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Old 23 July 2005, 18:33   #31
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Lot of this about from you tonight, Jeff....
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Old 23 July 2005, 18:34   #32
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I think you've lost. Bye.
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Old 23 July 2005, 18:35   #33
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Old 23 July 2005, 18:38   #34
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It seems to me that Richard said in his original post summat like: "if your tube is in the water at speed, you will have very poor high speed handling"
Which is pretty true.

The Argument, sorry, discussion, seems to have been swung around to another angle.

I agree, if at low speed, having ya stableizers on might help with roll stability, but once you're travelling quickly (original statement), a combination of the dynamics of the hull design (a good one that is) and a good driver, who anticipates and corrects for the roll brought on by a beam, or 3/4 sea is fine.

Dragging ya fenders about at speed aint good, they're too bouncy.

A good, if rather extreme example is how easily some of the race ribs with bigger toobs have barrel rolled in a straight line, bouncing from toob to toob.

like this:

http://www.jfvideo.co.uk/gallery/Gen...ett_roll_small

or this:
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Old 23 July 2005, 20:11   #35
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Yes, I watched the vid of that roll and it certainly went over very easily. Do you reckon it was just the bounce from the tubes?
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Old 23 July 2005, 20:39   #36
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Seawolf Ribs

I thought the twin Yanmar model with twin Jets represented good value. Any Chance of a trial when I get back from the Norf C. Also whats the smallest of your bots you could put a diesel jet combination on?
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Old 24 July 2005, 04:37   #37
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Originally Posted by jwalker
Yes, I watched the vid of that roll and it certainly went over very easily. Do you reckon it was just the bounce from the tubes?
No, they're running close to 100mph, crossing a diagonal wake, a dangerous manoeuvre in any boat, but the tubes certainly seem to add to the 'pendulum effect', rather than damp it out.


Many of the 'pure race' type ribs have relatively small diameter tubes, these Buzzi 36's had quite large ones, and I know of 3 instances of them rolling in this way (whilst running straight, rather than 'in a turn', the latter is understandably more common)'

The later generation of that boat from Buzzi is 'tubeless'.
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Old 24 July 2005, 05:34   #38
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You BIG boys are fine with your 200hp+/40 knotts+ RIBs but give a thought to us smaller guys.

In a head sea, it's all about how much punishment us humans can take before we back off.

In anything but the slightest following sea I have to back right off and as JW said, cruise at 5knotts faster than the wave. I've tried to go flat out as everyone suggests and it seems to work over some waves and not over others, I had a nasty stuff and ended up with a wheel shaped bruise on my chest. I just won't do it anymore, too dangerous! This test was carried out when I had my Yam 80 on the back, with the extra weight of the Merc and a deck locker on the stern the following wave handling has improved tremendously, but I'm yet to sample the type of sea's I conducted my tests in.

As for the tubes in water......I think the boat would sink if my tubes where deflated. When I replaced my outboard I noticed no difference in water level at the transom, suggesting the amount of bouyancy the tubes give.

As for Tube bounce, hadn't thought of that one Richard. Might be why Kohaku gets out of shape at 40knotts so easily, but I can always trim in to get rid of this but must have reached the maximum design speed for my hull. Perhaps Daniel could give me an indication of his top speed in his BWM with a 130 on the back.
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Old 24 July 2005, 06:04   #39
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the latest generation of buzzis may be hard boats but i think drew langdon regularly beats the hard boats in his buzzi RIB and is leading his class .
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Old 24 July 2005, 06:06   #40
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should have posted last comment on boatmad really !!
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