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Old 19 July 2005, 17:24   #11
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Quote:
Originally Posted by qcamel
The jack plate looks rather clever!!!!

I have a busy daya ahead, avoiding all work responsibilities and trying to resolve my boat issue, the perfect day...

Ollie
Hi Ollie,

I would second the comments about propeller vents. If you propeller has vents in the hub near the leading edges of the blades then block them up with some plastic plugs - about 50p each from your friendly Mercury dealer.

I found that my Laser 2 performed much better once plugged.
The Vengence seemed to cavitate a lot - but no holes to plug.
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Old 19 July 2005, 17:40   #12
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I'm running a Optimax 225,had the same problem no grip,changed to a four blade revolution prop and it cured the problem.
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Old 19 July 2005, 17:58   #13
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No luck today with Scorpion, will try again tomorrow.

Already running a stainless steel 4 blade so not sure thats the solution.

More news to follow

Ollie
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Old 19 July 2005, 18:42   #14
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Ollie, it wouldn't be difficult to have a bracket fabricated to bolt onto the original holes which set the engine back a little and allowed the repositioning of the engine mounting holes.
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Old 19 July 2005, 21:55   #15
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http://www.cook-mfg.com/

Have a look at these - will give you some ideas - I have gone for a 10" setback jack for my 225.
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Old 20 July 2005, 06:20   #16
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Had a good chat with Graham at Scorpion today. Stepped Hulls will always suffer a little because by nature they are putting air bubbles into the prop area, however my Stepped Boat was an early one and they have learnt and continued to develop since then. He put me in touch with Steel Developments in London who now produce props with 'cupping' on the tips of the blades this has pretty much solved the problem on boats produced now. I have ordered one and will let you know how it performs.

Interesting point from Graham was that when he first put my boat in the water the only way to get her to plane was by putting the trim tab setting to full down. Amazing how much inpact the current prop has made.
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Old 20 July 2005, 08:46   #17
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Quote:
Originally Posted by qcamel
Had a good chat with Graham at Scorpion today. Stepped Hulls will always suffer a little because by nature they are putting air bubbles into the prop area, however my Stepped Boat was an early one and they have learnt and continued to develop since then. He put me in touch with Steel Developments in London who now produce props with 'cupping' on the tips of the blades this has pretty much solved the problem on boats produced now. I have ordered one and will let you know how it performs.

Interesting point from Graham was that when he first put my boat in the water the only way to get her to plane was by putting the trim tab setting to full down. Amazing how much inpact the current prop has made.
If this is the case with a stepped hull then I would have thought a bracket which moves the engine further back would be ideal - the theory is the prop is operating in much cleaner water.
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Old 20 July 2005, 09:40   #18
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...a bracket which moves the engine further back would be ideal - the theory is the prop is operating in much cleaner water.
A perfect theory for a hull travelling at precisely zero knots!
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Old 20 July 2005, 10:35   #19
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A perfect theory for a hull travelling at precisely zero knots!
So it is speed dependent then????
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Old 20 July 2005, 11:07   #20
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I think the point being made is that if you move the engine backward to find cleaner water then you would need to move it back more than a couple of inches to have any effect...
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