Linda Crew-Gee wrote:

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If I am correct - awaiting Arne's calculations / (CAD?) for his sail with a raked mast in  its current position.

Thanks a lot 

Linda 

Linda,

I cannot do more without knowing better where the mast will go. I suggest you print out one of the jpeg versons of my sailplans and draw the mast line on it. Use the scale on the drawing and the double-check the distance from the bow of your boat to get it right. Then scan (or take a photo at right angle and 1m distance of) the drawing and upload it to your album. This way we will all get a better clue. To me it will be fairly easy to re-import that drawing into QCAD again, and see what I can do with it.

Cheers, Arne

David Tyler wrote:

Sorry, Linda, I should have got around to this before now.

I think the weaverbird planform would permit you to put the mast where the bermudan mast is now, without excessive balance area. 17.5 sq m is too much, IMHO. I have drawn a sail of 16 sq m which still gives SA/D = 20. The battens are 2.875m. The mast can be the same length as your sketch, 7m LAP, with a LOA of 8m. The clew of the sail has to be aft of the companionway bulkhead, but there should be enough headroom for you. I think it would be worse to have the clew further forward, as the sheet would then be lower down and would catch you.

Because the boat has been stretched bigger than the drawing, there must be some doubt about the sizes and positions of everything. However, this hull form will be fairly forgiving as to rig placement.

The first try at a sailplan is here

David, I like your smaller sailplan and did a scale cutout to put over the actual side view photograph of Francis ( photo http://bit.ly/2kZS1F9). I did my calculations using PJR which includes the rudder in the CLR, and gave the lead as 7.7% (a little less than the 9% recommended in PJR to allow for the probable further forward CE of the cambered sail). By my calculations your sail appears to need 20% balance using the old mast position and is 20cm further aft than your drawing. 

I have designed several rigs that balanced well using the PJR formula, but apparently you (and Arne) are using a different way to work out the CLR and lead, which gives different results.

Linda, trying looking at the Nalco website.  Walter said that they are considerably cheaper than Ullrich, but I'm not sure if they do flagpoles.

Don't forget that with wood, glass, glue, paint, etc, you have costs, even if you did go and use straight-grained macrocarpa, so the alloy flagpole might not really be that expensive.  Moreover, it will save you a heap of time and time is not on your side. 

Arne - many thanks for advising on the mast as well as forwarding files to Paul. 

David - thanks so much for checking Ullrich and providing dimensions and advice. We've been there already few days ago - so expensive! But this thinner mast should come down in price. We will call / go and see. 

You are right re Murray. I am waiting to hear from him.  

FYI - 2 pictures: interior and the bilges where the new mast might go. 

https://drive.google.com/file/d/0B2VJ9NRZ66F3NTNsYkMzQ2VZRlE/view?usp=sharing

https://drive.google.com/file/d/0B2VJ9NRZ66F3RmVBa2g2Tk0zOTA/view?usp=sharing

Have a good day (you've been well busy already) and Good Night.

Linda

Mast dimensions: The constraint will be what you can actually get hold of in NZ. I see that the two major suppliers, Ullrich and Wakefield, are listing 100 x 3 and 125 x 3. If you wanted to go really over the top for sailing in offshore gales with the latter, according to the Ullrich list, the former weighs 2.477kg/m, so 12.4kg for 5m, 14.9kg for 6m; the latter weighs 3.116kg/m, so 15.6kg for 5m, 18.7kg for 6m.

I think you had better post some photos of the internal structure forward, to permit of more advice about mast positioning. Murray Reid is a qualified surveyor, and on the spot, and I think that his will be the most authoritative voice on what can/should be done about reinforcement.