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Old 18 October 2009, 19:49   #11
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Weight has its advantages
Must try that one at the next "well man" session...

...I'm not overweight. I'm undertall.

To the bilges...
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Old 19 October 2009, 01:51   #12
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Old 19 October 2009, 02:42   #13
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To the bilges...
Nooooo .... not yet .....

I forgot how careful you need to be around here .. 360 degree vision for reply post 'sniper fire' .. my qualifying statement should have had the words "In the right places" not forgetting "IMVVHO"after it ..
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Old 19 October 2009, 15:53   #14
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On the money

Weight has its advantages
In what way??
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Old 19 October 2009, 18:00   #15
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In what way??
Firstly I dont mean to demean you project in any way let me get that straight .. we need all these advances in tech to move forward.

I simply made the point in agreement with Cookie that, in the last 10 years Ive owned and operated 4 different hull configurations, and have found that weight configuration is vitally important (together with the hull design) In that ,.. even if there are shortcomings in the fit out of the boat .. where all the stuff is put .. from fuel tanks to consoles, it has a massive effect on the boats performance, with respect to its hull form, and I've sucessfully ballasted various designs to correct the various fit out problems. This has been a frustrating learning curve , and I'd like one day to be able to buy a boat that doesnt have me lifting drums of water on board to make it run right .. My last boat for example was a quite shallow V rib .. but I stuck 2 anchors and chain in the bow locker and was one of the best riding hulls Ive had .. aided by the fact the console was set aft also

Depends ofcouse what sea you want to run in .. but I'll be interested to see how your project goes
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Old 19 October 2009, 19:08   #16
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But the lighter the boat is in the first place the less ballast/trim you'd need to correct any issues.

Cookee's point was an interesting one, i'd never thought about that, but in this case with a hull designed from the start to be that light it can only be a good thing!
Harry
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Old 20 October 2009, 02:28   #17
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But the lighter the boat is in the first place the less ballast/trim you'd need to correct any issues.
Not neccessarily .. because when you hit a wave at speed you need a balance of not too much lift, and not too much bite as both will impede your progress .
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Old 20 October 2009, 02:30   #18
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Firstly I dont mean to demean you project in any way let me get that straight ..
No don't worry, it a learning curve for all! I understand what you are saying, but I think that the problem with mass produced ribs is that they are built to a degree with budget in mind, they have to be as the company's have to make a profit that's life.

If you have you own project you work out you bear hull weight, engine weight and then you can start adding bits, so my rib we started with me at 80KG plus fuel etc etc worked out the COG and then added them in the correct place for the balance of the boat. This gave us the console position, and fuel tank position etc, so then under the decks we said the fuel need to go here so longitudinals and bulkheads here etc. Hopefully giving you a balanced boat..

Of course this happens with the big manufactures but when you hear of them making 2 different length hulls out of the same mould you have to wonder how much thought went into the dynamics of the boat and not profit margins! So now you have a 7m rib out of an 8m rib mould and then people wonder why you have to add weight to keep the bow down from too much lift as nobody wants to drive 1meter from the bow!

As said time will tell if mine is any good!
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Old 20 October 2009, 03:24   #19
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Atlantic 85's are carbon fibre and the RNLI seem happy enough with them, they do weight about 1.8 tonnes though!
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Old 20 October 2009, 11:29   #20
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This is sounding a bit like a modern version of my museum. Mine evolved into what is now the O-Pro. Difference is mine weighs in at 420 Kg fully fuelled with a Merc 60 on the back. Doing a quick subtraction puts the hull at around the 280Kg mark. as opposed to the O-Pro which weighs in at 350Kg. Granted the extra weight means the transom on the new hull will take 170Kg & 90 Hp as opposed to my 110/60, but I do wonder how much of the extra HP will be used moving the extra weight around.......

I'd love to do a back to back run with a modern equivalent, as I'm really curious as to how the heavier setup with more HP handles in comparison.


As for the mass production thing, how many of us could still afford to buy a rib if they didn't make those compromises? Same goes for multiple horsepowers out the same engine block...
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