F.3.1 Mast Materials

[MattAdministrator]

OD Rules are:

F.3 MAST
F.3.1 MATERIALS
(a) The spar shall be of Aluminium alloy to specifications 6061-T6 or HV-90WP or equivalent.

Per the ERS, the spar is defined as the extrusion plus its fittings, including the heel plug. The fittings and heel plug are not made from 6061-T6.

This rule should be rewritten to limit the scope of this requirement to the (spar) extrusion. The “HV-90WP” designation should be deleted, unless it does actually refer to an acceptable alloy equivalent to 6061-T6. Delete “to specifications,” since 6061-T6 is the alloy designation; it is not a specification. There are suitable specifications for the alloy that could, and maybe should, be called out somewhere, if that is desired.

[MattAdministratorAdministrator]

Another way to consider this is since the mast (and boom!) must be obtained from a licensed spar maker, why do we need this requirement at all? These requirements should be in the super secret Etchells Builder’s Specification.

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