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iMustBeCrazy

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Posts posted by iMustBeCrazy

  1. These days, factory produced mdf sheets come with four very square corners and four very straight sides. Even the smaller sheets.

     

    To make the above shooting board, cut two rectangles from mdf each with 1 square corner and two straight edges (1 long and 1 short) stack and clamp the pieces aligning the long edges with the top piece set down from the top edge of the bottom piece. Fix a fix a stop piece across the top of the bottom piece using the top piece to keep it square. Unclamp. The bottom should now have a stop which is square to it's long edge.

     

    Sounds really confusing but actually very easy once you grasp the idea.

  2. 3D Transom (MDF):

    IMGP0374.JPG.f50d5c2a8bddfe7791258a8f7f079486.JPG

     

    Note that when making any part from the drawings you must make sure that the part is drawn 'square on', those that aren't such as the transom, counter, cant frames etc. need to be corrected.

    For example the transom viewed from the stern appears to be 49 inches high but as shown is is actually 52 inches. To correct this, the drawing from the stern needs to be stretched vertically by 52/49ths (1.0612244).

     

    Also you need to allow for any bevelling which may not be shown. In this case, the fashion pieces are wider on the forward side and the bevel is shown on the corrected drawing. Yes, I forgot the bevel the first time.

     

    Shot0012.thumb.jpg.8c5e23f034c3a3cc0ae2abd8b2998908.jpg

  3. 12 minutes ago, Jaager said:

    You should maybe recheck the location of the sheer point.   I see it as being too close to the preceding station.

    It's certainly not final but I should have pointed out that whereas the others are every second station, as usually depicted, that one is station 15, only a single step from the preceding station (14). It's a bit of a guesstimate to try to fill in the huge gap between station 14 and the transom. Same goes for the first station at the bow.

     

    If I could get out and buy some cardboard I would mock it up to get a better feel for the lines.

     

    But, thank you, all criticisms and suggestions gratefully accepted!

  4. Arrrrggggg!!!!

     

    Three steps backwards, after drawing up the frames at station 2 I remembered ZAZ6425 has two sets of station lines, then I realised that the sheer plan is based on station lines that have no relationship to frames.

     

    While this wouldn't matter for a PoB build I want these drawings to be able to be used for PoF. So I have to re-draw the station lines and sheer plan.

     

    Of course I don't have a table of offsets, but fortunately there is a shortcut I can take:

     

    By drawing a set of rectangles like the one in pink below, where points a and b are on the intersections of a station line and a reference line (in this case a water line) and point c touches the 45° degree line under the sheer plan, point d is the station line / water line intersection on the sheer plan. Unfortunately I don't have many reference lines on this drawing, basically just 4, so I have to base the shape of the 'frame' on those next to it.

     

     

    Shot0001.jpg

  5. 1 hour ago, AON said:

    they became ships.

    First they became a fence, did you notice the latitude of Macquarie Harbour? 42° South, that's roaring forties.

    14 minutes ago, AON said:

    What a fascinating read!  Thank you for posting this.

    You might like this one then, Port Arthur the main penal settlement.

     

    https://nla.gov.au/nla.obj-1961910992/view?sectionId=nla.obj-1965082829&partId=nla.obj-1961946782#page/n26/mode/1up

  6. 8 hours ago, AON said:

    Are these being built by transported convicts?

    Apparently yes, I was aware of shipbuilding at Port Arthur but I assumed small vessels. It seems more likely that the 74 gun was probably built at Sarah Island in Macquarie Harbour on the west coast.

     

    http://www.ourtasmania.com.au/devonport/sarah-isld.html If I have it right, the shipyard was to the right of the bridge.

     

    A nearly completed Brig was stolen from there by 10 convicts and sailed to Chile but the amazing part is that they got it through 'Hells Gate' the entrance to Macquarie Harbour.

     

    https://viewer.slv.vic.gov.au/?entity=IE740422&mode=browse  The entrance is just this side of the lighthouse.

     

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