SUBSIM Radio Room Forums - View Single Post - "Driftdown problem" (neg. buoyancy when submerged) addressed?

senjorlossi · 03-15-10, 04:54 PM

Yes, when you go deeper than 80 m the sub keeps on sinking deeper unless you command a new depth of around 60 m or less. Even at around 80 m you can see that the dive planes are in the "up" position.

I thought that it might be connectet to the "silent running" status, as water would not be pumped out of the sub to prevent any noise, but it is not.

OK, I am not a submariner in real live, but I think a well trimmed sub should be able to stay at any depth, even at low speed. Of course there is always some water leaking in, the deeper the more, as the outside water pressure rises. But it´s the Chief´s duty to pump it out at times.

03-15-10, 04:54 PM	#6
senjorlossi Seaman Join Date: Jul 2005 Location: Germany Posts: 42 Downloads: 49 Uploads: 0	Yes, when you go deeper than 80 m the sub keeps on sinking deeper unless you command a new depth of around 60 m or less. Even at around 80 m you can see that the dive planes are in the "up" position. I thought that it might be connectet to the "silent running" status, as water would not be pumped out of the sub to prevent any noise, but it is not. OK, I am not a submariner in real live, but I think a well trimmed sub should be able to stay at any depth, even at low speed. Of course there is always some water leaking in, the deeper the more, as the outside water pressure rises. But it´s the Chief´s duty to pump it out at times. __________________ Best regards, Stefan.