5M to 6.5M Ribs - Speed Survey - Page 8

Pete7 · 14 December 2007, 10:52

So Bruce, lots of data, what happens next?

Pete

BogMonster · 14 December 2007, 15:06

Quote:

Originally Posted by Pete7

So Bruce, lots of data, what happens next?

Pete

Race race race

Chris · 14 December 2007, 18:19

Osprey 5.25 / Etec 115HP

90 litres fuel

1 Up

40 Knots

yorfuoj · 16 January 2008, 22:45

Tomcat 7.5metre catamaran, 120hp Mercruiser diesel, 21 prop, 34 knots 2on-board plus 80lts fuel

Tomcat 532 cat, 2x50 Tohatsu, 15" SS props, 2 on-board, 50lts gasoline, flat water, 45 knots

yorfuoj · 16 January 2008, 22:50

Focchi 510, 115 Mercury, 25" ss 5 blades prop (bad), 52 kts - 4 on-board

Focchi 550, 120 Tohatsu race + bracket, 28" ss, 65.2kts, 2 on-board

ribit · 07 March 2008, 13:45

[YOUTUBE]DQxVulis3Co[/YOUTUBE] A friend trying a few speed runs for 60MPH he only made 59.9999MPH though

thomas · 10 March 2008, 12:13

Ceasar Thunderbolt, 5.1, 2up Running a ETEC 90 with race worked prop, going of a handheld GPS and running along side another RIB gave the reading of 57.2mph but it is a cat, so having a wind tunnel does help.

I recon I have had it slightly quicker aswell on a patch of inland water with one up, but with out a GPS I cant state by how much

BassBoy · 10 March 2008, 12:27

2 adults, 180 ltrs fuel, 2 batteries, 2" Aframe, big console/screen, full safety kit, 22" S/S Suzi prop 38.2knots. (6,100 rpm)

1 adult,130ltrs...39.9knots!

(fuel consumtion=1.23nm/ltr @ 4-4,500rpm)

adams1x · 10 March 2008, 12:34

Ribeye Playtime 600 with F115 Yamaha WOT @ 5900rpm 39knts on speedo 42knts on GPS (Little tide to help!)

About half fuel and 3 people on board, small chop and 19" Prop

Cheers,
Andrew

thomas · 10 March 2008, 14:00

Quote:

Originally Posted by adams1x

Ribeye Playtime 600 with F115 Yamaha WOT @ 5900rpm 39knts on speedo 42knts on GPS (Little tide to help!)

About half fuel and 3 people on board, small chop and 19" Prop

Cheers,
Andrew

With no fuel and 1 up, witha 21 stainless on the 115, you can get 45knots out of her with a small following sea state, with the engine jacked up on sea trails and prop testing I have had 46 knots according to the Yamaha gauges.

Good little boat...

adams1x · 10 March 2008, 22:40

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!! :-)

thomas · 11 March 2008, 09:16

you know what I mean, 1 bar flashing on the way back in to dartmouth...

adams1x · 11 March 2008, 12:23

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!

ryza00 · 09 July 2008, 14:57

Avon 5.8 open adventure F150 with standard prop 4 people 100ltres of fuel 43 knots

JakeT · 01 March 2016, 14:50

Quote:

Originally Posted by oogopach

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?

willk · 01 March 2016, 16:38

A1an · 01 March 2016, 17:20

Hahaha, that's quality!

brucehawsker · 21 August 2018, 05:04

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.

Last Tango · 21 August 2018, 12:23

Quote:

Originally Posted by brucehawsker

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.

xpertski · 21 August 2018, 22:44

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