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     Gary Hendrickson (Garyh) Rating: |
Keel Shape Dimensions for the S2 9.1 Meter Deep Draft Keel Submitted by Gary Hendrickson (#094), Class Rules Committee The Graham & Schlageter keel control drawing is Drawing No. 035-09A Alt. A, dated 6/30/83, entitled Keel Sections & Bolt Pattern. This drawing shows keel section profile dimensions at 13 stations along the shoal draft root chord, deep draft keel root chord, and the tip chord that serves for both keels. A separate square-grid tracing-paper layout sheet contains 1:1 scale keel profiles for the deep draft keel’s root chord and tip chord. These chord locations are at the very top and the bottom of the keel, respectively. The keel has a total height of 48 inches. The location of the actual top of the keel on the boat is often not easy to see, and the keel’s bottom is typically hard to get to when the boat is in her factory-supplied cradle. Scott Graham explains that the keel width dimensions at any other location on the keel can be straight-line extrapolated from the dimensions for these two chords. For the purposes of keel dimension checks, it is useful to define five planes, or sections, on the keel at the following locations: Section 1 -- 40 inches up from bottom of keel The locations of these five sections actually correspond to the locations used for the commercially available keel template set offered for the 9.1 by CompuKeels© of Edina, Minnesota. Keel width dimensions for the 5 section locations on the keel listed above, that have been proportionally extrapolated from the root-chord and tip-chord thickness dimensions, appear in the tables below in the column called "G&S Design Half-Width, Inches." (Note that the keel design profile always divides the actual width by two) Note that the keel shape profile that was chosen by G&S for the 9.1 has its maximum width, or thickness, at exactly 40% of the distance from the leading edge to the trailing edge of the keel, at any location. The maximum design width always equals very close to 10% of the length, or chord, of the keel at that particular section location. For more information and background on the 9.1 keel, refer to the Class Bulletin Board, particularly to a series of informational posts about the keel. Section 1: 40 inches from keel bottom:
Section 2: 32 inches from keel bottom:
Section 3: 24 inches from keel bottom:
Section 4: 16 inches from keel bottom:
Section 5: 8 inches from keel bottom:
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