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#16
08-01-2003, 10:27 PM
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| The retractable ones have a kind of cover plate below the blades which closes the hole for hydrodynamic efficiency. This would act as some protection as well. They have been recommended for diesel electric propulsion in particular. This perhaps maybe be their forte.  |
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#17
08-01-2003, 11:08 PM
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| By the way, price is quoted as equivalent to a sail-drive + feathering propeller. The propeller unit includes electric motor. The is a problem with coupling a horizontal diesel to the vertical retractable propeller unit. |
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