Join Date: Jul 2000
Thanked 235 Times in 222 Posts
Rep Power: 18
Re: Mystery sail found in my boats spare parts
The Tanzer 7.5 (24.5' LOA) used a ~90-95% LP jib with 3 small auxiliary battens along the leech.
Many 'planing hull lake boats' from Minnesota, Wisconsin, and Western New York (and Ontario), especially when sailed in high wind venues, have small aux. battens on non-overlapping jibs. These 'small' LP jibs, also have a 'roach' (convex curvature) added to their leech and the small aux. battens help to support the 'roach' of the small jib. If the battens hit the mast when tacking, .... not a problem as the battens will pass across.
This is a 'skimming dish lake boat' jib design that is still common and has descended from the Great Lakes / Upper Midwest super-fast 'skimming dishes' / Scows of the 1890s, and are still used in today's 'one-design' scow, etc. racing fleets. The fast 'Sandbaggers' of the NJ bays and the fast Chesapeake Log Canoes also used and still use battened/roached short LP jibs.
FWIW - The Tanzer 7.5 (24.5 ft. LOA), as an option, had such a battened and roached ~90-95% LP jib attached to a clubfoot (a jib boom attached to the forestay wire) that is used to make such short jibs self-tacking (w/ single sheet control).
If there are fairlead tracks that run 'across' your boat, the roached and battened jib probably has a large aluminum flat plate 'clew iron' drilled with 'multiple holes' and is attached to and is a substitute for the clew .... for multiple attachment points in order to set the correct clew/jib sheet (fairlead) angle ... this is used instead of a pressed-in clew grommet or clew D-ring. A double-block is usually shackle-attached to the 'clew iron' - for much better 'purchasing power' - solely by hand. No fore/aft jib tracks needed when flying this 'short' jib. The 'transverse' jib tracks do double duty as a 'barber hauler' ... used to very precisely control how much the 'slot' between main and jib leech is open or closed. ..... if the boat is set up this way. Scow racers vastly prefer such 'set ups' over the traditional fore/aft jib tracks.
On a furler you can't roll up a battened jib all the way; but, it can be partly rolled in order to reef.
Note the jib battens in the attachment.......
Last edited by RichH; 07-11-2016 at 01:33 AM.