04-03-07, 05:53 PM
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#11
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Ace of the Deep 
Join Date: Apr 2005
Location: Los Angeles, CA
Posts: 1,207
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Quote:
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Originally Posted by Sailor Steve
Quote:
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Originally Posted by NEON DEON
Since fleet boats are true diesel electric boats they dont lose all power to the screws like a direct drive U boat or S class. So once the planes are down and they have neutral bouancy or less they now are flying in the water and speed takes over.
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I went to the Fleet-Type Submarine Manual looking for a hint about dive times; didn't find any, but this section indicates that they did lose power to the screws momentarily:
http://www.maritime.org/fleetsub/chap18.htm#18A
Quote:
*a. Stop all engines, shift to battery, set annunciators on "All ahead standard," open engine room doors and air locks.
*b. Close outboard and inboard engine exhaust valves, close hull ventilation supply and exhaust valves, close inboard engine air induction flappers, and close conning tower hatch.
*c. Open bow buoyancy vents and all main ballast tank vents, except the group or tank designated to be kept closed until pressure in the ship indicates that all hull openings have been closed.
*d. Rig out bow planes and place on FULL DIVE. Use stern planes to control the angle on the ship.
*e. Diving officer checks hull opening indicator light panel for condition of hull openings. Air is bled into the ship when green lights show all hull openings closed. Watertight integrity is assured when the internal air pressure remains constant.
f. The following operations are performed by direction of the diving officer, who is guided by the existing conditions:
1. At 45 feet, shut the vents and slow to 2/3 speed.
2. At 15 feet short of desired depth, blow negative tank, shut its flood valve, and vent the tank.
3. Level off at specified depth, slow to 1/3 speed, cycle the vents, and adjust fore-and-aft trim and over-all weight.
4. Diving officer reports to conning officer when trim is satisfactory.
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Of course that might explain why it took so long to dive. |
Steve, the stop all engines they refer to are diesels that are shut off. The props are not run by engines but by motors. Electric motors not engines. The diesels are not connected to the prop shafts. The power source is transferred at the switchboard by means of a lever. The switchboard itself regulates the transfer while the motors are still running. You will get a drop in rpm when on battery but the props don’t stop.
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 Diesel Boats Forever!
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