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Old 10-02-2007, 04:26 PM   #1
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Country: UK
Location: London
Boat name: Athito
Boat make: Sunseeker Superhawk 34
Engines: 2x300hp Yanmar 6LP
Cruising area: Solent

Join Date: Nov 2006
Location: London
Posts: 149
Squeezing a few more knots...

I have a sunseeker Superhawk 34 (LOA 37 feet??!?).

She has 2x Yanmar 6LP-STZE rated at 315hp on Bravo III legs and "standard" props (I forget the exact pitch/size but can find this out fairly easily next time I am on board).

What mods can be made (without reducing the engine life!!) to engines, drives, props or elsewhere to squeeze a bit more speed?

I mention "elsewhere" because I have heard stuff like swapping Benett type trim tabs for the Volvo system that uses a vertical blades as opposed to horizontal sheets (with more drag) make a difference.

I have stripped as much weight as possible...

Any thoughts?
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Old 10-02-2007, 04:36 PM   #2
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You could get rid of the luxury interior and strip out the cumfy driving armchairs and put in carbon kevlar bucket seats.

Thatll be about 15mph gain

Im not helping much am I!


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Old 10-02-2007, 04:42 PM   #3
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Country: UK
Location: London
Boat name: Athito
Boat make: Sunseeker Superhawk 34
Engines: 2x300hp Yanmar 6LP
Cruising area: Solent

Join Date: Nov 2006
Location: London
Posts: 149
Quote:
Originally Posted by Temporarily Insane View Post
You could get rid of the luxury interior and strip out the cumfy driving armchairs and put in carbon kevlar bucket seats.

Thatll be about 15mph gain

Im not helping much am I!




Tried that but not too popular with the other half.......
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Old 10-02-2007, 04:51 PM   #4
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Country: uk
Location: dorset
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Boat name: aquilla .
Boat make: windy typhoon 43 , extreme24 , fourwinns 220
Engines: tamd 75p, 496 ho, 5.0gxi
Cruising area: corfu

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gold fish

look on there site they up rate motors to 350 hp not sure the bravo 3 drives
willl take the extra power ,my pal runs a 34 out of tythe marina runs 315yanmars with 26 p props bravo 3x drives runs around 45 /47 knots depending on loads

i wonded weather you would go any faster with bravo 1 drives with 4 blade props
trouble is getting on the plane it's a long wait with big props (turbo lag)
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Old 05-03-2007, 08:45 PM   #5
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Country: uk
Location: dorset
Interests: wasting money on boats
Boat name: aquilla .
Boat make: windy typhoon 43 , extreme24 , fourwinns 220
Engines: tamd 75p, 496 ho, 5.0gxi
Cruising area: corfu

Join Date: Mar 2004
Location: dorset
Posts: 556
tubo lag

hope this will sole the problem


no it's not finished yet the drive showers have got it be secured yet
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Old 05-03-2007, 09:57 PM   #6
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Country: UK
Location: London
Boat name: Athito
Boat make: Sunseeker Superhawk 34
Engines: 2x300hp Yanmar 6LP
Cruising area: Solent

Join Date: Nov 2006
Location: London
Posts: 149
Squeezing a few more knots...

ooooh looks good...

not sure if I should get showers for mine...dunno how to tell if they are getting too hot underway.
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Old 11-03-2007, 09:15 AM   #7
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Country: Germany
Location: Stuttgart
Boat name: Wild Card
Boat make: 2003 Baja 25 Outlaw SST
Engines: Mercury racing HP525EFi
Cruising area: Med, Rhine, Lake Constance

Join Date: Jan 2006
Location: Stuttgart
Posts: 30
Try moving the centre of gravity rearwards!
Met a bloke who said his Windy 37 ran faster when he had the jetski sitting on the bathing platform.
Whilst running flat out, get your guests (preferably heavy ones) to move from the front of the cabin to the back of the cockpit, and give it minute or two. You will usually (on most powerful cabin boats) see the speed increase.

If someone sits on the jetski and starts it up, you may be even faster
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Old 11-03-2007, 10:44 AM   #8
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are your props stainless ?

apart from this, I would say the only areas to reduce are weight and drag

clear out all the stuff you hardly use in the boat, sure there's loads!

run her with just 1/4 tank of fuel and maybe less/if any for water tank

use a decent hard antifoul and make sure you clean the bottom every weekend (so keep you mask and snorkel on board!)
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