I was thinking about stellar engines. One type of stellar engine is the Caplan thruster, which concentrates the star's light onto the star's surface to create beams of solar wind, which are collected by Bussard ramjets to propel the star.
I would like to know how efficient and fast seven Caplan thrusters would be at pushing the Sun. People have talked about building one, but how much less efficient would each one be (due to the angle of the six 'outside' thrusters) if we built seven? I'm thinking of an arrangement with six thrusters at the corners of a hexagon plus one in the middle, all pointing their hydrogen beams at the same spot. I would like to know this, but I don't even know the thrust or size of one thruster, let alone how much this arrangement would decrease efficiency.
Sorry for the order in which I gave out details in this question.