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  1. Zonker

    Mast for KHSD 30' cat

    Masts fail by buckling. Buckling strength is very dependent on unsupported lengths. I.e. Deck to Spreader, spreaders to masthead. If you have a 30 ft mast with 1 Spreader the panel length is about 15 ft  With 2 spreaders it is more like 10 ft panel length. So the moment of inertia for a 2...
  2. Zonker

    Mast for KHSD 30' cat

    I think the shorter mast is no big deal. But 2 sets of spreaders mean Kurt is assuming shorter panel distances than your mast with 1 set of spreaders. This is a big deal. You can always build up the step 12" higher but you can't fix the basic strength in the extrusion. Adding a 2nd set of...
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