John/Bob,
While these very interesting ‘sail-assisted ship’ experiments were going on and getting everybody quite excited in the 1980s, marine-diesel-engine manufacturers like MAN-B&W and Sulzer – and even Japan’s Mitsubishi – were making such great advances in improving the fuel-efficiency of their engines that these ‘sail-assistance’ projects ceased to be cost-efficient – especially when the price of oil started to fall (crash, even). So they just kind of faded away.
The Stevie Clarke ship ASHINGTON was fitted with the Walker Wingsail, which went on to be fitted to some yachts but not much else.
Bob

Very interesting shot Bob. That idea never seemed to really catch on did it, I seem to remember Stephenson Clarke tried it on one of their colliers as well. Perhaps it got in the way of the radar more than it saved fuel, or could we see it making a comeback in these hard times? Good stuff.
Regards
John J.