25 February 2016, Latest Launch , 1 comment

12m displacement cat finally launched

Our Roger Hill designed 12 m displacement cat has had its first outing on theTauranga Harbour.

Driven by twin 170hp Hyundai diesels on conventional shafts, the craft notched up a top speed of 24 knots. The displacement mode created a strange sensation for those not used to a boat resisting the normal habit of wanting to plane when the power goes on. Its sharp bow cut effortlessly and extremely smoothly through the largest waves found on the day  – unfortunately just under a metre in the harbour entrance.

Latest performance data. Half fuel, full water tanks but minimal personal gear loading. Sea conditions – half metre chop.

  • 8 knots, 9.6 litres per hour total both engines
  • 11 knots, 16 litres per hour total
  • 15 knots, 26.6 litres per hour total
  • 20 knots, 43 litres per hour total
  • 24 knots, 70 litres per hour total.

For the 60 nautical mile trip from Auckland to Great Barrier Island or Tauranga to Great Mercury Island, cruising at 15 knots would take 4 hours and use 106.4 litres of diesel at today’s cost of about $81!

At 20 knots it would be a 3 hour trip at a cost of $100. (Diesel at $0.77 per litre). Please note sea conditions and boat loading will influence this data.

One comment so far

  1. jason thrupp,

    Looks great Kim!
    More photos somewhere?
    Are you keeping it for yourself?

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