Wednesday, June 29, 2011

Hull, Deck, centre case and splash

Furhter developments on the hull consists of setting in the collision bulkhead, fitting the tube that goes in the bow of the boat, glassing of the floors and the centre case

The collisions bulkhead is a 8mm peice of foam that was made to the shape of the boat right up forward.  The bulkhead goes across the boat and serves 2 main purposes * giving strutural ingegrity to the boat, giving it more stiffness against the waves. Never good if your boat cant take the force of the waves :P  And the bulkhead also serves as structural part for the forward part of the deck to rest on.
There is a tube that goes up at the very very forward part of the boat, it goes through the collision bulkhead and through the nose cone of the bow.  This tube is just a case that holds in the prod which holds out the main sail (may need to check if that is corret)


The floors that i mentioned in my previous post has to be glass to keep it in place and add more stiffness.  Ultimately all the stiffness and strength in the boat comes from the glass thats laminated on so you would want all the parts of your boat to have glass on to get the maximum potentioal of strength of your boat.

The centre case in this boat is shaped like a trapezoid, it is made out of glass and goes right through the boat.  The perpose for a centre case is to hold the centre board which is a part of the keal.  This add balance to the yacht, unfortunatly i dont know too much on the subject so i cannot elaborate on the subject.


The deck has a few extra things to be done to it, theres the 2 mast plate peices, we will just say the "centre case plate" not sure what its really called and the carbon uni's and glassing the rest of the deck.

There were 2 types of mast plates that we put on the deck.  The first on is placed on the aft end of the blister.  This plate is a massive peice of glass made of several layers of glass and is prity heavy but is very strong and stiff.  This plate is about 120mm long and 80mm wide and half of the plate lays ont the blister and half of it hangs off, the reason for that is that the mast sits on top of this plate but the designer wants the centre of the mast to be on the centre of the bulkhead thats in there so therefore the centre of that plates centre is in line with the centre of the bulkhead.  The 2nd mast plate sit in the bulkhead at the very top of the but down the thickness of blister foam so it sits under and its aim is to take the massive load force that comes from the mast and spreads across the top of the bulkhead.

Carbon uni's is a fibre that only has the fibres going in 1 direction.  We put these carbon uni's diagonally down from the plate thats at the top of the bulkhead and runs down to the cockpit sole, there is another peice of carbon uni running across the the boat just above the cockpit sole.  These uni's serve as a load spreader, when load or preasure goes on the blister to the plate under it transfers to the carbon uni's then runs down, under the bulkhead on the deck it carries down underneath but in a mirror image to the top of part, those mirrored peices run down to the hull then the loads gets transfered down there also.

Glassing the rest of the deck deffinately seems like a harder task to do than what the aft part of the deck does because we have to glass the transition from the cockpit sole to the blister and the foredeck which does pose as a challenge but once we started to get it underway it wasnt so hard.  I think that is because we were deffinately more concentrated on what we were doing and learned from our mistake on the transom glassing but it did take a while.  A lot of darts were put into this bag because there is a tremendous amount of shape change in this boat but we got it done successfully.  On the deck we used the ADR resin which is a different type of resin we previously used and has a much longer pot life so we have more time to work with it.

A splash is something that takes the shape of a certain part of the boat so that when you turn the boat over you can place that splash on the ground and rest the boat on the top of it.  The splash is made out of several different meterials includeing double bias glass cloth and a few more things which i cant really remember (i will correct when i find out what they are)




No comments:

Post a Comment