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Old 12 January 2011, 11:54   #11
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No, i would suggest its too much lift at the stern hence why extra weight in the boat helps.
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Old 12 January 2011, 12:03   #12
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No, i would suggest its too much lift at the stern hence why extra weight in the boat helps.
Extra weight in the bow yes, push the bow down and the stern goes up
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Old 12 January 2011, 13:45   #13
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Chaps your all stars! I was thinking of the ballast idea because it does feel light in the bow but what wouldn't with 190 kg optimax on the back lol!. Was thinking of 60kg as a start point. Only because when we were coming back up the hamble a friend moved to the bow and the boat gained 1.5 kn without touching the throttle. I will give it a try and let you know how it goes. Once again thanks for all you suggestions. All the best and happy and safe ribbing
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Old 12 January 2011, 13:47   #14
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I put mine down to the whole boat being too light. Something to do with a lack of matting or two in the lay up . Helped make my decision to sell it tho and get a proper rib.
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Old 12 January 2011, 13:51   #15
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Helped make my decision to sell it tho and get a proper rib.
Not just a proper RIB, the best type of RIB
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Old 12 January 2011, 13:56   #16
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I put mine down to the whole boat being too light. Something to do with a lack of matting or two in the lay up . Helped make my decision to sell it tho and get a proper rib.
I'd second this theory......... just not enough holding the boat down in the water. More weight anywhere will help - in the bow will mean more force needed to 'lift' the bow via trim so more 'down/planted' at the stern...

More weight at the stern may have the same effect in calm water but make it 'flighty' into head sea?

So loose 1/2 knot top end or loose the scary wobble? - no contest for me !

Ps - I get this on the avon when lightly loaded at about 28knts - when loaded it vanished and I get to very very close to the same speed.
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Old 12 January 2011, 14:37   #17
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When I load the boat up with dive kit, most of the weight is spread around the middle of the boat, too much in the bow causes problems in waves, and as someone else has said to much at the rear makes it flighty. At full throttle with the engines trimmed up there's virtually none of the hull in the water hence the chine walking, with a bit of weight on board the planing pad is forced onto the surface of the water, with more of this in contact with the water the boat is more stable. You could get a similar effect by raising the engines on the transom?
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Old 12 January 2011, 16:36   #18
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You could get a similar effect by raising the engines on the transom?
Not sure - Cookee will know more .. my thinking is that you will have less torque to lit the bow, less leg in the water (less drag), but just the same lack of stable boat/hull in the water.

Props will change the effect depending on the trim also due to the up/down forward/back of the prop blades as they spin etc ( ie the 'real' pitch may change as they rotate due to the angle it meets the water etc etc )
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Old 12 January 2011, 16:46   #19
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Not just a proper RIB, the best type of RIB
You mean a Searider!
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Old 12 January 2011, 17:53   #20
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You mean a Searider!
No no, we've had a Zodiac before. Terrible built quality, console nearly fell off on ripped out when we crossed from Cherbourg to Alderney and the seat also bent (mostly because of GDs weight ). Wouldn't trust a Zodiac again
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