A few proa details, from Balkan Shipyards.

[rael dobkins]

  Hi guys, anyway Why Not? has been getting all the attention lately....

but it's all for a good cause, Crystal Clear..........

All d best, rael

https://youtu.be/wW3nxZVZ5kc

[laurent]

That guy is Genius : Leonard de Vinci

[rael dobkins]

  thanks Laurent, it's been many years of solving proa problems.... they are difficult boats....  But Leonardo knew nothing about proas and I know nothing about Helicopters.......

  Good Luck.

     from Balkan Shipyards