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Old 22 February 2007, 08:22   #1
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Length and sea keeping question??

We were talking with some friends whether some RIB manufacturers use the same molds to make a hull for a RIB from say 5 to 7 mtrs or from 7 mtrs to 9 mtrs.

We looked at some web sites and we found that one manufacturer does not classify their RIBs as per LOA but as per beam.

We wee wondering whether such construction affects the stability or the sea capability of the boat.

Any one has any ideas??
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Old 22 February 2007, 08:33   #2
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Long and thin is usually what makes a good sea boat - look at things like Revengers - Huntons etc etc.

My boat was made from a mould that made everything from a 6.5m up to a 10m.Looking at the hull shape though the wider parts only really come into play when you turn tightly or are side on in the waves which is what you want anyway.

I take it what you are getting at is should a boat have a custom design for each length you have?
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Old 22 February 2007, 08:41   #3
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Quote:
Originally Posted by codprawn View Post
I take it what you are getting at is should a boat have a custom design for each length you have?
Τhat is the bottom line of my question

My view is that each boat length has certain characteristics for beam, weight and draft also bow and transom angles.

If this is my thoughts are correct for example, a 6 meter boat that comes out from the same mold of say a a 10 mtr boat may not have as good sea keeping capability as a similar boat that came out of a custom made mold.

Am I correct or not? an if not why?
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Old 22 February 2007, 11:36   #4
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Like Codprawn I believe my boat came out of a mould with a moveable Transom section that allows the manufacturer to make several different length RIBs from the same mould.

Its probably why I think my RIB is quite wide for a 6.5M.

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Old 22 February 2007, 12:18   #5
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Quote:
Originally Posted by codprawn View Post
Long and thin is usually what makes a good sea boat - look at things like Revengers - Huntons etc etc.
Long and thin slips right in, but short and thick does the trick .....
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Old 22 February 2007, 12:27   #6
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Hightower you making us assuming things here and you will destroy my thread if we will start speculating
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Old 22 February 2007, 12:33   #7
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Sorry Manos, consider it destroyed
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Old 26 February 2007, 16:13   #8
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something that i have always thought about! Surely with a constant deadrise hull the sea keeping will be similar just hindered by length. However im sure scorpion and scorcerer to mane jus a cople use same moulds for varying lengths! These both both have a warped type hull so does it mean the warp finishes in the same place and a say 8m will only have same varying deadrises as a 6m but with a larger flat area????
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Old 26 February 2007, 16:40   #9
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Convex type hulls (like the Scorpions) allow for such modifications. And although the hulls perform well in rough seaw, the drawback is that they propose a lot in normal sea conditions.

However, other types of hulls IMHO do not allow such modifications and they feel very uncomfortable in most of normal sea conditions.
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Old 26 February 2007, 17:03   #10
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Quote:
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Long and thin slips right in, but short and thick does the trick .....
High tower, are you refering to your stature and iQ?????

Should we just call you a "Plug" or perhaps "the wedge"

"It is not the wand, but more so the magician that performs the trick!!!!"
I would add a few happy faces but I dont know how yet....
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