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Old 22 May 2011, 21:54   #1
zip
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how fast is your rib?

took my 14 footer out in slightly choopy water and got up to 36 mph w/Yamaha 50 hp at 5300 rpm.

seemed really scary. felt like boat was gonna flip over. maybe if it was calm it wouldn't have felt so spooky, but it did feel like i was going pretty fast.
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Old 22 May 2011, 22:21   #2
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In calm water, my 21' Ribcraft, powered by a 150 hp honda, tops of at 43 knots, or 49.5 mph. At the speed you were at, it sounds like the boat was chine walking, which can be pretty scarey. There are a number of threads in the rib forums on chine walking.

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Old 22 May 2011, 22:24   #3
zip
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chine walking?

Bill,

it was kinda wobbling from side to side. is that chine walking?

i've run it WOT on calm waters, and it is fine.
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Old 23 May 2011, 05:33   #4
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Yes Sir!

That is exactly what happened. Slow down, that can go from scary to downright dangerous in a spit second! Be safe, have fun!
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Old 23 May 2011, 05:38   #5
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Valiant 5.20M with 70Hp Suzuki - 44 knots - Think thats water speed not ground speed?
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Old 23 May 2011, 06:48   #6
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Country: UK - England
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Make: Ribcraft 585/Wetline
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Ribcraft 585 with a four stroke Honda 90 will do 36MPH on the flat with a crew of 2.

This boat weighs more than a small planet. When I cut some holes in the console they were over 8mm thick. It is a nice solid boat and handles the sea better than me
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Old 23 May 2011, 07:10   #7
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Very fast.....
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Old 23 May 2011, 07:28   #8
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Quote:
Originally Posted by willfinch36 View Post
Valiant 5.20M with 70Hp Suzuki - 44 knots - Think thats water speed not ground speed?
Wow! 48mph with only 70hp. Impressive
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Old 23 May 2011, 07:44   #9
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Valiant 5.20M with 70Hp Suzuki - 44 knots - Think thats water speed not ground speed?
How were you measuring this?
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Old 23 May 2011, 08:08   #10
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Fishermen and their catch size and rib owners and speed have much in common.

Welcome to fibnet
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Old 23 May 2011, 08:21   #11
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Ribcraft 5.3 with Suzuki DF90, one up, low on fuel, not much kit...41.2mph measured with a Garmin 5xxx. Had a bit of tide with me
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Old 23 May 2011, 09:18   #12
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Gets out to the blue water fast. 48 MPH on GPS. Yanmar 315HP turbo Diesel.
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Old 23 May 2011, 10:28   #13
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33mph at the min out of a 1992 50hp mariner and zodiac pro 7
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Old 23 May 2011, 10:46   #14
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Valiant DR 490 circa 28-30 kn. with E tec 60 hp
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Old 23 May 2011, 14:20   #15
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Ribcraft 6.8 with 225 ETec: WOT - 47 knots (54mph), cruise - 38 kts (44mph). Best deceleration figure - 7kts to zero, instantly, several times, after running aground or hitting rocks.
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Old 23 May 2011, 14:42   #16
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Os'prey Vipermax 7m -250Etec, best 49.1 knts. Consistantly 47 running a 23P 4 bladed Cyclone, propped for grunt and grip, moreso than top speed.
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Old 23 May 2011, 15:15   #17
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I asked the question of Ribcraft themselves and the reply I got was that the max design speed for the 585 was 45 knts. This of course depended on all the usual variencies. I have with two up, no gear. calm had it at 43knts very nice but only for the best of conditions as youra@se is barely in the water!!

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Old 23 May 2011, 22:32   #18
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Polaris 17.5' aluminum RIB (fairly beamy), Yam F115; will touch 40 MPH with just me and dive gear; normally loaded (2 or 3 divers and gear) top is generally about 36 or 37 MPH. 5 or 6 divers drags it down to just over 30.

I usually run with a full or near-full load of fuel, which I think is 30 gallons. I also have probably a couple of hundred lbs of miscellaneous stuff on-board (dive spares, tool kit, extra dive lights, spare lead, etc.)

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Old 23 May 2011, 23:28   #19
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Faster than a canoe...

Never can remember exactly what the old Raymarine says regarding speed, for me its about the ride which is always enjoyable no matter what speed I'm traveling at... I'd hazard a guess at between 50 and 55 knots top end.
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Old 24 May 2011, 04:14   #20
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Quote:
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How were you measuring this?
with my eagle chart plotter/fish finder/gps?

Have I done something wrong? lol
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