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Papers and Discussions on Screw Propulsion: Reprinted From Transactions of the Institution of Naval Architects (Classic Reprint) - Rilegato
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Excerpt from Papers and Discussions on Screw Propulsion: Reprinted From Transactions of the Institution of Naval Architects
Next I have to notice the comparative trials of two ships, which ap pear, at the first glance, to contradict our experience in the Royal Navy. Table III gives the facts, for which I am indebted to Mr. Wal ter Brock, of Denny Brothers, Dumbarton. It is understood that the two ships were practically sister ships; they were, I believe, built and engined by Messrs. Napier. The broad facts of the case are as follows: The single screw ship was driven knots, with horse-power, whereas the twin-screw ship only reached knots with horse power. This is certainly a very inferior performance for the twin screw ship. When the table is carefully examined, however, a very curious anomaly becomes apparent: The twin screws have an aggregate disc-area more than 40 per -cent. In excess of the corresponding area for the single screw; there fore one would expect the twin screws to have the less percentage of slip.
Instead of having less slip than the single screw the twin screws have per cent., as against per cent.
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