Re:SpaceshipTwo crashes shortly after Mojave test flight
by dandelany on Friday October 31, 2014 @05:33PM
(#8541233)
Point 1 is a good one, point 2 is not. Yes, liquid engines like the sort used on Antares, Soyuz (most reliable rocket ever built), Falcon, Proton, Atlas, Shuttle, Delta, Ariane, Saturn, and nearly every other orbital launch platform ever. Liquid/liquid engines, by any measure, are orders of magnitude more stable and well proven than hybrid rocket engines.
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Re:SpaceshipTwo crashes shortly after Mojave test flight
by termain on Friday October 31, 2014 @06:10PM
(#8541342)
My point is that they still fail. Both liquid and solid boosters are a lot more mature than hybrids, no doubt. But I'm not so sure that either is fundamentally more reliable. And for hybrids to mature, somebody has to use them.
"Liquid/liquid engines, by any measure, are orders of magnitude more stable."
What do you mean by stable?
A reason to go with hybrids, at least on paper, is that they are mechanically simple but throttlable, hopefully combining the simplicity of a solid booster with the ability to throttle and shutdown of a liquid.
Of course, much of that also applies to blowdown liquid systems, and I personally find a blowdown methane/lox system particularly compelling. I figure Virgin wanted to avoid cryogens, though.