With everything else being equal meaning displacement
, sail area, etc, catamaran
masts are beefier because the initial righting moment of a catamaran
is greater than the initial righting moment of a monohull
. The loading on the sail is directly proportional to righting moment. Loading on the sails
then has to be transmitted to the hull
via the spars and rigging
Naval architects determine the scantlings of the spars and mast. Replacing your mast "with any mast" is not advisable without consulting a naval architect or someone who is very familiar with doing this.