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i know this proabaly sounds dumb, but real military subs can go in reverse, right? if they do, is it by their main propeller or by thrusters/mini propellers?
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Not dumb at all!
Subs will
Not dumb at all!
Subs will use the main propeller (called a "screw") for both ahead and astern movement. I'm sure a current or former "nuke" could explain it in serious detail but the simple answer is the boat uses a clutch mechanism to disengage the shaft from the reduction gears and reapply steam and the gears to begin spinning the shaft the other way. A boat will shake as the excess foward momentum is worn down and reverse speed is gained and this period is called "backing down" -
Hi y'all
I don't know if
Hi y'all
I don't know if the following is already in active use, but I'd imagine it'll work]http://www.subcommittee.com/forum/icon_smile.gif[/img]
IF someone needs it, then a full, quick reversal of the pitch (without thinking about noise) offers quicker 'reversal' cause U wouldn't have to wait for the propeller and shaft etc. to stop before engageing reverse. Quick reaction must be the number one goal in case of an emergency stop.
...just a few thoughts.Comment
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Gents,
The screw is controlled
Gents,
The screw is controlled purely by the throttles on US boats. If you're steaming ahead and want to stop or go in reverse, the ahead throttle is shut and the astern thotle is opened. This is done simultaneously, in a very smart and military manner! The kid on the wheels is usually a pretty sharp dude, even if he is an Electrician's Mate!
Controllable pitch screws are not used by the USN for many reasons,SubSafe and arrangement issues among them.
Take care,
BillComment
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Thanks for setting that straight,
Thanks for setting that straight, Bill. I guess a pitch prop. IS more fragile than a fixed prop, so I see your point / reasoning.
Also, I'm sure too that every hand onboard is, as you say, pretty sharp. Anything less would endanger the hole integrety of both sub and crew.
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