Friday, February 21, 2014

Models & Moulds

So the new Shazza is not as different to the old as I expected but it is still very different if you look in the right places underneath. To the untrained eye, and because the model is so small and basic it is near impossible to see the difference between the i550 - Shazza and the new design.

The bottom is two foot longer and it is noticeable in the 50cm long model but you've got to look hard.
And the softening of the chine forward is not as dramatic as I expected, there is still flat surface almost to the bow.
The cabin will be dramatically different, going slightly further forward, a decent amount wider, and a lot longer (almost two foot longer). The cabin will be usable unlike on Shazza, with bunks, table, stove area.
Did I mention the hull will be built from foam/fibreglass and will therefor have a lot more usable internal space due to a distinct lack of ring frames. The strength forward will come via the bunk structure, keel box structure and rear strength/stiffness will come through a stringer for/aft. The sides of the hull will have fibreglass stringers at the chine, shear, and about half way between will be another fibreglass stringer to stiffen the whole lot up.

We (Crofty) expect the hull to come in just as strong as a ply hull, be lighter (quicker and easy to maneuver in the car park), and have no chance whatsoever of rotting.
Crofty also gave us an aluminum cradle which will be excellent as a building cradle and later possibly a launch dolly/trailer.


The model is very rough but it gives the general idea, the rounded bow area can't really be seen but the enormous cabin is obvious.
 
 Enormous cabin easily seen, softened/rounded bottom forward sections still can't really be seen.
 
 Build cradle/trolley is aluminum--just add hull supports and some shopping trolley wheels

 
Secret numbers that determine the position of the mould stations (frames to build the hull around that will be taken out later). The hull will have a collision bulkhead at 500mm back from the bow and a major structural bulkhead at the back of the cabin 3000mm from the bow. The other secret numbers will determine the amount of rocker for/aft, they will remain secret :) 
 
 
One ugly lead bulb mould--could be trashed as I'm unhappy with how I made it.


A bit of a rough job --too many lumps and bumps and it is a guestmate of 150kg, not the 100kg we now want so it may be salvageable.

Big cabin and the stick represents the mast position (approx.) and the rounded bottom in the bow area can almost be seen. The cabin can be seen to be much wider than the old Shazza cabin top which will give a lot more space, especially as there will be no internal ring frames to bump heads on or take up space. The cabin will finish approximately 300mm behind the keel which will allow for much better access than Shazza to get into the cabin. The keel will have a case that holds the keel from the bottom of the hull all the way to the top of the cabin which will keep the keel nice and tight in the boat and allow us to incorporate a winch on the cabin top for lifting and lowering the keel.

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