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Hi guys

I know that the warp is the main way to get around the galaxy, what I'm trying to get my head around is the description of the speed which is referenced on sites such as 40k wiki which will say 4.3 gravities maximum sustainable acceleration.

http://warhammer40k.wikia.com/wiki/Turbulent-class_Heavy_Frigate

Any help on this is appreciated

There's a defined rate of acceleration per "gravity", which tells you how many meters per second, per second, that a given ship can move at. Because the ship operates in space, there's no upper limit (theoretically) to how fast it can get going, it just takes more time to get up to super high speeds.

4.3gms is, incidentally, 42 meters per second, per second.