Dennis
just a quick answer. Yesterday I uploaded the planned new sailplan for my IF, Ingeborg. to 'my' page. See under sailplans, here:
http://www.junkrigassociation.org/arne
The total length of the mast will be 9.7m, quite a bit shorter than an IF mast, I guess, and maybe even a bit shorter than that of a Contessa 26, I don't know.
The mast is planned to be a hybrid aluminium and spruce job (The joint can be spotted on the sail plan).
The lower aluminium section will be a 6m long tube, 150 x 5mm, made of 6082-T6 alloy. The top section will add 3.7m (plus 60cm inserted into the tube). This will be reduced to about 90mm diameter in the top. I have started to produce a write-up about the hybrid masts, and use the mast for the IF (and for Frøken Sørensen) as examples.
Arne