G'day,

Sorry I have not been contributing.  I had hoped I could do so after figuring out the rig with no track cars or mast bearings.  

Slowly getting there, have figured out how to keep the sail tight against the lee side of the mast using hoops big enough to allow the sail to be hoisted and lowered, how to control twist on a rectangular sail and getting a decent shape from a flat, low cost materials sail.    Pretty sure this will be the rig on the prototype cargo ferry, due to start as soon as the lockdown ends.  

Also been working on solid glass alternatives to foam cores for the hulls, tender and beams to a) save cost (20mm-3/4" H100 PET foam is $US24 per sq m from China) and b) increase the toughness. Several ideas, but testing is slow.  

More on both of these as it happens.