References

"On trials the 23.1m catamaran has exceeded all expectations and is genuinely considered to be a game changer in its class.  Powered by twin MAN V12-1400 main engines the vessel achieved a sprint speed of 32 knots and a continuous service speed in excess of 29 knots at 85% engine load.  More impressive is that the vessel was able to maintain this performance, comfortably in excess of 1.25m Hs wave height in any direction.  

One utility company representative on-board for trials states that fuel efficiency at 23 knots was 35% better than a smaller, significantly less capable vessel he had on charter in Germany.

Equally impressive was the vessels load carrying capability, recording only a 2 knot loss of performance at 85% load with 15 tonnes on deck and incredibly maintaining 21 knots at 60% engine load with the same payload."

Source: http://www.cowes.co.uk/South-Boats-delivery-of-new-23m-crew-transfer-vessel.aspx