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Old 23 March 2007, 07:17   #21
exspyrd trayd membir
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Country: Ireland
Town: inn wiliks hed
Make: Redbay 6.5
Length: 6m +
Engine: Twin Etec 90hp
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Originally Posted by jwalker View Post
There does seem to be something wrong with your figures
dats cuz heez ann irysh nobbur yew jokkstrapp

de bastuds orlwaiys ad a bitt ov trubbul werkin owt de ekschaynj rait wen yew payd dem in pownd nowtes insted ov punnts

dis bitt ov trubbul endid upp wiv yew ownly gettin 90 pense forr yorr pownd

dis iz wot yew wud corl 10% slipp

luk arfter numbir wan, downt stepp inn numbir too
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Old 23 March 2007, 07:18   #22
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Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
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Originally Posted by jwalker View Post
Feck, reading this thread, it's easy to see why. GaRfie is the brainiest bloke here!

Stick with the prop you've got. Cruise at 38-40mph.

There does seem to be something wrong with your figures, though.

4500rpm = 40mph and 4900rpm = 48mph?
Revcounter problem/set up?

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Old 23 March 2007, 07:24   #23
Country: UK - Scotland
Make: HumberOceanOffshore
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Originally Posted by The Garfish View Post
.. dis iz wot yew wud corl 10% slipp...
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Old 23 March 2007, 07:38   #24
Country: Ireland
Town: Ardmore
Boat name: Wavehopper
Make: Cobra 6.65 HD
Length: 6m +
Engine: Yam 150 hpdi
Join Date: Dec 2006
Posts: 136
With regard to 40mph@4500rpm and 48mph@4900rpm - them's the figures I'm getting. Might take her into the local Yam techie soon and get him to see if all is ok - rev counter and speedo and the standard pieces of kit for the engine .... and the speed figures seem to tally with the gps

Garf - we have de Euro over these parts. Punts, sadly, can now only be found on the water.
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Old 23 March 2007, 10:51   #25
Country: UK - England
Town: bicester, Oxford
Boat name: mach1
Make: avon SR5.4
Length: 5m +
Engine: 90hp yamaha
Join Date: Jan 2005
Posts: 177
If your engines doing 5000 rpm then dont worry, my max rpm is 5500 but mine max's out at 5000rpm. When i spoke to steel developments i was told if i changed the pitch and achived 5500rpm it would be at the sacrifice of fuel, and that top end would not improve by much.

If you are after acceleration and torque then stick to the pitch and size you currently have.

DO get a stainless if you can though, mine (titan) apparantly has more grip and a larger surface area so more thrust.. and it looks great!

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