My mast rake set up....that weighted halyard is closer to 12" at the boom.
However, I set my mast back in the box with a 1/2" spacer at the back, and I fill the box in front of the mast to the end.
Then, using a line to a winch, pull the mast forward to about 1/2 " from the fore edge of the mast partner. Then I install a shaped block to keep the mast leaning forward at the rear of the partner. That block is about 2" thick with a curve cut in the fore side to match the mast shape.
The backstay is loose at this stage and we adjust the hydrulic backstay to pull the top of the mast back until we get the rake in the 12" range.
That creats a gentle bend in the mast and my sailmaker shapes the main luff to follow that shape.
We use the hydraulic backstay to shape the sail for upwind and downwind.
The mast is fixed in the partners and shape comes from there to the top.
Ron C.
C&C 38MKIIC.....'77
IMPROMPTU
On Sep 2, 2024 1:20 AM, Sailmail via CnC-List <cnc-list@cnc-list.com> wrote:
Based on the numbers in the manual for the 24 and 38, it looks like 1.1 degree is closer.
Obviously not that big of a deal but it is surprising how much 1 Vs 1.1 Vs 1.2 degrees makes a difference at the top of the mast. Not surprising.. but surprising.. if you know what I mean
The mast can't lean further back at this point because it's against the back of the mast collar and the front of the box.
Based on another 30-1 at our marina, and Randy's photos, the aluminium mast box the mast sits in, is definitely too far astern on our boat.
Not much, (approximately 13/16" compared to the other boat here, when using 3 reference points) but enough.
Randy's photo looks to be 1/2" more but it's hard to tell because the photo isn't framed square... and the actual position may be the same if the mast step blocks are slightly different lengths since that is the reference point used in his photo.
I guess we shall see what happens once I lift the mast and play with the mast box a bit.
Cheers,
Roy P.
1978 C&C 30 mk1
30 Aug 2024 7:07:40 am Dennis C. via CnC-List <cnc-list@cnc-list.com>:
My 2 cents on rake.
Conventional wisdom says old C&C's like 1 degree of aft rake. Multiply the P dimension by the sine of 1 degree or 0.0175. For a 30-1 that's
34' x 12" x 0.0175 = 7.15 inches.
Hang a bucket of water from the main halyard. Estimate any distance from the aft surface of the mast to the halyard at the masthead and add that to the 7.15 inches. With minimal backstay tension, adjust the rake so the halyard is that distance aft of the mast at the gooseneck. The butt of the mast will have to be moved accordingly.--
Dennis C.Touche' 35-1 #83Mandeville, LA
Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
