# 4 mtr RIB

Discussion in 'Fiberglass and Composite Boat Building' started by grp.boat, Dec 4, 2012.

1. Joined: Nov 2005
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Location: uk

### grp.boatJunior Member

Hi all.

I am looking at building myself a 4 mtr Rib out of a larger mould that i have borrowed. Has anybody got an idea of what would be a strong layup using Polyester.

Regards

2. ### tunnelsPrevious Member

CAN YOU POST SOME detaled PICTURES OF THE MOULD TO SEE THE SHAPE it is ??
next what sized motor you hanging on the back ??
And last what will you be using the boat for ! fishing , skiing ,diving etc etc
Sorry to ask all this but makes a differance to the glass layup and what kind of glass is best suited !!
Thanks

3. Joined: Sep 2011
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Location: Spain

### TANSLSenior Member

Rather than the use of the boat, it should be clarified whether it is a boat for pleasure or business and the type of navigation performed. Not to forget, among other things, speed, displacement and distribution of reinforcements.

4. ### tunnelsPrevious Member

what has displacment got to do with it ?Its a 4 mtr inflatable !! ?
You forgot to ask for photos !!

5. Joined: Sep 2011
Posts: 6,947
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Location: Spain

### TANSLSenior Member

Without resorting to mathematical calculations or refer to the rules for calculating the scantlings of ships, just common sense, I can sense that a boat of 4 m, inflatable, weight of 300 kg has to be further strengthened than another, similar, 50 kg of weight.
I've never been able to calculate scantlings of any boat through some pictures.
But what we need is trying to answer the question of grp.boat, not to discuss with us.

6. ### tunnelsPrevious Member

Well you got a lot to learn !!!!

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