"Corryvreckan" wrote in message
.uk...
"Andy Champ" wrote in message
news:j-idnSDiMoeUio_anZ2dnUVZ8q-
An apparent wind from dead ahead can add nothing but a force directly
astern.

The case where a true wind from ahead can be used to drive a windmill
that can drive a propeller to propel the vessel is different

I have such a vessel you can buy, she's called "Bhaskara's Wheel".

There is also another option, see he