900ss
Well-known member
Yes, it was Toshiba that sold the machines to them.
Have 6 axis CNC lathe, can bring it to you
- Thread starter 900ss
- Start date
Yes, it was Toshiba that sold the machines to them.
Yakoo752
USN
meh, it was really a non-issue for Sosus and our SS fleet. Targets could never find boats anyways
Mike95060
Work In Progress
Please elaborate. Are you saying you couldnt find the russian subs when they were noisy anyway?
Yakoo752
USN
I'm saying that our overall capabilities to identify them were not really diminished by their new screw
I am a submariner. Qualified and sat passive broadband for a deployment.
Target = any vessel that sits on the surface of the ocean.
boats = submarines
Ships have a damn difficult time identifying submarines. We could bang on the hull with 25# sledges, run pumps on max, and make tons of noise all the while sitting within a few hundred feet of our own ships and crickets... never be seen by ship staff actively looking for us.
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Mike95060
Work In Progress
Ohhh ok. Did the quiet screws make boat to boat loaction more difficult?
Mike95060
Work In Progress
Well I'll be damned. It is a model 400! I see a still but no video. Is that where flow was?
Yakoo752
USN
I wasn't around in the 80s but I can't really see how it did.
Submarine sonar theory is some really cool shit. Sounds doesn't act the same way in water as it does in the air. There are so many factors as to how sound propagates. A good Dive can hide a submarine quite easily.
Cavitation is a huge problem for anyone at sea, it can cause some signification damage to your screw (edit, and thus your drivetrain/engine) . A slow spin up and not running at full manages it easily.
Submarine sonar theory is some really cool shit. Sounds doesn't act the same way in water as it does in the air. There are so many factors as to how sound propagates. A good Dive can hide a submarine quite easily.
Cavitation is a huge problem for anyone at sea, it can cause some signification damage to your screw (edit, and thus your drivetrain/engine) . A slow spin up and not running at full manages it easily.
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900ss
Well-known member
Dammit, I give up. Not really, you guys will dig seeing their robot dolly moving it in. Who can school me on linking videos from Google Photos?
It's in the SCIF, which is soon to be CNC lathe town.
Flow's area was to the left of this view. She's sold by the way, to Joby, just up the road from you.
Climber
Well-known member
For one, cavitation noises from the blades were different for every screw (sub propeller), it was a means for identifying the different boats.
When you can mill out the imperfections to a greater degree, it makes it harder to identify individual boats and reduces the distance you can do so.
I worked with a lot of the captains and officers (and the rest of the crew) and they were pissed when Toshiba did that.
Yakoo752
USN
There was so much unknown back then about sound propagation and mitigation. A good PBB guy can tell you exactly what type of ship it is based on what he's hearing alone, they confirm it by what they see on the screen (depending on how fast he vessel is moving, you can come close to approximating size of the vessel based on bow splash). The green waterfall is trippy. I got good enough to identify fishing trawlers and freights. I could occasionally identify a Japanese or Aus vessel and type based on sound (I was 7th fleet). It was all about initially identifying how many blades were on the screw (hearing) and how many screws were rotating (seeing).
location to location is a whole nother ball game. Look into thermoclines and bottom bounce trajectory. really cool shit
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Climber
Well-known member
Yeah, I didn't understand why they put so much money and effort into the bathythermographs until I understood who thermal layers were incredibly important to submarines for avoiding detection.
Definitely fascinating stuff!
Yakoo752
USN
Yeah very much so. I can really geek out on it.
long story short... Small world time. I'm a submariner. I went through sub school and also got my dolphins (required/standard practice nothing really special but still very special - I even got my Australian dolphins due to a 6 week cross deck, more of an honorary pair but none the less.). Through the process you are taught about some guy who developed the theory on how sounds propagate under water and how to hide. You learn about SOSUS and how it works and it's role. Again, this old guy created the tech...
17 years later, I am at my inlaws house for a neighborhood get together. This old man (at least in his 80s) is sitting in the corner by himself. I like old people, they have cool stories. We get to talking and I tell him about my past including being a submariner... his eyes light. He's the fucking old man we learned about. Some Stanford professor that literally created the theory and literally supported the development of modern submarining. Turns he's my inlaws next door neighbor.
We ended up walking over to his garage where he pulls out all these old papers and experiments he did. Just kept pulling shit out. Impressive old dude for sure.
he still teaches at Stanford to this day. More of an adjunct role to keep his mind busy
for the life of me, I can't remember his name. I'll message my FiL and find out...
that's my cool story for the day.
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