Posted on 07/20/2020 9:11:46 PM PDT by texas booster
Looks like there must be a good reason - beyond running out of quiet ways to turn a 13,000 ton sub.
You’ll note that we can’t see the impeller design inside the duct. It rides about as low as the old conventional propeller subs, because “big blade turning slow” is quieter than “small blade turning fast” to move the same amount of fluid - the old 688s’ props weren’t much smaller.
https://i.redd.it/w82j6df9hwd41.png
USS Cheyenne, the last 688i/688 (Improved) constructed.
Waterjet/attitude jet directional control has never worked out on submarines traveling at any significant speed and fully articulated vectored thrust is both limited and noisy. Neither of these methods provide passive stability and can contribute to a sub performing barrel rolls. Carefully engineered planes are still to date the best method of submarine attitude control, combined with changing buoyancy with ballast tanks.
Looks small.
It’s 130 meters long and 11 meters wide. A Virginia is 115 meters long and 10 meters wide.
What was that about small?
It also has about half the crew - so there’s more room in it for weapons. Lots and lots of weapons.
Pump jet propulsion?
Yup, it’s a modern standard in military and civilian ships. Humanity finally has good enough modeling and machining skills to make it a practical reality on both scales.
OK, I get it now. One is to replace the one that sunk. The second is for spare parts.
You do know the Russians are doing better than us in new construction not being destroyed or having to be scrapped, right?
This a jobs program to produce the only products the labor force and economy are capable of
A lot of that money is wasted on crap like the LCS, Zumwalts, and Fords. This is because the Pentagon brass likes to brag about having the latest toys; working, practical or efficient are not germane to their thinking which is filled with hubris and stupidity.
It does not matter how many of something is built, but how well it preforms the job it was designed to do. LCS (headed to the scrap yard), Zumwalts (may become rear missile platform), Fords (operational training platform), and F-35s are cases in point.
Before the howls of the mob, F35s are soon to be relegated to rearward drone control as they are not survivable in a dog fight with short range BVR missiles and only 200 canon rounds. As a bomb truck, it has to give up its limited stealth with external fuel pods and bombs on wing hard points. All jobs better relegated to new variants of the F15-16s.
“Also, we’re *not* building “ten times” as many new subs and planes.”
We HAVE TO be building 10 times what Russia (or China) builds, otherwise why would people ON THIS SITE keep blurting out that number when there’s a debate regarding military spending?
You wouldn’t be implying they’re idiots, or Leftist stooges, would you?
I just started watching a youtube channel called Sub Brief. The guy running it is an ex submarine sonar tech and calls himself “Jive Turkey”.
In this video he analyzes a recording of an SQS-53C, sent in by a viewer:
https://www.youtube.com/watch?v=4DR-rIOp6aw
Russia may be a lot of things but they are not hurting financially.
We sadly don’t have any shortage of idiots here on FR...
Glad that he is only covering the basics and stops/pauses throughout the lesson.
I was a sonar tech on DLG-34. It had an SQS26-BX. We didn’t have those complex waveforms. We had a mode called PRN, or Psuedo Random Noise, but it was not to be used.
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