147, first flown 11 August 1955, crashes this date when pilot Dick Stansbury blacks out due to extremely high cockpit vibrations when the rotor shafts are moved 17 degrees forward from vertical. Pilot is seriously injured and airframe is damaged beyond repair.
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For little ones who already own a Toniebox starter set, there are lots of Tonies character bundles on sale right now that would make great stocking stuffers, like Marvel's Spidey & His Amazing ...
Most liquid engines use a bipropellant, consisting of two liquid propellants (fuel and oxidizer) which are stored and handled separately before being mixed and burned inside the combustion chamber. Hybrid-propellant rockets use a combination of solid and liquid propellant, typically involving a liquid oxidizer being pumped through a hollow ...
Heavy snow showers of 1 to 2 feet are expected to blanket in the Colorado Rockies and Intermountain West this week, with isolated areas seeing up to 4 feet of the white stuff as a cyclone moves ...