I had great difficulties and much breakage before with heat bending, 
because my bending iron had luthier proportions - ie a 3inch radius of 
cuvature. Now I have a 17 inch radius of of curvature (a section of 
Large steel pipe) which will give musch better heat distribution from 
the woodfire in a big basket inderneath. Uncertain what sorts of 
forming aids they might have had. With boats , i suppose the hull 
framing elements can themselves be the bending form. Worthy of note 
that Paul's submarine builder was the son of a cooper. What an amazing 
museum - the building belonging to the same heritage as its contents

Til now I have not really taken note of these more substantial bridges. 
considerable variety in the treble - according to the berlin catalogue, 
for instance, the JCFleisher is higher than wide (17&14) in contrast to 
the Donzelague's  12&16

re Lepanto, and the galleys as floatting gun platforms, the naval 
historian John Guilmartin says the greatest expense with galley warfare 
was the highly skilled oarsmen ('biscuit' powered)

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