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Old 14 November 2008, 12:38   #11
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Country: UK - Scotland
Town: Ardfern
Boat name: Moon Raker
Make: Humber Destroyer
Length: 5m +
Engine: Honda BF 90 D
MMSI: 235035994
Join Date: May 2006
Posts: 694
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Originally Posted by stul View Post
Well thanks for the interest shown, I see one or two have similar reading, my main concern is, if the reading at the top end 5000 + revs is correct and I can rely on this, my 75hp Mariner engine plate states 5,250 rpm
Stuart
Having switched off my engine, 1000 is indicated. If I turn the ignition back on then off, 100 is indicated. I take that to mean that my instrument over reads by 100 revs. That might be rubbish, but I don't think it's a problem.
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Old 14 November 2008, 13:11   #12
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Country: UK - England
Town: Warwickshire
Boat name: True Blue
Make: Humber ocean pro 6.3
Length: 6m +
Engine: Mercury 150 opti
Join Date: Oct 2005
Posts: 456
Quote:
Originally Posted by stul View Post
Well thanks for the interest shown, I see one or two have similar reading, my main concern is, if the reading at the top end 5000 + revs is correct and I can rely on this, my 75hp Mariner engine plate states 5,250 rpm
Stuart
I would say your rev counter is ok. It sounds like you should go up a pitch or possibly two on the prop, what prop have you got on at the moment?
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Old 15 November 2008, 12:06   #13
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Country: UK - England
Town: STOKE
Boat name: Humma
Make: Humber Destoyer 5.5
Length: 5m +
Engine: Out b 75 hp Marriner
MMSI: 235068231
Join Date: Sep 2005
Posts: 229
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Ian
I think you probally know this boat, just bought it from Jono,s friend "H"Andy seems to go well,38.6 Knots down the Menie (short burst) trimmed out, you know what its like first time out steady ,steady give it some lol.
Any way never made a note of revs when flat out.
Prop is Stainless Mercury 48-1 16988 18P
Thanks for your interest
Stuart
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Old 15 November 2008, 12:24   #14
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Country: UK - England
Town: Warwickshire
Boat name: True Blue
Make: Humber ocean pro 6.3
Length: 6m +
Engine: Mercury 150 opti
Join Date: Oct 2005
Posts: 456
Hi Stul

Yes, I do know that one. You will have great fun with that one, it is a nice rib,
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