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At random: "Like the destroyer, the submarine has created its own type of officer and man with language and traditions apart from the rest of the service, and yet at the heart unchangingly of the Service” -- Rudyard Kipling, The Fringes of the Fleet, 1915 |
Diesel boat question Moderators: Jump to page : 1 2 Now viewing page 2 [25 messages per page] | |
Forums-> Submarine Discussion | Message format |
Runner485 |
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COMSUBBBS Posts: 2672 Location: New Jersey | Subject: RE: Diesel boat question Ralph Luther - 2014-07-30 11:56 AMRon, I think maybe you are referring to Thelma in Norfolk or "One arm" Peggy in Chasn.. It's unfortunate that Dex has departed on Eternal Patrol and too Adrian Stuke. They were the authorities on that subject. While personally knowing Thelma of Bells, I can assure you that (I heard this story and believe it to be true) Thelma had the ability to cave your head in if you plugged your nostrils up while she pulled a vacuum...and that Ralph is a no s**tter! | ||
Ralph Luther |
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COMSUBBBS Posts: 6180 Location: Summerville, SC | Subject: RE: Diesel boat question Well, now, see....there is someone with some actual experience in yesteryear. I personally never had met Thelma of Bells that I can recall. I'll leave that to Joe's recollection. Now Peggy here in Chasn. I did on occasion meet and see, She was a regular patron at Tobie's 525 Club on Spruill Ave. Not having any first hand knowledge on her vacuum capabilities, I do know that quite a few of the Thornback SS-418 enginemen did have a tendency to walk and talk differently after being with her. I think she had a billet at their Folly Beach snake ranch. Edited by Ralph Luther 2014-07-30 12:09 PM | ||
Palm Bay Ken |
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Great Sage of the Sea Posts: 539 Location: Palm Bay, Florida | Subject: RE: Diesel boat question Well, before we get totally hijacked, here's a chart comparing altitude to inches of mercury. If we shut down on 6 inches, EABs would be falling from the overhead long before it happened. (IMHO)\ (Inches Hg vrs Altitude.jpg) Attachments ---------------- Inches Hg vrs Altitude.jpg (73KB - 446 downloads) | ||
Bob T |
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Senior Crew Posts: 233 | Subject: RE: Diesel boat question Brings to mind some phrases from the past: "Could suck the chrome off a trailer hitch" "Could suck a tennis ball through a garden hose" "Could suck start a FM 38D8-1/8" | ||
Runner485 |
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COMSUBBBS Posts: 2672 Location: New Jersey | Subject: RE: Diesel boat question Ken we're still talking about pulling a vacuum... And I still believed that our cutoff was 8" of vacuum, That's what I remember. But that memory is 50 years old... | ||
Ralph Luther |
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COMSUBBBS Posts: 6180 Location: Summerville, SC | Subject: RE: Diesel boat question Joe, as I remember it was 8" too. The atmosphere in the would fog just before shutdown. | ||
fortyrod |
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Great Sage of the Sea Posts: 853 | Subject: RE: Diesel boat question I set the switch at 6" on SS490 | ||
Runner485 |
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COMSUBBBS Posts: 2672 Location: New Jersey | Subject: RE: Diesel boat question fortyrod - 2014-07-31 2:31 PMI set the switch at 6" on SS490 I did not realize they could be reset. Thought they were factory set... | ||
fortyrod |
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Great Sage of the Sea Posts: 853 | Subject: RE: Diesel boat question Now you have me wondering Joe. I'm certain they were set at 6 inches. I remember coming out of the yards in 72 and either we were setting them or verifying them, but I'm sure the trip was 6 inches. This was a check I had to sign off on for a yard bird. They had a vacuum pump. But, that was so long ago and I was so young, I could very well be wrong on whether they were adjustable, but I'm dead certain on the 6 inches. | ||
Pig |
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Plankowner Posts: 5024 Location: Gulfport, MS | Subject: RE: Diesel boat question Engines shut-down at 6" on Trutta, Guavina, Tench, Entemedor, and Tusk. Didn't have that problem on Archerfish | ||
Ralph Luther |
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COMSUBBBS Posts: 6180 Location: Summerville, SC | Subject: RE: Diesel boat question I suppose I may be wrong on the 8". There have been a couple of times over the years that I made an error..just a couple mind you. | ||
Flapper |
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Master and Commander Posts: 1107 Location: Tucson AZ | Subject: RE: Diesel boat question guys, the inches Hg drop is relative to sea level = 30" of mercury. So from Ken's nice chart a 6" Hg drop to 24" = 6,000 ft 'altitude' so - rough numbers - the Hg drop is ~1"/1,000 ft up to maybe 10,000 ft or so. Beyond that (bigger vacuums/higher altitudes) it's non-linear, but submariners don't have drop-down O2 masks (as wryly noted) so we don't have to worry about the higher altitudes and nonlinearity. | ||
Ralph Luther |
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COMSUBBBS Posts: 6180 Location: Summerville, SC | Subject: RE: Diesel boat question Thanks Bob for the school of the boat. The old memory banks need a refresher now and again. | ||
Palm Bay Ken |
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Great Sage of the Sea Posts: 539 Location: Palm Bay, Florida | Subject: RE: Diesel boat question Thanks Flapper! So maybe the cutouts were set to 6000 Ft. altimeter reading, vice 24" barometer reading. I don't recall ever seeing a barometer with a dial showing less than 28". Of course, I've not seen every barometer either. | ||
Flapper |
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Master and Commander Posts: 1107 Location: Tucson AZ | Subject: RE: Diesel boat question Palm Bay Ken - 2014-08-01 7:58 AMThanks Flapper! So maybe the cutouts were set to 6000 Ft. altimeter reading, vice 24" barometer reading. I don't recall ever seeing a barometer with a dial showing less than 28". Of course, I've not seen every barometer either. We'll ignore modern high-tech electronic barometers, such as those embedded in smart phones, etc. Most barometers of 'our vintage' - though the dials may read in Inches Hg, along with millibars, etc. - are coiled Bernoulli tubes, and are mechanically adjustable to convert 'local' normal barometric readout to a sea-level equivalent - why? Just so that the pointer lines up more or less with the RAIN - CHANGE - FAIR regions on the dial!. I live in Tucson at ~2,600 ft elev, so my local normal is ~ 27.50" Hg or so - without adjustment I'd always reside in the 'rain - change' regions of the dial. If you're a pilot, you adjust your altimeter (same mechanical basics as your home barometer) to local pressure at ground level in order to yield your altitude above ground level when flying into and out of higher elevation fields. | ||
Pig |
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Plankowner Posts: 5024 Location: Gulfport, MS | Subject: RE: Diesel boat question We never bothered to adjust the altimeter, as the head valve was usually only a couple of feet above sea level. When it dipped below sea level the default setting kicked in... usually before the conning officer finished yelling "Get me up, get me up, get me up!" I don't remember ever "flaming out" when snorkeling on the surface in the North Atlantic; however, during many of those E-Ticket rides the head valve constantly cycled. Makes my head hurt just thinking about it. | ||
Flapper |
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Master and Commander Posts: 1107 Location: Tucson AZ | Subject: RE: Diesel boat question Ralph Luther - 2014-08-01 3:37 AMThanks Bob for the school of the boat. The old memory banks need a refresher now and again. Later in life, after the boats - both ashore, and for 12 years on my own sloops, back ashore finally 'owning' my house I decided to mark off another box on my bucket list ... and at 53, learned to fly, and got my private pilot ticket. For obvious reasons we were well versed in barometric theory, amongst all the other physics to do with flight. and you can bet your bippy I treated the process just as seriously as I took BESS, and my initial submarine qualification, and the requals on new-to-me boats. Both those qualifications left imprints on my brain ... some of which can be summoned up still, lol. The combined quals let me relate the altimeter setting, versus the drop in inches of Hg barometric pressure when a couple of FB's running full bore for battery charge get cutoff from outside air; a very rapid 'rise' from sea-level to something a little higher than Denver - you bet some ears are gonna pop! It's about like being sucked into the core of a tornado (reliable pressure drop records in the -5" to -6"Hg range). Edited by Flapper 2014-08-01 12:39 PM | ||
Boy Throttleman |
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Old Salt Posts: 431 | Subject: RE: Diesel boat question On Carp it was 6 in vacuum with the back up set at 6 1/2 inches. (on the altimeter Only once did it go past 6 inches to not quite 6 1/4 when I hit the shutdown air. Afterward Maneuvering claimed to having shut it down first, we never knew who actually did. But neither of us was going to take any chances on the back up not working either. | ||
Runner485 |
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COMSUBBBS Posts: 2672 Location: New Jersey | Subject: RE: Diesel boat question Ah Mike, with Sirago being a much superior boat then most in Squad 6 we of course trusted the vacuum switch to work at all times which it did whether it was 6" or 8".... | ||
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