The concrete submarine yacht project has released a number of photos on the internet to document what we have been doing in the three decades of our ...
I read everything at the concrete submarine site but it seems like all post ... designs for underwater boats, but none with a mast on top for sailing ...
Concrete ships are built of steel and ferrocement (reinforced concrete) instead of more .... In 1944 a concrete firm in California proposed a submarine shaped freighter which they claimed could achieve speeds of 75 knots. The war ended any ...