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There was a large difference in their size, and at the time, they were developed by two entirely different companies. In general, the propellant combination of a rocket engine does not determine its thrust, just as an internal combustion engine running on diesel fuel may power anything from a lawnmower to a tractor-trailer truck. The LR87 was developed by ...


1

That is a complex question that depends on what the company's goals are among many other things. If the intention is to create a rocket with the highest specific impulse then hydrogen is the way to go. Although why that of itself would be the goal is unclear. Hydrolox engines have a potential performance advantage in upper stages. However the benefits are ...


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