Questions tagged [be-3]

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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 ...
10
votes
4answers
2k 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 ...
3
votes
0answers
32 views

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 ...