MAST AND BOOM MEASUREMENT NOTES
|
| 1. |
A number inscribed in a circle is
a reference to the note of that number. |
| 2. |
The type of permitted fittings used
on mast and boom are optional. Permitted are: gooseneck; mast
deck bearing ring, which shall have no moving parts; mast heel
fitting, which shall have no moving parts; halyard sheave and
housing, halyard lock, halyard tail cleat or other securing arrangement,
not more than 3 halyard tail locating clips on the foreside of
the mast burgee and/or wind direction indicator, control line
sheaves, housings and/or blocks, sheet blocks and securing eyes,
boom kicker (vang) system, mast retaining system. |
| 3. |
No fittings should be positioned
so that measurement at the stations shown in the measurement
form may be obstructed. |
| 4. |
The gooseneck fittings of the mast
and boom shall be made so that every boom fits every mast and
both can be measured separately. The profiles, cross sections
and dimensions of the fittings shall comply with those specified
on the mast and boom measurement diagram and the measurement
form. |
| 5. |
The position of the inner edge of
the mast and boom measurement bands shall be permanently marked
with a scribed line or not less than two indentation marks. If
correctly positioned, of sufficient width and of a contrasting
colour, the gooseneck and halyard sheave case on the mast and/or
the end fitting/outhaul sheave case on the boom shall be used
in lieu of any other form of measurement band. If so used scribed
lines or indentations are not required. |
| 6. |
The surface of the basic mast section
without heel, top, gooseneck and other fittings shall be as shown
in the Table Of Offsets (MAST DESIGN SPECIFICATION), within the
tolerances stated. (For the intended prototype measurement the
tolerances are half the figures given in the Tables Of Offsets). |
| 7. |
The mast shall be straight. A permanent set
of not more than 20mm, measured to a taut line touching the surface
of the profile at the lower edge of the upper measurement band
and at station 4500 at the height of the extended aft face of
the sailtrack, is permitted. |
| 8. |
The horizontal movement of the mast at the bearing
surfaces on the boat shall be not more than 5mm at the deck and
not more than 5mm at the heel including movement of the mast
heel position adjustment system. |
| 9. |
The mast bend measurements shall be obtained
as given in the mast measurement diagram - sheet 1of 2. |
| 10. |
Measurement marks. Masts and booms shall have
indented marks at those stations shown in the measurement form,
where figures or controls have to be taken. |
| 11. |
The boom, without fittings, shall be capable of passing through
a 77mm diameter circle. The corss section shall be constant,
with a tolerance of 2mm, from 90mm from the foremost point of
the boom part of the gooseneck to the outer edge of themeasurement
band. |