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-   -   Unable to dive below 450 ft in TMO. (https://www.subsim.com/radioroom/showthread.php?t=217010)

RRoosevelt 11-28-14 01:30 PM
Unable to dive below 450 ft in TMO.
 
I am unable to get below 450 in TMO. I have tried both the crash dive and normal dive hot keys as well as the button for crash dive on the bridge command menu. Any thoughts? Thanks a lot guys!

cdrsubron7 11-28-14 02:35 PM
Quote:
Originally Posted by RRoosevelt (Post 2264805)
I am unable to get below 450 in TMO. I have tried both the crash dive and normal dive hot keys as well as the button for crash dive on the bridge command menu. Any thoughts? Thanks a lot guys!

What class sub are you sailing in? The only two sub clesses that could go below 450 ft was the Balao and the Tench.

merc4ulfate 11-28-14 03:03 PM
Go to the control room and walk over to the Master depth dial. Click on it where it says 650. Now you better hope your in a boat that can go that deep.

RRoosevelt 11-28-14 03:20 PM
I am in the Shark, a Porpoise class boat. If the master depth dial is the one between the bow plane guys, it only goes to 450. Do I need to fiddle with a setting somewhere or is there another gauge I am missing?


Many thanks

cdrsubron7 11-28-14 06:13 PM
Quote:
Originally Posted by RRoosevelt (Post 2264849)
I am in the Shark, a Porpoise class boat. If the master depth dial is the one between the bow plane guys, it only goes to 450. Do I need to fiddle with a setting somewhere or is there another gauge I am missing?


Many thanks


mer4ulfate is of course correct about the master dive gauge. Crush depth for a Porpoise class sub is 250 ft. Yout might be able to make it as deep as 350 ft, but any deeper and the water pressure will crush the hull of your sub. Just a thought, but your crew might not be very happy with you if you do that. :rotfl2:

fireftr18 11-28-14 08:32 PM
Quote:
Originally Posted by RRoosevelt (Post 2264849)
I am in the Shark, a Porpoise class boat. If the master depth dial is the one between the bow plane guys, it only goes to 450. Do I need to fiddle with a setting somewhere or is there another gauge I am missing?


Many thanks
The gauge you need is in the conning tower at the helmsman's station. Some boats were not capable of going below certain depths simply because they couldn't hold enough negative ballast. I don't know what the depths are on the boats. I rarely go below the 450 feet.

merc4ulfate 11-28-14 09:15 PM
When you get a better boat you can go deeper

RRoosevelt 11-28-14 09:21 PM
560
 
Thanks for the information on the gauge. Turns out 560 is the limit for the boat I was playing in. Thanks Fireftr18! :up:

Sniper297 12-02-14 02:24 PM
"Crush depth for a Porpoise class sub is 250 ft"

Don't get confused between test depth and crush depth. The test depth is the depth that the builder guarantees, and civilian engineers actually dive each new boat down to that depth but no deeper before the Navy accepts delivery. Design depth is 150% of the test depth, and most would go to 200% or better before something failed. Usually that was seals gaskets or valves, in fact the S class had a riveted hull so below 150 feet the water leaked in faster than the pumps could deal with it, so actual crush depth was far below the practical limit. An S class would probably flood completely instead of crushing.

Porpoise was the first US sub with a welded pressure hull, but it still had the problem with the propeller shaft seals and periscope shaft seals leaking heavily under pressure.

cdrsubron7 12-02-14 05:15 PM
Quote:
Originally Posted by Sniper297 (Post 2265769)
"Crush depth for a Porpoise class sub is 250 ft"

Don't get confused between test depth and crush depth. The test depth is the depth that the builder guarantees, and civilian engineers actually dive each new boat down to that depth but no deeper before the Navy accepts delivery. Design depth is 150% of the test depth, and most would go to 200% or better before something failed. Usually that was seals gaskets or valves, in fact the S class had a riveted hull so below 150 feet the water leaked in faster than the pumps could deal with it, so actual crush depth was far below the practical limit. An S class would probably flood completely instead of crushing.

Porpoise was the first US sub with a welded pressure hull, but it still had the problem with the propeller shaft seals and periscope shaft seals leaking heavily under pressure.
I stand corrected. :D :up:

RRoosevelt 12-06-14 07:58 PM
Quote:
Originally Posted by Sniper297 (Post 2265769)
"Crush depth for a Porpoise class sub is 250 ft"

Don't get confused between test depth and crush depth. The test depth is the depth that the builder guarantees, and civilian engineers actually dive each new boat down to that depth but no deeper before the Navy accepts delivery. Design depth is 150% of the test depth, and most would go to 200% or better before something failed. Usually that was seals gaskets or valves, in fact the S class had a riveted hull so below 150 feet the water leaked in faster than the pumps could deal with it, so actual crush depth was far below the practical limit. An S class would probably flood completely instead of crushing.

Porpoise was the first US sub with a welded pressure hull, but it still had the problem with the propeller shaft seals and periscope shaft seals leaking heavily under pressure.
Cool information about the percentages for test and crush depth. I wondered how they worked that out. Thanks!


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