Editing SpaceX Merlin (section)

===Merlin 1B===
The '''Merlin 1B''' rocket engine was an upgraded version of the Merlin&nbsp;1A engine. The turbopump upgrades were handled by Barber-Nichols, Inc. for SpaceX.<ref name="BNI">{{cite web |url=https://www.barber-nichols.com/products/rocket-engine-turbopumps |title=Merlin LOX/RP-1 Turbopump |publisher=Barber Nichols |access-date=May 28, 2018 |archive-date=May 29, 2018 |archive-url=https://web.archive.org/web/20180529203257/https://www.barber-nichols.com/products/rocket-engine-turbopumps |url-status=live }}</ref> It was intended for [[Falcon&nbsp;1]] launch vehicles, capable of producing {{cvt|85000|lbf|kN|order=flip}} of thrust at sea level and {{cvt|95000|lbf|kN|order=flip}} in vacuum, and performing with a specific impulse of {{cvt|261|isp|km/s}} at sea level and {{cvt|303|isp|km/s}} in vacuum.

The Merlin 1B was enhanced over the 1A with a [[turbine]] upgrade, increasing power output from {{cvt|2000|hp|kW|order=flip}} to {{cvt|2500|hp|kW|order=flip}}.<ref name="feb05update">{{cite web |archive-url=https://web.archive.org/web/20080415015952/http://www.spacex.com/updates_archive.php?page=0205-0505 |archive-date=April 15, 2008 |url-status=dead |url=http://www.spacex.com/updates_archive.php?page=0205-0505 |publisher=SpaceX |author=Elon Musk |title=Feb 2005 through May 2005 Update}}</ref> The turbine upgrade was accomplished by adding additional nozzles, turning the previously partial-admission design to full admission. Slightly enlarged impellers for both RP-1 and LOX were part of the upgrade. This model turned at a faster 22,000&nbsp;rpm and developed higher discharge pressures. Turbopump weight was unchanged at {{cvt|150|lb|kg|order=flip}}.<ref name="BNI"/>
Another notable change over the 1A was the move to [[Triethylaluminium|TEA]]–[[Triethylborane|TEB]] ([[pyrophoric]]) ignition over torch ignition.<ref name="feb05update"/>

Initial use of the Merlin 1B was to be on the [[Falcon&nbsp;9]] launch vehicle, on whose first stage there would have been a cluster of nine of these engines. Due to experience from the Falcon&nbsp;1's first flight, SpaceX moved its Merlin development to the Merlin&nbsp;1C, which is regeneratively cooled. Therefore, the Merlin&nbsp;1B was never used on a launch vehicle.<ref name="merlin_wired"/><ref name="merlin_nasaspaceflight"/>
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