I apologise for being somewhat off-topic. A week or 2 ago on UK television I saw about a small (one-man) submarine that was lighter than water...
I am sorry to appear silly, but have any of you heard of a ship or boat or submarine propeller where each blade can rotate on its support and back...
Has anyone got any images or detailed descriptions of the PDX Marine Drive (apart from the small image in...
What designs are there for a solid-fuel-fired or oil-fired steam jet boat? Full size, from cabin cruiser size up to patrol boat size, not toy....