I made the original model of this craft.
I ran her on 2 x 545's and a 6 volt 10 Ah battery with 3 blade fast props from Prop Shop, she was reasonably fast but would last for well over an hour.
She is now in Beale Park Museum.
The original boats werent that fast.
Original engines were MAN medium speed diesels, these were changed for Rolls Royce Diesels, then finally Volvo Pentas (with a prop change to 4 blades).
On the last installation these boats struggled to make 21 knots.
The Police boats were powered by Ford Sabre Turbocharged engines which were a bit quicker, but didnt like running slowly, then being opened up. This tended to blow the turbo.
There are also some Customs boats based on this hull with Cummings Engines (I think) which did perform well.
The hull isnt a fully planing hull, but a semi-displacement hull with spray rails, Trim tabs were fitted to keep the bow down as they did have a tendancy to lift, but not actually plane.
But I must admit they do look good on the plane.
Bob