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Questions tagged [be-3]

The BE-3 (Blue Engine 3) is a LH2/LOX rocket engine developed by Blue Origin. The engine is being used on the New Shepard suborbital rocket. For Blue Origin's orbital launch vehicle, New Glenn, Blue Origin has developed an open expander cycle variant of the BE-3, the BE-3U, for use in upper stages. (from Wikipedia)

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Blue Origin's BE-3PM Engine: 18-100% Throttle Range, How?

Blue Origin says the BE-3PM engine in its New Shepard vehicle can throttle down to 18% max thrust. Compare to 57% for the Merlin 1D engine in stage 1 of SpaceX's Falcon 9 (and to 39% for the Merlin ...
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11 votes
4 answers
3k views

Why RP-1 and not Methane for Falcon 9's Merlin engines?

I've seen methane described as the best of both worlds---the worlds being hydrogen's energy density + pain-in-the-ass factor and RP-1's lower energy density + ... ease of use? And this has me ...
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3 votes
1 answer
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Blue Origin BE-3/BE-4 Specific Impulse?

Wikipedia lists 490 kN (110,000 lbf) thrust for BE-3 at sea level and 710 (160,000 lbf) kN in vacuum. BE-4 is listed at a stupefying 2.4 MN (550,000 lbf) at sea level. But no numbers are given for ...
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