Question

How efficient is rocket engine clustering?

Answer 1

Rocket Equation. This is just a guess, but presumably it applies to all rockets. If you can get the Specific Impulse and any other data from the rocket makers, ofrfind it for the fuel mix on the web, you should get a ballpark figure. By efficiency, I assume you mean height.

Answer 2

$\\ \huge \: \: \: \: \: \: ＾－＾$



Rocket Equation has made a specific impulse in setting the performance of a rocket and to use it for many uses.