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Old 12 September 2007, 10:08   #141
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Old 12 September 2007, 10:08   #142
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i have just under 50 knots in mine...but the question is ......from 40 to 50knots is a a hell of a difference, to me 40 is a great fast cruising speed with eyes wide open. surely 50 to 70 knots is just darn right scary? Can a rib handle that speed over average waters for a period of time?
Tony
That's pretty fast for a heavy boat with a deep v hull.

What prop are you using?
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Old 12 September 2007, 10:38   #143
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That's pretty fast for a heavy boat with a deep v hull.

What prop are you using?
Sorry Codders, I'm not very technical....Its a Mercury S/Steel HighFive

Tony
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Old 12 September 2007, 11:14   #144
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Quote:
Originally Posted by Tony View Post
i have just under 50 knots in mine...but the question is ......from 40 to 50knots is a a hell of a difference, to me 40 is a great fast cruising speed with eyes wide open. surely 50 to 70 knots is just darn right scary? Can a rib handle that speed over average waters for a period of time?
Tony
38kts is great but I get a sharp stabbing pain down my left side at much over 40kts and a strange noise from the seat next to me
but she does help to launch etc
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Old 12 September 2007, 11:18   #145
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38kts is great but I get a sharp stabbing pain down my left side at much over 40kts and a strange noise from the seat next to me
but she does help to launch etc
LOL...
Its so so noisy I cant hear a thing..
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Old 12 September 2007, 14:44   #146
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Sorry Codders, I'm not very technical....Its a Mercury S/Steel HighFive

Tony
What pitch are you running? I have a 4 blade prop which is pretty good but seems to peter out at higher speeds - I thought more blades were better at lower speeds???
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Old 12 September 2007, 15:09   #147
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What pitch are you running? I have a 4 blade prop which is pretty good but seems to peter out at higher speeds - I thought more blades were better at lower speeds???
I'll take a look next time i am at the pontoon..
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Old 12 September 2007, 15:45   #148
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I'll take a look next time i am at the pontoon..
Thanks - the quest for the perfect prop continues!!!
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Old 12 September 2007, 16:11   #149
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Our race RIB managed 84 mph the other day - anyone beat that?

7.4 metres Mercury 2.5 EFI (280 HP) 2 passengers (that's all it'll carry!) Tempest 23 slightly tweaked, modified gearbox, 15" offshore leg, over half fuel (at least 80 litres).
i have had mine at 85 a few times
















does it need to be in the water to count?
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Old 12 September 2007, 16:13   #150
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What pitch are you running? I have a 4 blade prop which is pretty good but seems to peter out at higher speeds - I thought more blades were better at lower speeds???
Thats been my finding ... when I went to a four from three, top end was not a lot different, all the benefit was at the bottom end, the four is a better prop IMO
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