Thierry Msika wrote:http://www.ewingflagpole.com/specifications.php
They seem to be available in Dartmouth, NS. Would the 25' pole architectural series OK for a 25m² sail?
Metal is T6 alu.
There is also a tilting flange :
Tilt Hinge Anchor Shoebase
This mounting allows the pole to be lowered, although not with the ease of a counterbalanced tilt anchor shoebase. The anchor bolt strength is the same as for the counterbalanced and fixed anchor shoebases.
Has anyone ever used a horizontal flange system as a tabernacle?
Thanks
Thierry
I've had a look at this website. I couldn't find any drawings of the hinged bases, but I would think it most unlikely that this would be suitable for a mast. First, whatever the mast is bolted down to has to be the same strength as the mast. That means at least another piece of tube of the same size, with some extremely good design and manufacture needed to make the join. I don't think I could suggest a design that would guarantee the same fatigue life as the tube. Remember that they are only reckoning to hang a flag up, not a large sail. If you want a tabernacle, a more conventional arrangement should be used, with a hinge fitting
clamped onto the tube. There must not be any holes, or welding, anywhere near deck level. This is the major cause of failure of unstayed alloy masts.
Ewing give bury of 10% for a ground set pole, so they are in agreement with PJR thinking.
A 5" tube with .156" wall, 6063T6, is enough for a boat of 1 ton displacement. I don't know whether 25ft is long enough, you might need the 30ft length.