Tag Archives: hotfire

The reused Falcon roars before flight, and RS-25 roars again

The first reflown Falcon 9 core is on the pad at LC-39A, and has completed a hotfire test.  Due to the test having slipped to today, launch is now targeted for Thursday.  Payload was not installed on the rocket for this test; the rocket will be brought down and back to the assembly building for attachment of SES-10 payload before being rolled back to the pad later this week.

If that was exciting, here’s another hotfire test for you, this time of an RS-25 engine in the venerable A-1 test stand, originally built to test Saturn S-II stages.  This engine design will also be making reflights, but that’s less surprising, as  the RS-25 is better known as the Space Shuttle Main Engine.  This particular test, performed late last week at Stennis, was to validate a new engine controller.  The engine used for this test was Engine No. 0528.  It has never been to space; it’s a ground test article. Although designed as the world’s first fully reusable liquid rocket engine for first stage ascent, the SLS program is expected to exhaust the entire supply of RS-25s.

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LC-39A: Bringing the Heat Back

As part of routine preparations for the upcoming Dragon flight to the ISS, SpaceX has also passed a historic milestone: allowing the flame trench at LC-39A to taste fire again.

Ignition is around two minutes into the video.  Several things to note in this video: the extra-large Falcon 9 strongback, designed to support the Falcon Heavy, the Shuttle-era hardware still resident (particularly the Fixed Service Structure and Rotating Service Structure, although both have been stripped of most of their equipment, as well as the huge Apollo-era water tower for the sound suppression system), and the distant white shape of the SpaceX Falcon 9 assembly building at LC-39A.  Never before have rockets been assembled at LC-39A; the pad was built for the gigantic Saturn V, which was assembled in the VAB and then ponderously rolled to the pad, and then the same strategy was employed for the Space Shuttle program.  But Falcon 9 is a much simpler vehicle, and does not require such a large assembly hall as the VAB.

The Falcon 9 hotfire test concluded successfully. The vehicle will be lowered and pulled into the assembly hall for attachment of the Dragon spacecraft.  After returning to the pad with payload installed, Falcon 9 is slated to lift off February 18 on a mission to the ISS, returning LC-39A to service for the first time since 2011.  SpaceX has additional flights already manifested for LC-39A; the next will be EchoStar 23 no earlier than February 28, and SES 10 sometime in March.  The SES 10 launch will be closely watched, as it will feature the first reflown Falcon 9 core.

Just for fun reference, here’s the last flight from LC-39A:

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