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Old 10 March 2008, 17:40   #151
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Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
Hi, Thanks for the comments, I have not had the boat long but am very pleased :-) Interested that you got 40+ knots with no fuel, I knew the F115 was good on fuel economy but that is impressive!! :-)
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Old 11 March 2008, 04:16   #152
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Country: UK - England
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Make: RIBTEC 655
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you know what I mean, 1 bar flashing on the way back in to dartmouth...
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Old 11 March 2008, 07:23   #153
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Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
Indeedy, lyme bay with 1 bar flashing is not always the best place to be! Dartmouth is stunning though, one of my fav places, just a shame it is quite a long way from Hayling Island!
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Old 09 July 2008, 09:57   #154
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Country: UK - Scotland
Town: Gourock
Boat name: 5.8 Open Adventure
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Oct 2007
Posts: 25
Avon 5.8 open adventure F150 with standard prop 4 people 100ltres of fuel 43 knots
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Old 01 March 2016, 09:50   #155
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Country: UK - England
Town: Manchester, UK
Boat name: Majic
Make: Ribtec
Length: 6m +
Engine: Mercury 200
Join Date: Aug 2010
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What Prop?

Quote:
Originally Posted by oogopach View Post
Solent 6.5mtr Etec 200HO.

2 up force 3 full fuel 200ltrs engine at half trim wot 52knts

One up flat clam 200ltrs fuel 59 knts fully trimmed just prop in water... scary stuff!

Both two way and both on GPS
I get 47kts WOT at 5500rpm on a Ribtec 645 with a Mercury 200 running a 21" Laser II prop. 100-150 litres fuel, 2 up, trimmed out, flat calm. What prop size are you using as this seems very fast to me. Does anyone use a 23" prop on a 6.5 with 200HP?
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Old 01 March 2016, 11:38   #156
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Make: Redbay Boats
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RIBase
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Old 01 March 2016, 12:20   #157
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Make: Humber Destroyer
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Hahaha, that's quality!
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Old 21 August 2018, 00:04   #158
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Country: UK - England
Town: Aylesbury/Lymington
Boat name: Farfetched
Make: Solent
Length: 6m +
Engine: 150hp Optimax
MMSI: 235021048
Join Date: Apr 2004
Posts: 915
6.5 Speed Survey

Well, for all sorts of reasons, work, having fun on the water, forgetfulness, this thread got forgotten by me. Sorry.

Now with loads of data I have honed in on 6.5 nominal boats with outboards of nominal 150.

There are two outliers which are a 6.5 Tornado (not a light boat) with a 150 optimax quoting 46, and a 6.5 Ribcraft (not a light boat again) with a Honda quoting 45. I suspect those are actually mph or 40 or 39 knots....

Everyone else clusters at 42-43.5 knots.

Of specific interest are a 650 Rib-X which gains 2 knots over the pack to 45 with 23 pitch, and Ribcraft with a Suzi 175, again with 23 pitch but with a 175 which again gains 2 knots to 45.

I would be very interested to hear from people with a 6.5 with any revisions to their earlier submissions, anyone with a 175 in particular, and anyone running a 23 pitch prop.
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Old 21 August 2018, 07:23   #159
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Country: UK - Scotland
Town: Denny
Boat name: Hebridean Storm
Make: Coastline
Length: 6m +
Engine: Mariner F150
MMSI: 235107505
Join Date: Mar 2013
Posts: 1,186
Quote:
Originally Posted by brucehawsker View Post
Well, for all sorts of reasons, work, having fun on the water, forgetfulness, this thread got forgotten by me. Sorry.

Now with loads of data I have honed in on 6.5 nominal boats with outboards of nominal 150.

There are two outliers which are a 6.5 Tornado (not a light boat) with a 150 optimax quoting 46, and a 6.5 Ribcraft (not a light boat again) with a Honda quoting 45. I suspect those are actually mph or 40 or 39 knots....

Everyone else clusters at 42-43.5 knots.

Of specific interest are a 650 Rib-X which gains 2 knots over the pack to 45 with 23 pitch, and Ribcraft with a Suzi 175, again with 23 pitch but with a 175 which again gains 2 knots to 45.

I would be very interested to hear from people with a 6.5 with any revisions to their earlier submissions, anyone with a 175 in particular, and anyone running a 23 pitch prop.
6.5 Coastline..two up approx 80ltrs. 43.7 kn @ 5650 rpm Mariner F150, 19" Tempest plus.
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Old 21 August 2018, 17:44   #160
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Country: UK - England
Town: swansea
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 178
Our 6.3m Humber Ocean Pro used to get 39 knots with a 140 Suzuki about 10 years ago, now we are getting around 33-35 knots with two up. I’m thinking the hull needs a polish, maybe some horses have escaped out of the engine which is now 14 years old, 21” aluminium prop.

Jonny
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