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19 votes
Accepted

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

SpaceX chose to use RP-1 because the development path for a good RP1 engine was a full decade shorter! Plus many other factors favoring KeroLox for launch from Earth surface, for example the very high ...
CuteKItty_pleaseStopBArking's user avatar
5 votes

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

Because in 2002 there were no existing methane engines they could use or copy (at least none suitable for a booster). SpaceX didn't have the time or money to develop a whole new engine using a whole ...
John Bode's user avatar
  • 2,300
5 votes

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

The first methalox engine I've been able to find, the RS-18, was developed two years after the first flight of Falcon 1 and the Merlin engine. In contrast, RP-1 had a half-century of development ...
Mark's user avatar
  • 15.3k
3 votes

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

In addition to the factors already mentioned: The Falcon operates in a very different economic model than anything that has come before. Look at the electronics industry for a comparison, ...
Loren Pechtel's user avatar
2 votes

Blue Origin BE-3/BE-4 Specific Impulse?

A few years ago I estimated 315s SL and 340s Vacuum: https://forum.nasaspaceflight.com/index.php?topic=39674.msg1504802#msg1504802 The main things that affect this are chamber pressure and expansion ...
saolof's user avatar
  • 191

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