Reply to post: Wardsback

Jeff Bezos fires off a blue dart, singes Elon Musk and SpaceX

Anonymous Coward
Anonymous Coward

Wardsback

"By way of comparison, the Merlin engine used in SpaceX's rockets emit 190,000 pounds of thrust. Which is why SpaceX packs nine of them into a single Falcon 9 rocket."

Actually you have that backwards, they needed 9 engines (because 1/9th of total thrust is approximately the right amount you need to land again). They also wanted to target approximately 4,500 kg GTO in the first version; so that gets you the original spec for Merlin 1C. Now they can do over 4,500 kg to GTO reusable.

Blue Origin however went for 7:1 ratio which means they need to throttle down a lot (65% throttle, if not a bit lower, which is typically less efficient). How much that will limit payload with reusability remains to be seen.

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