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- Q1516025 subject Q16269887.
- Q1516025 subject Q4455.
- Q1516025 subject Q7020479.
- Q1516025 subject Q7021196.
- Q1516025 subject Q8672072.
- Q1516025 abstract "The NK-33 and NK-43 are rocket engines designed and built in the late 1960s and early 1970s by the Kuznetsov Design Bureau. The NK designation is derived from the initials of chief designer Nikolay Kuznetsov. They were intended for the ill-fated Soviet N-1 rocket moon shot. The NK-33 engine is among the highest thrust-to-weight ratio of any Earth-launchable rocket engine, only NPO Energomash RD-253 and SpaceX Merlin 1D engine achieve a higher ratio. The specific impulse of the NK-33 is significantly higher than both these engines.The NK-43 is similar to the NK-33, but is designed for an upper stage, not a first stage. It has a longer nozzle, optimized for operation at altitude, where there is little to no ambient air pressure. This gives it a higher thrust and specific impulse, but makes it longer and heavier.Modified versions of these engines by Aerojet are known as the AJ26-58, AJ26-59 and AJ26-62.In 2010 stockpiled NK-33 engines were successfully tested for use by the Orbital Sciences Antares light-to-medium-lift launcher. However, manufacturing defects in the engine's liquid oxygen turbopump and design flaws in the hydraulic balance assembly and thrust bearings were proposed as two possible causes of the 2014 Antares launch failure. This failure led Orbital Sciences to replace the AJ-26 engines with newly built RD-181 engines for future launches of the Antares rocket.".
- Q1516025 thumbnail Aerojet_AJ26_in_the_Stennis_E-1_Test_Stand_-_cropped.jpg?width=300.
- Q1516025 wikiPageExternalLink index.htm.
- Q1516025 wikiPageExternalLink nk33_specs.shtml.
- Q1516025 wikiPageExternalLink watch?v=MZnYr94aa9E.
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- Q1516025 wikiPageWikiLink Q7020479.
- Q1516025 wikiPageWikiLink Q7021196.
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- Q1516025 comment "The NK-33 and NK-43 are rocket engines designed and built in the late 1960s and early 1970s by the Kuznetsov Design Bureau. The NK designation is derived from the initials of chief designer Nikolay Kuznetsov. They were intended for the ill-fated Soviet N-1 rocket moon shot. The NK-33 engine is among the highest thrust-to-weight ratio of any Earth-launchable rocket engine, only NPO Energomash RD-253 and SpaceX Merlin 1D engine achieve a higher ratio.".
- Q1516025 label "NK-33".
- Q1516025 depiction Aerojet_AJ26_in_the_Stennis_E-1_Test_Stand_-_cropped.jpg.