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Show New Ship Propeller Has Principle of Gear Shift GLOUCESTER, MASS. A new type ship's propeller which has a variable pitch mechanism to change the "bite" of the blades is the invention in-vention of millionaire John Hays Hammond Jr. and George Colley, Washington naval architect. They predict it will revolutionize marine propulsion and reduce operating expenses. ex-penses. The inventors are seeking patents on the propeller, which, they explain, ex-plain, works on the combined principles prin-ciples of auto gears and modern airplane variable pitch propellers. Hammond demonstrated the invention in-vention by using a regular set of auto gears. He explained how the results would compare with those obtained when a motorist shifts gears to climb a steep grade. He said the new propeller would change its pitch to increase or decrease the "bite" in the water according to prevailing conditions. He added this would enable the vessel to "shift gears" in midocean, thereby retaining the efficiency of its motors while bucking a storm and continuing its journey without having to reduce speed. |