P16
So some tapering of the planks is going to be required of at this point. As 12mm divided by 3 = 4, this gives us a plank width of 4mm. Again referring to the graph the next band width at bulkhead 7 gives us a width of say 14mm. This also is uneven for our plank widths so again divide this measurement by 3. Still short of an exact width and still the need for some tapering. Move to the graph again to bulkhead 6, this measurement may record as 15mm. OK great, 3 X 5mm planks = 15mm exact no tapering.
On the 3 planks mark the calculated measurements from the graph. On the 1st plank start at the bottom of the plank, left hand end, mark up 4mm, at the position of bulkhead 7 mark up from the bottom 4.6mm, then at bulkhead position 6 the measurement is the full width of the plank. Take a ruler and join the dots. This is the taper required for one of these planks to fit the space required. You will note the taper only comes off the top of the plank not the bottom. This will give you a straight surface to mate up to with the lower edge of the next plank. Carry out this operation for the remaining two planks. If your tapering is correct and carefully done this band will be filled to the exact measurement at this point.
Note 1: In regard to all of the above you must always remember that the hull is upside down whilst calculating these measurements and in particular when determining which edge of the plank to taper.
Note 2: Any plank should not be tapered to any less than half of its width. If this situation arises a stealer or drop plank should be fitted and will be dealt with under its own separate heading.
Note 3:This is by no means the correct measurement for any particular ship and has been somewhat simplified to give an indication as to how the planking might actually run.
9. Garboard Plank:
Figures 12, 13, 14 & 15, A, B, C, & D:
This would be without a doubt the hardest of all planks to fit. The garboard in a real ship is heavier and wider than the other planks. Its width is different to the others because normally it is such an odd shape to lie against the keel and twist sometimes through 90 degrees to produce a straight edge for the first of the other planks to lie against. Figure 12 shows a temporary batten secured along the bulkheads at a distance from the keel that is at the maximum width of the piece of material to be used for the garboard plank. As an example say the garboard plank is 10mm wide. Measure the distance from the temporary batten at the widest gap to the keel across the top of the bulkhead. Make sure this measurement does not exceed the width of the plank being used e.g. 10mm. At each bulkhead record the measurement from the batten to the keel, again record this measurement in the bulkhead plank graph figure 11 in the bottom boxes.
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