Why do the flames from rockets seem to be proportionally as large as the rocket itself?

Question

I’m a big rocket nerd and have watched a lot of launches and every time I see one, the flames produced by the engines seem to be just as large as the size of the rocket. Is this simply a coincidence or is there a reason behind it?

In: Engineering

Answer 1

A larger rocket is usually heavier. A heavier object needs more thrust to reach escape velocity. More thrust means the engine outputs more power. That usually manifests as a larger flame!