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Old 18 March 2014, 18:14   #11
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
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Posts: 1,706
Why don't you bump that Evi/Johnson 9.9 to a 15 HP, will need : 15 HP reeed valve assembly, carb and VA gaskets to have have factory converted 15 HP. Before you guys play with prop pitches must know wot rpm numbers with an induction tach, not blindy, as this could over rev or lug engine which is bad music.

Parts may still be available, will have better thrust, hole shot with a 15 than with a 9.9.

Is a T30 a 320 Mt sib ? if so, too much hull drag to overcome fast along weight with a poor 9.9 HP engine.

Happy Boating
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Old 19 March 2014, 05:09   #12
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Country: UK - England
Town: Bovey Tracey
Make: honwave
Length: 3m +
Engine: johnson 2 stroke 9.9
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i have spoken to the prop people and they have recommended a 9.25x9 instead of the 9.5x10 i have also ordered a meter to check what revs i will be running to make sure i do not ruin the engine. I will let you know how i get one.
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Old 25 March 2014, 16:27   #13
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Go for a wot spin with you alone and light loaded sib on a flat calm no wind waters and stay with the prop pitch that delivers full or near full wot factory rpm stated for that engine. Will have good hole shot and top speeed.

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Old 01 April 2014, 14:46   #14
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Country: UK - England
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I went for a Stainless Steel prop in the end, which was a lot of money but i hope the right choice. so i have gone from a 9.5x10 to a 9.25x9. I went out today to check the RPM. The book has it up to 6000rpm, with me on my own WOT was 5800rpm. Hard to say if its any better as i was on my own and it always flew on my own. I will report back once i have been out with my mate.
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Old 01 April 2014, 17:43   #15
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With previous prop, what were the numbers at wot with you alone ? stay witht the one that delivers the nearest 6 K at wot, bear in mind that as soon you start adding weight, rpm will drop accordingly.

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Old 16 April 2014, 13:51   #16
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Country: UK - England
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Make: honwave
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The results are in and they are good. With the old prop is was a right pain trying trying to get the boat to plain with the two of us on board. Im pleased to report the new prop has made the difference. I have lost a little top end but that was to be expected. The main thing is i can now get it to plane every time with my mate and i. What i did not expect i can also get it to plain with the me the wife and my two girls on board. Thats a least two stone more than just me an my mate. All within the recommended RPM, even with just me on a calm day
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