Would have been interesting to know if Topp was actually correct in his speed estimate of 20 knots. First off I react a little, considering that the Town class top speed was around 30 knots. Having a deplacement hull I should think it would then need almost 400 RPM's to achieve 30 knots, given that 200 RPM's gave 20 knots.
That is a lot of RPM's on such big propellers in water. Just my opinion.
Fred
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