by Ron Pemberton
What is to "Luff up"?
Thank you for your very long question! Finally something I can answer instead of Han making me look stupid (haha Han)!
Luffing up is what you do when you push the tiller away from you and go up into the wind. It is called thios becuase the 'luff' of the genoa and the mainsail begin to flap if you go to far into wind.
See my article on Points of Sail
for more information.
I am sure Han will chip in and give you a whole lot of extra information about ancient ships and I look forward to hearing about it!
PS: If you don't know who Han is check out his questions/answers/stories in Ask The Expert and Sailing Stories.