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by Karellen 886 days ago
> who else has or is planning to develop a methane engine?

BO's New Glenn first stage, RocketLab's Neutron, and Relativity Space's Terran 1/Terran R, are all/will all be methane.

> which other widely used engines used H2?

Ariane 5 and 6, and the upper stages of previous Ariane rockets

https://en.wikipedia.org/wiki/Rocket_propellant#Current_cryo...

Edit: Long March 9 will be mostly methane, with hydrogen upper stage.