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    Casting a lead bulb keel
    Hi, It sounds like you had a lot of fun and a few changes of
    underwear
    . That is a big lump. I am glad you managed to achieve it and I bet you are too. Well done. Nice car. Martin555.
    5 years ago by Martin555
    Forum
    EeZeBilts From Keil Kraft
    Well, if we have finished discussing ladies'
    underwear
    , I would like to go on with the discussion on plan creation... Actually, paint finishes on EeZeBilts is a bit of a problem. It's true that balsa is not a good surface to paint on, and a common trick has been to cover it - with tissue, brown paper, nylons or fibreglass - and then work on that. I have always found this to be a bit fiddly and time-consuming, and prefer to get a reasonable surface with sanding sealer, then use car spray paints and finish off with spray lacquer. Remember to seal the inside as well - balsa can swell like anything if it absorbs water. I'm currently trying sprayed acrylic paints in an effort to lower the cost - they seem to work if well sealed.. Anyway, back to the design... It turns out that this hull is not a simple one to convert to an EeZeBilt. The angles on it make the shape critical to get right, and we have no measurements or any precise pictures at right angles. Still, we will do our best... Now we have got a basic hull shape, we look at it, compare with pictures and see if it looks right... When I did this, I thought that the stern should be fatter and the hull should taper towards the bow. Martin555 pointed out that the funnel should be lower and wider, and the mast should be wider... so I tweaked the hull and superstructure until it looked a bit closer... compare fig 10 with fig 11. As we develop a reasonable plan and elevation, we can start to consider cross-sections. In this case I am thinking about powering the hull with water-jets, so I think about where they will fit. Most of the hull can be a simple box structure which the egg-box design is great for - it will only need a different approach at the bow. In fig 12 you can see various stern cross-sections being tried out for jet fitting and similarity to the rear photo. A CAD package is really handy here - you can just nudge lines and angles until they look OK. When the hull shape looks like it's settled down, we can add the cross bulkheads. You can see these in fig 13. From this drawing we will be able to generate the bulkhead shapes, the deck and sub-deck and the keel, just by measurement. But only for the main part of the hull. We will leave the ways you can do EeZebilt bows for the next session...
    5 years ago by DodgyGeezer


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