From memory; I used a 35 mm outer diameter tube with a wallthickness of 2 mm. But I will check back home; I wrote it down in a document.

Any way 1 inch = 25,2 mm

I can tell you one thing now though, My next pole with have a larger outer diameter and less wallthickness. Will be lighter and stiffer then. I did some calcs and settled for 38 mm or 40 mm by 1.5 mm wallthickness for my next pole.

Having said this that 35 mm pole worked just fine although in the strong winds it needed stabilisation by two lines/wires running from the bridle points on the hull to the pole.

Wouter