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Old 16 August 2012, 05:11   #21
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Originally Posted by lightning View Post
In the USA though

I'll see if they ship to the UK and how much it costs....when I was buying Ferrari spares (for my old Mondial) from the USA it often cost $100 to ship a fairly small/light package. The cheaper option is a "flat rate box" but it's untracked and too small for a propeller.
Fook me, buy one from the UK then! 200 quid is small change..............

(They do ship to the UK, change the currency to euros and the shipping prices are shown and look pretty reasonable)
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Old 16 August 2012, 05:15   #22
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USPS First Class International Mail - $18.95

Sounds like that Ferarri garage were ripping you off mate !
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Old 17 August 2012, 16:45   #23
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Probably.

I complained about their postage charges and they wouldn't deal with me again after that.
$100 to ship a fairly small and light plastic panel. Plus I had to pay customs and VAT on the whole value including the postage charge.


Amazingly it was STILL cheaper than buying it from the UK.
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Old 17 August 2012, 17:17   #24
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>>>contacted Tohatsu and they said that on a 2.8m SIB the 9.8 2-stroke should be fitted with the largest pitch prop that is available.

Why would you want to do that?
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Old 22 August 2012, 13:40   #25
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They said it would give the best performance and higher top speed. Also they said it should help to reduce the cavitation I'm getting with the lower pitch one.

Anyway I've bought the higher pitch prop from Ribshop, it's actually a 9.5 (the one fitted as standard is 8.5) and I will try it out to see what difference it makes.
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Old 22 August 2012, 14:33   #26
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Prop

Try Steel Developments in Wandsworth,great service and great knowledge.
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Old 22 August 2012, 15:00   #27
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Too late now! As I've bought the prop from Tohatsu.

Thanks for the advice though, I will test both props on the water and report back when I've got the results.
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Old 11 September 2012, 11:09   #28
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Not sure what to make of this new propeller, I tested it and the SIB certainly goes well with the 9.5 pitch prop, although it went well with the 8.5 pitch one fitted as standard.

Tohatsu say that on a "light" boat I should fit the 9.5 pitch, they define "light" as in the range 100lb-500lb (45kg-226kg)

Do they mean total weight of the boat including the engine and crew?

Myself and my wife between us weigh 130kg plus the boat about 40kg including extras and the engine 26kg which is about 200kg in total.

Still in the "light" category
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Old 11 September 2012, 15:30   #29
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Have you tried trimming up the lower engine bolts with stainless steel washers this may increase your speed , you need to experiment with this but we found it to work if you need a hand give me a shout.

Ribboy
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Old 11 September 2012, 17:23   #30
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Sorry to spoil the party, but you are missing some important isues here :

1-A 280 sib is relatively small has too much hull drag, worst trying to plane with more passengers. One thing is to push, move sib, other to full plane.

2-It's s not a go for a short, large pitch issue or call the distributer as this test must be done under trial with an induction tach previously installed to check if inside safe working parameters.

3-Buy a Tiny Tach which is spark programable an set it to fire 2 spark per revolution. The rpm working factory parameters for that engine which is only 170 CC is 5000 to 6000. Stay with the prop that will give slight passing 5500 rpm, will have better hole shot than placing a prop that will give near 6 K rpm nullifying hole shot.

4-Assume you have a well inflated sib to 3.5 psi, tubes and keel, well trimed, correct transom/engine seated and passenger ballanced, correct ?

5-If nothing works out as expected including family dissapointing, you need definitely a larger sib in the 360-380 range, will work better if keeping same engine as hull will drag less and sib will slide better.

Post your pitch/rpm findings if going for a tach.

Happy Sibbing
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