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Old 04 September 2006, 16:31   #111
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Quote:
Originally Posted by 1surfer
Gemini 5m, Mercury 90hp, 2up , 40liters, 22P Laser 11 , 5800rpm, 58mph
That's very quick!!!!!! not saying it's not so... but a quick prop calc. guestimate put's a the figures supplied at around 50mph???
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Old 04 September 2006, 19:30   #112
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Yeah, compared to other ribs this seems too fast & I cant figure out why other than the speedo being out.The Gemini weighs 220kg, motor 140kg & virtually no tube in the water trimmed up at the nose. I will have to get a GPS & see what it reads.
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Old 04 September 2006, 19:45   #113
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Anyone got speed and performance data for a Tohatsu one design 6.1M With 120ish motor?
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Old 05 September 2006, 09:08   #114
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Quote:
Originally Posted by 1surfer
Yeah, compared to other ribs this seems too fast & I cant figure out why other than the speedo being out.The Gemini weighs 220kg, motor 140kg & virtually no tube in the water trimmed up at the nose. I will have to get a GPS & see what it reads.
yes sometimes things need a little adjustment to get it into focus, my friend as I posted on page 3 has the same boat as me but a yam 130hp, instead of a 200 hp, he is running a 21p 3 blade prop with around 40ltr fuel and 2 up, on a slack tide he runs 60mph gps trimmed right out engine standard height, thats 100%, so I can only assume the s/s prop has cupping may be making a 22 and the tacho under reads maybe by a 200+ rpm taking slip closer to 10% err maybe!!!
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Old 05 September 2006, 20:30   #115
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RIBCRAFT 6.5 with a Honda 150 and about 30 gallons of fuel, two of us on board, tops out at approx 45 knots, after trimming up some. Fast enough for me!!
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Old 06 September 2006, 14:17   #116
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Andy, My 6.1 tohatsu with a 150 opti does about 53 mph, with 1/2 tanks plus aux engine, big A frame and general bits and bobs on board.

Your 120 wont be far behind.

richard
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Old 06 September 2006, 16:05   #117
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Bombard 550 yamaha 2 cycle 75hp Shell V-Power 95 octane!
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4100rpm 31-32knots with NEW Hustler 1st gen. 17" prop.
-orginal worn yamaha 17" prop 32-33knots 4800rpm
low engine trim, awerage Norwegian weather (wind and waves)
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Old 11 September 2006, 11:36   #118
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Lifeboatman

My Humber Assault 5M with a Johnson 40 2/ ,with two up reached 31.2Kts on the GPS. I was pleased with that.
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Old 17 September 2006, 03:58   #119
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zodiac 650 pro open 2 x 115 ficht

49,2 knots. 2 x 115 hp Evinrude ficht, fully trimmed. 5600 rpm, with 3-blade props. Slightly less with 4-blades.
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Old 18 September 2006, 07:55   #120
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Leeway 6.3m Mariner 135 v6 1994 laser 21" s/s 40lt fuel 2-up half-out trim flat calm fresh-water sog 51.8 mph.
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