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My '79 Mk3's boom does not have a proper outhaul. It has a 25mm pinned to the end cap of the boom and that is it. This is the way it was when I purchased the boat this summer, and I would like to upgrade to an in-boom outhaul system. Could anyone supply me with pictures of the outhaul exit at the and of the boom, and one of the exit of the control line from the boom. I am looking for placement, and line size recomendations.
Thanks in advance,
Adam
Can't offer photos, but my Mk IV's boom (which also had no proper outhaul) has a vertical channel that seemed purpose-made for an outhaul sheave. I was able to find an alloy sheave with oilite bearing of about 1/4" wide, 1" to 1 1/4" diameter that slid in there nicely.
Once I removed the casting from the boom, I was able to drill an appropriate sized hole for the retaining pin. A length of wire (probably 3/32" or thereabouts) has a shackle swaged on one end, a Harken block on the other. A line (3/8"?) that is dead-ended at the gooseneck end runs aft to the block, then forward to an exit block mounted on the underside of the boom at the gooseneck. From there the line goes aft to a cam cleat. The block in the boom is also attached to a length of shock cord, to provide a positive releasing force.
Line sizes aren't really important as the loads aren't high. The wire was sized for the sheave and the rope was sized to be easy on the hand.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Offline
Pictures:
(moved to Black Arts, Internal Outhaul)
If you wanted to run a length of wire through the boom for the outhaul, the inboard casting seems also to be designed to accommodate a narrow sheave. You could then set up a multipart tackle between the gooseneck and the base of the mast to make it easier to adjust.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Last edited by (2006-11-29 01:11:14)
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Offline
Adam: does your MkIII have the elliptical-section boom or the rectangular one like David's MkIV? If the former, I'm currently installing a cascading 4:1 internal outhaul in my elliptical boom and would be happy to send you pix as well as a source for useful diagrams.
Ken Pole
1975 Mark III Santiva
Ottawa
Ken Pole, Ottawa
1975 Mark III Santiva
Offline
Ken, any chance you can put it up on this site (black arts?)? I'm also most interested as I've the eliptical boom design. My outhaul is led back on the outside of the boom and it's not only ugly but I could use the fairleads for reefing...
Gord
Aurora '75 MKIII
SPSC Windsor
I'll offer it to DW -- likely next week once I've cleaned up some of my metal work.
Ken Pole
1975 Mark III Santiva
Ottawa
Ken Pole, Ottawa
1975 Mark III Santiva
Offline
Gord, Adam et al: Check out Black Arts.
Ken Pole
1975 Mark III Santiva
Ottawa
Last edited by (2006-12-01 23:45:32)
Ken Pole, Ottawa
1975 Mark III Santiva
Offline
It is a rectangular section style.
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