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2. May be made from aluminum plate or foil shaped of fiberglass and foam about an aluminum center plate.
3. Rudder shafts shall be of solid aluminum with properties equal to or better than #6061- T6 alloy. Shaft diameter shall be 1 in. ± 1/16 in.
4. Aluminum Rudder
a. Extension beyond hull when in fore and aft position 13 in. max.
b. Material - Aluminum alloy with properties equal to or better than #6061-T6.
c. Thickness - 3/16 in. plus or minus .010 inch.
d. Sectional shape - flat to within 4 in. of the edge with all edges rounded to no less
than 1/32 in. radius.
e. May be painted, anodized or plated; built up rudders prohibited. Fillets may be
added to the rudder to streamline that joint between the rudder and the rudder post and may not exceed three inches in any direction from the point defined by the intersection of the central line of the rudder post to the top edge of the rudder.
f. Outline shape - blade must fit within rectangle 21 in. fore and aft by 12 in. deep.
5. Foil Shaped Rudder. All length dimensions are inches.
Material - Aluminum alloy of minimum tensile strength equivalent to #6061-T6
alloy for the center plate inside rudder. Fiberglass, polyester, vinyl ester, epoxy resin, gelcoat, or LP paint is allowed to fabricate the foil shape of the blade. The coring material is optional. Carbon fiber is not allowed for body or core.
Weight - Minimum weight per rudder is 3.5 lbs for blade plus shaft.
Extension beyond hull, and overall rudder span when in fore and aft position shall
be 16.0 in. maximum.
The leading edge, trailing edge, and line of maximum thickness shall be fair
curves. Sectional shape shall be a fair foil shape with no hollow more than 0.063. The leading edge shall be rounded to no less than 0.10 radius. The trailing edge may be of squared, circular, or 30 deg. angle cut with cross section of 0.10 ± .05 minimum thickness or diameter.
The following dimensions (in.) at the indicated spanwise offsets shall be met. Semicords are referenced to a spanwise baseline 3.5 in aft of the leading edge at zero span and running perpendicular to the inboard closure plane:
The rudder shaft shall be perpendicular to the inboard closure plane with its centerline on center laterally and 1.1 ± 0.06 in. forward of the baseline.
On existing yachts with rudders that are canted with respect to the rudder post, the inboard closure of the blade may be cut back up to one inch to allow foil shaped rudders to be laid up over the existing cut-down rudders