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With the topmast assembled, using
Plan Sheet 4
for reference, the locating hole for the fid
can be drilled as shown. The fid
will be formed from 1.5x1.5mm walnut and when the topmast is 'shipped' it will sit down onto the top surface of the lower
mast top trestletrees to hold the topmast at the correct height, as such its positioning is critical.
Note: Only pre-drill the locating hole at this stage, do not fit the fid or the topmast will not pass through the mast cap. The fid
is made from 1.5x1.5mm walnut cut to a length of 8mm.
Identify the main topmast trestletrees (97), main topmast crosstrees (with hole) (98) and main topmast crosstree (without hole)
(99) and, referring to
Plan Sheet
4, assemble the topmast top as shown noting that the topmast crosstree (without hole) is
positioned to the middle of the assembly.
At this stage, put the main topmast and top assembly to one side; do not glue them to one another.
Main Topgallant Mast:
(Photo 063) Using
Plan Sheet 4
for reference, make up the main topgallant mast to the dimensions given as follows:
The main topgallant mast is made up in one part of 3mm dowel cut to a length of 117mm. The first 24mm should remain at
3mm but from this point (24mm from the base) to the top should be tapered from 3mm to 2mm along its length (93mm).
With the topgallant assembled, using
Plan Sheet 4
for reference, the locating hole for the fid can be drilled as shown. The fid
will be formed from 1.5x1.5mm walnut and when the topgallant mast is 'shipped' it will sit down onto the top surface of the
topmast top trestletrees to hold the topgallant mast at the correct height, as such its positioning is critical.
Photo 062
Photo 063
With all three sections of the main mast constructed, the mast as a whole can be assembled.
Identify the main mast cap (37) and main topmast cap (54). Dry fit the main top and main mast cap to the lower mast. Do not
secure. Now dry fit the topmast, up through the cap, insert the fid and position it down onto the trestletrees. Dry fit the topmast
top, topmast cap and topgallant mast in a similar manner. None of the individual components (lower mast, topmast, topgallant
mast, caps & tops) should be glued to one another at this stage.
With everything dry fitted together, manoeuvre the topmast to run parallel and in-line vertically with the lower mast, at the
same time, the lower top should remain parallel to the waterline, i.e. not perpendicular to the mast. When you are happy with
the alignment, glue the lower mast, lower top, cap, fid & topmast securely in position.
Note: Although the lower top must remain parallel to the waterline and as such not perpendicular to the mast, this is not true
for the main mast cap. The cap should be fitted perpendicular to the mast and as such not parallel to the waterline.
This process should be repeated with the topmast, topmast top, cap, fid and topgallant mast.
Note: As with the lower top and main mast cap, the topmast top should be fitted parallel to the waterline (and lower top) and
the top surface of the topmast hounds will have to be tapered to achieve this. Also, the topmast cap should be fitted
perpendicular to the mast and not parallel to the waterline.
Finally locate and fit the main mast pinrail (68) together with belaying pins (197).
Note: A 0.5mm hole, to simulate a sheave, should be drilled fore-and-aft through the main topgallant mast, at a distance of
35mm below the mast head, this will be required when rigging the main topgallant yard tie.
©
36
2006 JoTiKa Ltd.
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