Anything above 1.6 mm should be fine. = 1/15 th of an inch

1.8 mm would be prefect = 1/14 of an inch

But 2.0 mm (2/25 of an inch) is most available for tubes of the outer diameter your looking for and will work well to. Don't go for 3 mm as that is only heavy and your than better of with a larger diameter 2 mm tube. Stiffer, lighter, and stronger.

Wouter

Wouter,

Thanks for the feedback. Since my boat is still in winter storage, I pulled the 2" OD number off the top of my head. The tube I've got now is probably closer to 1.5", though. Smaller diameter tube would necessitate a thicker wall, right?

The reason I'm asking is because I came across a source for 6061 tubing, but they have only 0.55" or 0.125. Sounds like the one would be too thin, and the other would be too thick. Ideally, I'd like to find something in the .07 - .08 range.

>>>Smaller diameter tube would necessitate a thicker wall, right?

Yes, but it is a very bad relationship. Always go for bigger diameter than bigger wall thickness. The larger diameter tube is always lighter for the same given stiffness.

Indeed .07 and .08 " are good wall thicknesses as long as you mian diameter is at least 1.5" or bigger.

If you get 0.07 by 1.5 than you'll have to support it in the middle to prevent buckling but on a N6.0 you can tie th pole to the foil and solve that little issue that way.

Good luck.

An inch = 25,2 mm

Again Ideal pole will be 40 mm by 2 mm tube. Or get very close to this one.

If you can't find that

go for 35 mm by 2.5 mm or 3 mm and support that in the middle !

If you can't find that than look harder.

If you find something and you're not sure wether it will work than contact me and will do the math.

Wouter