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Old 10 November 2007, 19:31   #11
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Only down Hill and with the wind behind
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Old 10 November 2007, 20:14   #12
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I wouldn't call that cruising though. I would say about 30 minutes at least constant running would be cruising ! Maybe even more.
Nah. It's just a throttle range that's quick enough but not thirsty(in perspective!). You can do that for 5 minutes.

As for cruising at 40 knots, some of them do (coming along the Solent with Bedajim, the Jackeens and Leeway was bloody expensive trying to keep up!)
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Old 10 November 2007, 20:25   #13
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Nah. It's just a throttle range that's quick enough but not thirsty(in perspective!). You can do that for 5 minutes.

As for cruising at 40 knots, some of them do (coming along the Solent with Bedajim, the Jackeens and Leeway was bloody expensive trying to keep up!)
Trouble is, 40 knotts is cruising speed for the Jackeens and Leeway
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Old 10 November 2007, 21:19   #14
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Trouble is, 40 knotts is cruising speed for the Jackeens and Leeway
I get the impression that 40 knots is Lee's stall speed....that's when his hull finally drops back into the water
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Old 11 November 2007, 05:03   #15
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Let's define what 'cruising' speed is, as I tried
to with the member that informed me that he and other Solenteers 'cruised' at 40 knts. Cruising, in my view is passage making over a distance where a reasonable ratio between speed and economy is to be acheived. This is not a flat-out blast for 4 or 5 miles with a bunch of mates or even a dash around the island showing off one's greater HP.
We 'cruise' to the Scillies, from Falmouth this is a 200Nm round trip. Fuel on the islands is 1.45/ltr so we carry enough not to have to buy more over there. Blasting out from Falmouth at 40knts would be crazy, it would get us there a bit sooner and double the fuel bill.Our optimum cruise speed is around 25knts which relates to 4100-4200 rpm on my boat.
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Old 11 November 2007, 05:45   #16
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With the added weight aux+fuel on the back I seem to get the best fuel figures at 28 29 knots but don't normally look at the revs more interested in water pressure etc
Go more for comfort in the conditions and staying in a group if out with others, I would think 3500 to 4500 rpm but don't tend to let it sit at constant revs

40kts ruins the wife hair so that's a no no
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Old 11 November 2007, 05:49   #17
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With the added weight aux+fuel on the back I seem to get the best fuel figures at 28 29 knots but don't normally look at the revs more interested in water pressure etc
Go more for comfort in the conditions and staying in a group if out with others, I would think 3500 to 4500 rpm but don't tend to let it sit at constant revs

40kts ruins the wife hair so that's a no no
My figures relate only to flat water.
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Old 12 November 2007, 08:09   #18
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I ran at 5000 on 10 June when we went to the Dancing Ledge and I surprisingly got a good fuel consumption and didn't seem to be caning it.
that was a fun trip wasnt it if a bit of a long day for the little kids being over 90 miles.

if we knew you were only at 5k revs we could have picked up the pace a bit......just kidding
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Old 12 November 2007, 13:11   #19
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with common sense like that..

Mollers
with common sense like that - I am surprised we have not yet cruised in copmany.
For us (like you) it is making big distances safely without using excessive fuel.

Most RIBs, I guess, are only run for for short periods - but when you are doing 100to 150Nm per day it makes a big difference.

Also comfort wise - why speed and be uncomfortable.
The exception to this (there is always a get out clause) is when you know the weather is deteriating fast and time then is more critical than absolute consumption.
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Old 12 November 2007, 15:29   #20
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that was a fun trip wasnt it if a bit of a long day for the little kids being over 90 miles.

if we knew you were only at 5k revs we could have picked up the pace a bit......just kidding
Biggles-Jardon, Jardon-Biggles, Jiggles- Bardon, Jargles-Biggon. Anyone ever seen them both at the same time?
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