Interesting Boat Concept ...

I don't think it's new. I recall reading an article about some Australian built recreational boats with a similar hull.

Problem is it's difficult to fit a decent full beam Master Cabin no matter what size of hull.
 
Hugin said:
I don't think it's new. I recall reading an article about some Australian built recreational boats with a similar hull.

Problem is it's difficult to fit a decent full beam Master Cabin no matter what size of hull.
Click to expand...

I think that's the problem with cats: but you get the actual hull spaces to put a bunk forward and corresponding heads in the aft space .

Have a look at the amazing spec sheet:

[TABLE="width: 100%"]
[TR]
[TD]Type[/TD]
[TD="width: 380"]Aluminium Catamaran[/TD]
[/TR]
[TR]
[TD="width: 143"]Length OA[/TD]
[TD="width: 380"]10m[/TD]
[/TR]
[TR]
[TD="width: 143"]Beam MLD[/TD]
[TD="width: 380"]4.6m[/TD]
[/TR]
[TR]
[TD="width: 143"]Speed[/TD]
[TD="width: 380"]12 Knots[/TD]
[/TR]
[TR]
[TD="width: 143"]Main Engine[/TD]
[TD="width: 380"]2 x Volvo Penta model D4 180 Engine rated at 180 hp @ 2800 RPM[/TD]
[/TR]
[TR]
[TD="width: 143"]Gearbox[/TD]
[TD="width: 380"]2 x ZF 63A Gearboxes 2.52 : 1 reduction[/TD]
[/TR]
[TR]
[TD="width: 143"]Propeller[/TD]
[TD="width: 380"]26″ x 21″ x 4 Blade[/TD]
[/TR]
[TR]
[TD="width: 143"]Hull Material[/TD]
[TD="width: 380"]Aluminium[/TD]
[/TR]
[TR]
[TD="width: 143"]Class[/TD]
[TD="width: 380"]Irish Flag Authority[/TD]
[/TR]
[TR]
[TD="width: 143"]Delivery[/TD]
[TD="width: 380"]2008[/TD]
[/TR]
[TR]
[TD="width: 143"]Owner[/TD]
[TD="width: 380"]Sinbad Marine Services Ltd[/TD]
[/TR]
[TR]
[TD="width: 143"]Home Port[/TD]
[TD="width: 380"]Killybegs Ireland[/TD]
[/TR]
[/TABLE]



The vessel was Sea Trialed on the 8th February 2008 achieving a top speed of 14.8 knots & Bollard pull of 3 Ton.
For any further information please contact Mooney Boats Ltd.

15kts/11 tons on twin 180 HP is very impressive... :)
 
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The Prout Panther had a similar configuration many years ago.

Other hull types were found to be far more efficient for power catamarans.
 
JimBrown said:
The Prout Panther had a similar configuration many years ago.

Other hull types were found to be far more efficient for power catamarans.
Click to expand...

I was wondering about the hull form too, its seems to be a very crude square shape with cut back bow section...

This larger 16 mtr version is coded for 200 miles off-shore with twin 500 hp.

 
Can't help thinking it needs bigger spray rails, I think a lot of horsepower is being used to throw water out sideways judging by the pics that's wasted energy which should be used to lift the hulls a bit higher for less wetted area.
 
spannerman said:
Can't help thinking it needs bigger spray rails, I think a lot of horsepower is being used to throw water out sideways judging by the pics that's wasted energy which should be used to lift the hulls a bit higher for less wetted area.
Click to expand...

I would totally agree with you, but the performance numbers speak differently: 10 mtr/11 tons / 180hp twin/15 kts.

Here's a better photo of a steel version of the same hull; on its side, outside of hull facing upwards:

 
Last edited:
rustybarge said:
How can such a crude shape be so efficient...?
Click to expand...

To be honest I don't think the data suggest particular noteworthy efficiency

According to the calculator below a 12 tons semi-displacement boat with a waterline of 9.8 m. would need 250 hp to reach 15 knots..... 360hp should be enough for 18.2 knots.

http://www.psychosnail.com/boatspeed/boatspeedcalculator

To be fair I don't know how precise it is for 15 knots speeds, but I have found it fairly precise for shaft driven boats with top speeds in the 20-30 knots range when punching in actual known figures. For example it calculates a theoretical speed of 29.6 knots for a 2x260hp Nimbus 365 Coupe, whereas it has reached 30.2 knots on actual tests.

The shaft driven Marex 370 ACC reaches 31.2 knots at a weight of 7.5 tons with a single 435 hp VP D6. That is impressive! According to the calculator it should top out at 26.2 knots for that weight, so there are 5 knots for free if you own one of these :)
 
Hugin said:
To be honest I don't think the data suggest particular noteworthy efficiency

According to the calculator below a 12 tons semi-displacement boat with a waterline of 9.8 m. would need 250 hp to reach 15 knots..... 360hp should be enough for 18.2 knots.

http://www.psychosnail.com/boatspeed/boatspeedcalculator

To be fair I don't know how precise it is for 15 knots speeds, but I have found it fairly precise for shaft driven boats with top speeds in the 20-30 knots range when punching in actual known figures. For example it calculates a theoretical speed of 29.6 knots for a 2x260hp Nimbus 365 Coupe, whereas it has reached 30.2 knots on actual tests.

The shaft driven Marex 370 ACC reaches 31.2 knots at a weight of 7.5 tons with a single 435 hp VP D6. That is impressive! According to the calculator it should top out at 26.2 knots for that weight, so there are 5 knots for free if you own one of these :)
Click to expand...


There seem to be lots of variables in hull forms and power requirements, some claims make interesting reading like the super slim monohulls, but a rule if thumb seems to be about 50/ ton for a s/d boat for a 15 kts cruise.

The Cat trawlers are about 30hp/ton, or about 40% more econmomical.


Perhaps you remember Rob71 was building a steel planing boat last year, put on hold because of family health probs: I think the design weight was 20 tons on a 50' length, and the engines were going to be at least twin 600hp.

Steel and planing don't really go together, unless you own an oil well!

So in was wondering if cat and steel go together?

Here's an Australian steel Cat at the magic 7 tons, 10 mtrs, but they've had to use 3_mm plate.

Do you think 3mm is too thin to use in salt water?

Photo: http://www.bodenboatplans.com/popup_image.php?pID=23&image=0&osCsid=pmk71ma4ihfu83m7da8b4prkg2


At first we thought that a 9 metre steel catamaran would not be practical. A preliminary design established that providing it was built in 3mm plate,with fabricated frames and tunnel beams,a satisfactory design was possible. The hulls are deep to carry the additional weight and the craft is designed to run at displacement speed with initial estimates indicating a top speed of 14 knots and a very economical cruising speed of 10 knots. Particular attention has been given to the machinery installation with the hull aft designed to accommodate the propellers, reduce draught and enable the catamaran to sit on the bottom. The original craft was designed in 2002 for use cruising the Greek islands.
[TABLE="width: 289, align: left"]
[TR]
[TD]Length[/TD]
[TD]9.0 m[/TD]
[/TR]
[TR]
[TD] Displacement[/TD]
[TD]6500-7500 kg[/TD]
[/TR]
[TR]
[TD] Material[/TD]
[TD]Steel[/TD]
[/TR]
[TR]
[TD] Hull Draft[/TD]
[TD]0.85 m[/TD]
[/TR]
[TR]
[TD] LWL[/TD]
[TD]7.9 m[/TD]
[/TR]
[TR]
[TD] Hull Weight[/TD]
[TD]4500 kg steel[/TD]
[/TR]
[TR]
[TD] Beam[/TD]
[TD]3.8 m[/TD]
[/TR]
[TR]
[TD] Max Speed[/TD]
[TD]12 kn[/TD]
[/TR]
[TR]
[TD] Motor capacity[/TD]
[TD]2 x 60 hp[/TD]
[/TR]
[TR]
[TD] Fuel Type[/TD]
[TD]Diesel[/TD]
[/TR]
[TR]
[TD] Fuel Capacity[/TD]
[TD]700 litres[/TD]
[/TR]
[/TABLE]
 
Last edited:
a 40 ton lagoon power 630 requires 230 ish bhp per engin to reach 15 knots (300hp per engine gives a top speed of 17 knots).
 
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