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Deleted member 690984

I'm writing a technical manual for a starship in a science-fiction series I'm working on, I wanted to check with some folks here to make sure my calculations are correct concerning the ship's engine thrust.

The ship has a fully-loaded mass of 5 million metric tons. Using its sub-light engines, it is capable of a maximum speed of 15,000 km/s (0.05c). Assuming 1 Newton can move 1kg of mass at 1 m/s per second, and given the ship has

*two*sub-light engines, I've calculated it as requiring a thrust output of 18,750 teraNewtons of thrust to achieve 15,000 km/s at 5 million metric tons. Is this correct?

The ship also has several reaction control thrusters, 30 of them (5 fwd, 5 aft, 5 starboard, 5 port, 5 dorsal, and 5 ventral) for manoeuvring. Each thruster is actually a group of 5 exhausts, each of which can produce 5 megaNewtons of thrust (so 25 megaNewtons per thruster, essentially). I've calculated this as giving it at top possible speed using just these thrusters as 0.36 km/s (or 1,296 km/h). Is this correct?

Any help you can give would be greatly appreciated!