FreightWaves Classics articles look at various aspects of the transportation industry’s history — sponsored by Old Dominion Freight Line.
Experimental propeller in 1975 breaks midtrip, but crew notices no difference
In 1975, two identical ore/bulk/oil (O/B/O) ships underwent efficiency experiments. During one of these experiments, a new propeller concept broke midjourney, but the ship continued its duty with no changes in performance and the crew had no idea until it reached its destination.