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Old 20 October 2006, 07:20   #11
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I should think there is a low pressure area directly behind the transomn which causes the water to rise and that is what your prop is running in - the higher you raise the engine though the more you need things like low water pickups and surface piercing props.

What sort of props are you using Cookee???
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Old 20 October 2006, 07:41   #12
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Originally Posted by codprawn View Post
I should think there is a low pressure area directly behind the transomn which causes the water to rise and that is what your prop is running in - the higher you raise the engine though the more you need things like low water pickups and surface piercing props.

What sort of props are you using Cookee???
That's one of the reasons for moving the engine back - you can run it higher with the same gearbox.

Of course we run sportmaster gearboxes with low water pickups as standard, but we modifyu them again by extending the gearbox forward and shaping it slightly - it also gives better cornering. We actually use a Tempest for the race boat, a little thinned and tuned of course! A standard Tempest works well on the leisure boat with a 250 Verado as well! This is also on one of our custom cast brackets but a lot lower!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 20 October 2006, 08:07   #13
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On a heavier boat would the sport master still be the one to have? I see the sport master is best for boats getting over 85mph - a speed I will never see!!!
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Old 21 October 2006, 06:38   #14
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On a heavier boat would the sport master still be the one to have? I see the sport master is best for boats getting over 85mph - a speed I will never see!!!
Weight has nothing to do with it - every hull, engine and prop is different and then you have engine heights etc ...... We had problems with a CLE at around 70mph on our race boat and stuck a blow out ring on which helped - it still wasn't as fast as the Sportmaster so we went with that option - our genuine race speed with the XS200 is around 73mph and we have to have a low water pickup to get the engine high enough to do those speeds - I would therefore disagree with the 85mph comment.

Unless you are lacking in water pressure or seing (much) higher speeds than you already are then a Sportmaster or a CLE would be a waste of time.

I said before you got your boat a lifter would not be of any great benefit, and I suspect it only makes a small differance in speed (if any), and if you talk to any racer they would much rather be without them as they are just one more thing that can go wrong!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 21 October 2006, 07:21   #15
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Weight has nothing to do with it - every hull, engine and prop is different and then you have engine heights etc ...... We had problems with a CLE at around 70mph on our race boat and stuck a blow out ring on which helped - it still wasn't as fast as the Sportmaster so we went with that option - our genuine race speed with the XS200 is around 73mph and we have to have a low water pickup to get the engine high enough to do those speeds - I would therefore disagree with the 85mph comment.

Unless you are lacking in water pressure or seing (much) higher speeds than you already are then a Sportmaster or a CLE would be a waste of time.

I said before you got your boat a lifter would not be of any great benefit, and I suspect it only makes a small differance in speed (if any), and if you talk to any racer they would much rather be without them as they are just one more thing that can go wrong!

85mph is what Mercury say on their website - nowt to do with me.

http://www.mercuryracing.com/product...plications.php

Just trying to work out what gearcase would be best if I get mysefl a 300XS???

As I said before the reason I went for a lifter was because it also gave me 10" of setback to get a rear bench seat in - they didn't fit it for me though!!! There is one HUGE benefit of a lifter though - it helps a lot for me to get back into our stupid harbour - it is so shallow you wouldn't believe!!!
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