14 votes
Accepted

Saturn 1 thrust mismatch

There were different versions of the RL 10 engine with different thrusts. The retired RL10A-1, first flown 1962 had a thrust of 67 kN (15,000 lbf). The active RL10B-2, first flown 1998 has a thrust of ...
Uwe's user avatar
  • 49k
9 votes
Accepted

Do Orion's solar panels have adjustable sweep?

It appears that the Solar Array Drive Mechanism (SADM) serves two primary purposes: Orient the solar panels toward the sun for maximum power generation. From Spaceflight 101: The wing is connected ...
Matthew R.'s user avatar
6 votes
Accepted

Why is ESA developing the Vinci engine rather than buying RL10Bs?

The RL10 is a terribly expensive engine to produce (I've seen estimates of US$25 million per unit), mainly due to its welded-tube nozzle construction. I expect Vinci will be substantially cheaper to ...
Russell Borogove's user avatar
3 votes

Why does the RL10 engine have a pipe sticking out of the side on the Centaur rocket?

I can't find a single source that definitely states it, but I'm pretty sure it's a hydrogen vent collector manifold. This document predates the Common Centaur shown in the video, but it mentions the ...
Organic Marble's user avatar
2 votes

Is there an upper stage main engine that is human ratable and may out perform the Common Extensible Cyrogenic Engine performance by Aerojet?

Supplemental to Organic Marble's answer: Additional questions include: 1) Is the RL10B-2 used as a testbed for the CECE? Are the CECE, physical dimension the same as the as the RL10B-2? The RL10B-...
Russell Borogove's user avatar
2 votes

Is there an upper stage main engine that is human ratable and may out perform the Common Extensible Cyrogenic Engine performance by Aerojet?

Upper stage engines used or planned for human cargo: RL10 / Atlas 5 & ICPS & EUS / Good performance (Isp > 400) RD-110 / Soyuz / OK performance (Isp > 300) Merlin / Falcon / OK performance (...
Organic Marble's user avatar

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