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| Which prop design is better |
| Slower threshold for cavitation but higher top speed |
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38% |
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| Higher threshold for cavitation but slower top speed |
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61% |
[ 8 ] |
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| Total Votes : 13 |
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TLAM Strike
Joined: 30 Apr 2002
Posts: 4866
Location: Rochester, New York
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 Posted: Mon Apr 24, 2006 8:17 pm Post subject: |
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| Kapitan wrote: | Generaly the foxtrot was recorded making its fastest speed at 26 knots, so i would have no doubt that some conventionals could hit 30 or even 33 or more knots.
ok its going to depleate the batters very quick but that boost of speed could be used for emergencys. |
A WWII Gato (A boat with Diesel Electric so its running electric motors when surfaced) could make something like 21 and a half knots on diesels pushed beyond spec. You put sufficient power in to the motor you can get some real speed at the risk of burning up the motors. A burned out motor is better than flaming crushing death at times.  |
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Bubblehead Nuke
Joined: 01 Feb 2006
Posts: 41
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| Posted: Mon Apr 24, 2006 8:52 pm Post subject: |
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| Deathblow wrote: | | That's very interesting :hmm: Makes sense. Is that one of the additional reseasons that SSKs on electric power can be quieter than SSNs, not just because of lack of the need for reactor coolant circulation, but because electric moters don't require reduction gears? Or do they? Guess I'll look it up |
As I understand it, electric motors are wound directly on the shaft. thus no need for gears at all. The motors are what turn the screws at all times. The source of the electical power is what varies. Batteries for normal submerged ops and diesels (with the battery floating for a charge) for surface/snorkel ops. |
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Bubblehead Nuke
Joined: 01 Feb 2006
Posts: 41
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| Posted: Mon Apr 24, 2006 9:07 pm Post subject: |
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If talking about speed on a batttery the USS Albacore, while a non-combat vessel, topped out at 30+ knots. According to some reports, it was faster than the Skipjack class and was the fastest US submarine until the Seawolf class come onto the scene.
Moral: Battery does NOT equal slow speed. |
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TLAM Strike
Joined: 30 Apr 2002
Posts: 4866
Location: Rochester, New York
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| Posted: Mon Apr 24, 2006 9:14 pm Post subject: |
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| Bubblehead Nuke wrote: | | As I understand it, electric motors are wound directly on the shaft. thus no need for gears at all. The motors are what turn the screws at all times. The source of the electical power is what varies. Batteries for normal submerged ops and diesels (with the battery floating for a charge) for surface/snorkel ops. |
On a diesel-electric drive yes but not on a direct drive diesel. 
Are there still direct drive boats? :hmm:  |
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Kapitan
Joined: 10 Mar 2005
Posts: 5385
Location: essex england also st petersburg russia
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| Posted: Tue Apr 25, 2006 4:44 am Post subject: |
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| I dont think so, but there is also AIP to bring into this. |
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