Hi Antoine,

No, the making of of my Ingeborg’s sail will follow the same lines as that of making the sail of Broremann, Edmond Dantes , Frøken Sørensen and Chapter 5 of TCPJR. On the other hand, I am midway in a write-up about the hybrid mast. I guess I will just add it to Chapter 6 about the (wooden) mast.

As for batten dimension, I haven’t decided yet, but must do so pretty soon since I use batten pockets in my sails.

Checking the lists of available tubes here, I guess I must choose between 35 x 2mm (0.59kg/m, Mb=243Nm) and 50 x 1.5mm (0.64kg/m, Mb=404Nm). The alloy used is 6060-T6 (150MPa).

Arne

Arne,

I am going by the shipping weight listed by the manufacturer.  I will call them tomorrow and see if the actual pole weight is significantly less than the shipping weight. The length of the pole is listed as 33' (10.06m)

I will post what I find for both thicknesses

Arne, Thanks for the guidelines.

 Those guidelines  would preclude use of the thicker pole for the IF as the dry weight of 10m pole is listed at 322#.  Unfortunately, even the 3/16" thick pole weighs in at 217# or 4.6%

I might be able to get away with the thick pole if I go with the Frances (6,800#) which make the pole 4.7% of displacement.

Either way, I will not be meeting your parameters unless I go fiberglass or carbon fiber

OOPS! that is another way of saying 3/16"

Problem solved. 

dennis gibbons wrote:

Thanks David for the feedback.  Google searching has led me to a source of flagpole with a  6.35 mm wall thickness. While heavier, it may give me more of a safety factor.  Or am I overdoing it a bit?