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post #2 of Old 04-15-2009
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A 50mm OD with a 2mm wall thickness would be the minimum recommended size and thickness for a 25' boat like a Catalina 25 or Helms 25. 60mm & 70mm OD allow for a safety factor and the wall thickness should be somewhere around 2.5mm. A Catalina pole is around 10.5' using the J dimension.

If you are going to build a pole from the extrusions you mention, make sure pole ends are available for the ID of those extrusions.
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