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rapbo
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The answer RAPBO has 0 possible clue(s) in existing crosswords.
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There are 5 letters in RAPBO ( A1B3O1P3R1 )
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Raptor is a staged combustion, methane-fueled rocket engine under development by SpaceX. The engines are powered by cryogenic liquid methane and liquid oxygen (LOX), rather than the RP-1 kerosene and LOX used in all previous SpaceX Falcon rockets which use Merlin 1C & D engines. The earliest concepts for Raptor considered liquid hydrogen (LH2) as fuel rather than methane. The Raptor engine will have two to three times the thrust of the Merlin 1D engine that powers the current Falcon 9 launch vehicle. * The broad Raptor concept as announced in 2013 was "a highly reusable methane staged-combustion engine that will power the next generation of SpaceX launch vehicles designed for the exploration and colonization of Mars". According to SpaceX founder Elon Musk, this design was explicitly intended to achieve full reusability of all rocket stages and, as a result, "a two order of magnitude reduction in the cost of spaceflight".A variety of Raptor engines were planned to be used on both stages of the several vehicle designs announced in September 2016: ITS launch vehicle, as well as both of the long-duration spacecraft used to support all aspects of the Interplanetary Transport System on-orbit. Those vehicle designs were the ITS tanker—a transport carrier of propellant cargo to Earth orbit—and also the Interplanetary Spaceship—a very long-duration carrier of both passengers and space cargo to interplanetary destinations, and which was also to serve in the 2016 mission architecture as both a descent and ascent vehicle at Mars—were to be powered by six vacuum-optimized Raptor rocket engines with three additional sea-level-nozzle Raptor engines to be used for maneuvering. The ITS booster stage was to be powered by 42 Raptors. Unlike nearly all other launch vehicles or spacecraft, on all Earth-away launches, the long-duration spacecraft (tanker or spaceship) designs would also provide second-stage acceleration to orbital velocity; all propulsion was to be provided by Raptor engines. In a 2017 change to the launch vehicle design, Musk presented a smaller-sized (but still super heavy-lift) launch vehicle with the name BFR that would use a smaller number of Raptor engines.The engine development from 2009 to 2015 was funded exclusively through private investment by SpaceX, and not as a result of any funding from the US government. In January 2016, SpaceX did agree with the US Air Force to take US$33.6 million in defense department funding in order to develop a particular Raptor model: a prototype of a new upper-stage variant of the Raptor engine designed for potential use as an upper stage on Falcon 9 and Falcon Heavy, with SpaceX agreeing to fund at least US$67.3 million on the same upper-stage development project, on a minimum 2:1 private-to-government funding basis. In August 2016, a development Raptor engine was shipped to their McGregor testing facility in Texas, where it has been undergoing development testing. The first test firing on a gr... |