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Old 10 January 2009, 16:24   #31
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Country: UK - England
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Make: Delta
Length: 4m +
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This was a long time ago!. i cant remember, but i will have a look in the file at work and let you know next week!
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Old 16 January 2009, 06:20   #32
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Ok, a brief trail report for you....

5.4m Searider with Mariner 75hp 2 stroke
Max Rpm: 5600
Max Speed:35.9knts
Load 2 people plus 50ltr fuel
Prop: 18" Vengeance

5.4m Searider with Mariner 90hp 2 Stroke
Max RPM: 5400
Max Speed: 38.2knts
Load: 2 people plus 50ltr of fuel
Prop: 20" Laser 2

5.4m Searider With Mariner 75hp Optimax
Max RPM: 5500
Max Speed: 33.7
Load: 2 Plus 50ltr fuel
Prop: 18" Vengeance

75hp Optimax lifted up one hole on Transom
Max RPM: 5600
Max Speed: 34.7knts
Load 2 Plus 50ltrs fuel.
Prop: 18" Vengeance

We did try a huge amount of different props but these are the best results out of each prop trial. We never tried the 115 Opti as it was not needed. Annoyingly i cant find the 90opti results!. We also tested engine with various weights from 200kg upto 600kg.
Also worth a note the Dyno results for the above engines.

Mariner 75hp 2 stroke Dyno run @ 81.2hp
Mariner 90hp 2 stroke Dyno run @ 94.2hp
Mariner 75hp Optimax Dyno run @ 74.8hp
Mariner 90hp Optimax Dyno run @ 90.0hp

We also found that every boat is different!, and some are faster than others. We had a 5.4 Searider here a while ago with a 90hp 2 stroke on that on a good day would top 40knts.
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Old 16 January 2009, 07:57   #33
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Make: Avon 5.4
Length: 5m +
Engine: Yamaha 60FE -
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Interesting reading mate, thanks
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Old 16 January 2009, 20:38   #34
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
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Yes,very much appreciated
Very interesting that the old tech Mariners were making more than stated HP.
Looks like I'm bang on with my setup then:

Navy Sr5.4 with 85hp Yamaha 2 stroke-raised one hole
Max RPM 5300
Max speed 38.2 knots
Load-1 fat git (probably close to 1 3/4 people),100 litres fuel and 50kg+ of gear
19" Michigan Wheel Match prop
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Old 17 January 2009, 03:44   #35
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Turbodiesel, thanks for the info, if i can top 40 kts with mine then its bang on, cant wait to try it out,
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Old 17 January 2009, 04:29   #36
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Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
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That's very interesting TB.
Have been told by someone who owned my SR (couple of owners back who shall remain nameless unless he comes forward. Clue: sounds like Mavid Danning ) that they got 40+ knots out of her. But at 18stone with one ginger leg and curly teeth I'll be lucky to empty the hull
That speed was with the hull blocked off if that makes any difference.
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