5M to 6.5M Ribs - Speed Survey

[Hugh Jardon]

engine is starting to loosen up a bit now and is 48+ knots (not fully trimmed up) now with full fuel and two on board

so once the diet starts on jan 1st I should see 50 knots next year!!

Originally Posted by Hugh Jardon

osprey vipermax 6.5 with opti 200

23 inch prop doing 46-47 knots but only revving just past 5000 rpm

usually full of fuel and 2 plus 2 kids on board

still need to try a 21 inch prop to see if that allows to rev more and perhaps push the top end up!

cruises nicely at around 35-38+ mph at around ~3.7-4k revs and is returning 4.3 miles per us gallon overall as an average

[ian parkes]

(not fully trimmed up) ??

So what happens if its fully trimmed up , Just learning here cos I thought max speed was always achieved fully trimmed up when set up properly ,

Hopin iam wrong and there is some hidden speed left in my boat

[Kernow Buoy]

Originally Posted by ian parkes

(not fully trimmed up) ??

So what happens if its fully trimmed up , Just learning here cos I thought max speed was always achieved fully trimmed up when set up properly ,

Hopin iam wrong and there is some hidden speed left in my boat

There is Ian, she'll go much faster. Just jump overboard!

[ian parkes]

Happy christmas Jeff
I will try that

[MonoMicky]

6.0M Cobra Nautique 150HP Optimax 120litres of Fuel, 2 people & a Dog
19pitch Prop 48mph (Engine Trimmed up)
Trying a 21Pitch Prop next season

[Mollers]

Originally Posted by ian parkes

(not fully trimmed up) ??

So what happens if its fully trimmed up , Just learning here cos I thought max speed was always achieved fully trimmed up when set up properly ,

Hopin iam wrong and there is some hidden speed left in my boat

I think it's something like a 'go faster' haircut?

[ian parkes]

Haircut How would you know about that ?

[Jeff]

6.0M Cobra 150HP Optimax
19" laser II 50.9 mph, 30litres of fuel, 2 people, inland flat lake
17" Revolution 4 46.5 mph 150 litres fuel, 3 people, 2 dive kit, calm Largs sea



Hoping to get up to Mull for the New Year weekend - Oban to Tobermory via west cost, Staffa and Calgary Bay > 78 miles> Just praying for good weather :-)

[ian mcconnell]

Searider 5.4 mod 90hp Yam 2stroke. 39.8 knots with 1/2tank (26ltrs) 1 on board flat calm of the thames!!!!!!

[oilrig]

tornado 5.8 135 merc, rev 4 prop, 5300 rpm, 2 up 100 ltrs liquid gold.
47 knots

[TNDB]

Great thread
Rib X 650 Suzuki DF150 with 200l half full tank, three people. All up weight ~1280kg.

with Suzuki SS 15X21 prop 6200rpm, 48mph

with Solas SS 14.75X23 prop 5800rpm 50mph

with following wind 14.75X23 prop 6000rpm 52mph

[Cookee]

BananaShark "Jet Six" (6.2m overall) Mercruiser 120 hp Diesel waterjet 30 knots, copes with a force 6 -7 in the Solent no problem, 30 knots and uses a maximum of 27 litres an hour, average consumption approximately 15 litres an hour max!

[Chris]

Osprey Viper 5.25 with Johnson 90HP 2 Stroke, 18" SS Prop, 90 litres of fuel 2 up. 35 knots average at 5350 RPM.

Chris

[Bulligmore]

Red Bay 650, two up, 200 L, Suzuki 200, 5000rpm, 42 kt. Need to change the prop to get max rpm.

[Delta Rich]

Delta 620X with 190 Inboard Diesel - 42knots

[ribit]

It would be great reading if the Shrink added some speeds and spec's for his past race boats, like last season's rib

[ciaranm]

Red Bay Stormforce 6.5, one up, 190 L, Suzuki 175, 6000rpm, 43 kt. Suzuki S/S prop. Not the fastest but it still feels great off the coast of Donegal

[Gotchidad]

Zodiac Pro 7 man (4.20m),
Suzuki DF50,
5-10L fuel (running low!),
me and my 12 year old son,
30.2knots on GPS!
Glassy calm though!


In the rough stuff 28 max (inc full fuel of 25l)!

Want e-tec Want e-tec Want e-tec Want e-tec Want e-tec Want e-tec!

[will_m]

mmm... Always thought I should be able to get afew more knts than I do.

Ribtec 585, Yam F100, 4 blade prop (not the fastest I know)
WOT @ not much over 5000rpm 29kts/30kts

Slow innit

[iainmartins]

Humber destroyer top speed at WOT anything between 42 knts and 48 (with the wind behind me)