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Old 01 December 2011, 10:49   #121
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Saw 44, didn't see the units, didn't see the boat didn't see the engine.
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Old 01 December 2011, 12:12   #122
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Well I paused the vid several times before I got it lads but it was deffo 44.5 kts!
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Old 01 December 2011, 12:53   #123
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Originally Posted by willk View Post
Bjoern

I

48 knots on a SR4 with a Yammie 50 is Guinness Book of Records material - the upper end reported for this rig (on here) is below 40kts, mid 30's being typical. There's not much SR4 left in the water at 35kts. I guess that explains some of the replies you've got/are going to get.
Fully agree.. only mono hull I know that is going close to 50 with a standard engine is the V-50 offshore boats. They have nose-cones for cooling water, prop axle is only 20mm bellow the bottom, and they use racing chopper or cleaver propellers. Not even all of these boat do 48...

here one

I don't say its not possible to do 48 in a SR4, i just have hard to believe its possible with a standard 50 outboard, not even with a racing prop on, as aerodynamics is so much poorer than in the V-50 boats. Engine might be tuned or then the output is much more than 50.

As far as i know 2 strokes Yamies have not been sold in USA for a long time, at least not for private use?
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Old 01 December 2011, 13:44   #124
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many things are possible but i think u have got more chance of fineding a hand break on a conoe
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Old 03 December 2011, 06:24   #125
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Originally Posted by spartacus

Just what I thought.

1 boat - okay, but that's it
2 boats - where am I supposed to park the bl**dy car?
3 boats - your dinner's in the dog (again)
4 boats - someone from the council called to see if you were trading?
5 boats - someone from the Royal Navy called...
6 boats - see you in court!
In all fairness 3 are allocated one each to my boys. But then there are a few hardboats which we will not talk about.
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Old 03 December 2011, 06:26   #126
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Love this thread and want to contribute but I have never been concerned with the actual speed number. I just love the feeling of speed, but in the interests of research I will be quantifying the fleet.

Over the next few weeks plan on taking all the family's RIB's and SIB out for a run with the iPhone gps app. Of course that depends on weather and other commitments.

Anybody wants to take a guess beforehand, you are most welcome.

Zodiac AR340 with a beat up 2001 Yamaha 20hp 2 stroke. Prop came with outboard and i think is 9 7/8 x 11 1/8.

Dockitjet 5.6m with 1996 200hp Suzuki in excellent condition. Has a 3 blade 25 inch prop at the moment. Only ever been run once and bad chime walk at 3000rpm but will raise the motor, put a 4 blader on and some weight in the front to see what will happen.

Ribtec 890SX with twin Yamaha diesel sterndrives 240hp ME421 sti's. Currently had standard Yamaha 21 inch props.

3.2 m no name air floor, inflatable keel Chinese SIB with Mariner 1989 15hp. Not sure of the prop, the only thing i can see on it is A122105P.

Redback Stinger 2.9m rib with Mariner 9.9, about 1990. No idea of the prop.

Zodiac 470 with (2000?) Mercury 50hp. Has a stainless 18 pitch prop.
Okay, the Ribtec 890SX with twin Yamaha diesel sterndrives 240hp ME421 sti's hit 58mph / 78kmh today.
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Old 03 December 2011, 06:58   #127
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That looks impressive - was that 44 point something?
The biggest number in the video seemed to be 45.3; but that was only momentarily so it might be partially due to GPS error rather than absolute speed; it was consistently reading > 43...
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Was there any current and did you run the other way as well?
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Old 13 January 2012, 23:39   #128
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My wife and I hit 72mph with ours, a Caribe MVP-10, mercury 15hp 2 stroke. Its usually alot slower when Im not ripping up Rt. 95 with it dragging behind the truck.
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Old 21 January 2012, 09:36   #129
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WOT 49+ knots in calm seas, zero chine walk what-so-ever. Ballistic 7.8 with 2x150 hp Evinrude Ficht RAM, five tanks of diving gear and 400 liters of gas.

If the sea conditions allow it, my "cruise" speed is 45, just for the fun. Sometimes 30-40 knots with more waves and a hard ride. However, unless I manage to ride the tops of the waves I have to drop to a slow 20.
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Old 23 January 2012, 10:14   #130
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WOT 49+ knots in calm seas, zero chine walk what-so-ever. Ballistic 7.8 with 2x150 hp Evinrude Ficht RAM, five tanks of diving gear and 400 liters of gas.
Out of curiosity, what's your fuel consumption at that speed?

jky
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