Sub physics - experts needed

MarkShot · 12-04-07, 10:56 AM

(8) Someone mentioned roll induced by the torque of the prop. With AC such torque tends to make turning in one direction easier than the other. Is such true of subs that don't have counter rotating props? Also, in AC rudders aren't perfectly straight to offset the prop torque. Are subs truely symmetrical?

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Dr. Sid,

You asked about variable pitch props. In my current readings, such things were tried in the early 1900s. There is also discussion of various clutches too. Pressure clutches were ultimately abandoned as unreliable.

My second book just arrived ... US Subs post 1945 ... it's hard as I tempted to jump into the second book, since I am only up to reading about the year 1910 and US subs used for harbor defense; but I am trying to have some self-discipline. Also, the book points out that US subs rated for harbor defense versus European subs rated as ocean going was largely semantics. US subs of the period had similar capabilities to European subs, but given the closeness of European coast lines, they considered their subs capable of an 800nm range to be ocean going. Whereas given the USA's relative isolation, the same boats could only be used for harbor defense.

Initially trying to get boats on the West Coast and the PI was very problematic. There was no way to transit them there (they were too bulky to transport by ship) and West Coast build facilities didn't initially exist.

12-04-07, 10:56 AM	#11
MarkShot Ace of the Deep Join Date: Jul 2002 Posts: 1,134 Downloads: 93 Uploads: 0	(8) Someone mentioned roll induced by the torque of the prop. With AC such torque tends to make turning in one direction easier than the other. Is such true of subs that don't have counter rotating props? Also, in AC rudders aren't perfectly straight to offset the prop torque. Are subs truely symmetrical? --- Dr. Sid, You asked about variable pitch props. In my current readings, such things were tried in the early 1900s. There is also discussion of various clutches too. Pressure clutches were ultimately abandoned as unreliable. My second book just arrived ... US Subs post 1945 ... it's hard as I tempted to jump into the second book, since I am only up to reading about the year 1910 and US subs used for harbor defense; but I am trying to have some self-discipline. Also, the book points out that US subs rated for harbor defense versus European subs rated as ocean going was largely semantics. US subs of the period had similar capabilities to European subs, but given the closeness of European coast lines, they considered their subs capable of an 800nm range to be ocean going. Whereas given the USA's relative isolation, the same boats could only be used for harbor defense. Initially trying to get boats on the West Coast and the PI was very problematic. There was no way to transit them there (they were too bulky to transport by ship) and West Coast build facilities didn't initially exist. __________________ War games, not wars! --- Only a small few profit from war (that should not stand)!