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7-bladed Sub Screw Skew (angle) (Patreon)

Published:
2020-10-03 14:16:35
Imported:
2026-06
Tags:

Content

Here are two great perspectives showing the angle of skew to the 7-bladed submarine screw.  It slices the water like a knife with maximum surface area to prevent cavitation.

Photo credit to @saturnax1 (follow him on twitter)

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Comments

Lord Rudsmore

Still, two small diameter skewed propellers is worse than a large one; do you know at what speed these turn?

Aaron Amick

It's been a long time, but I **think** the max RPM of Type 3 nuclear plant was about 180 rpm. Keep in mind, it's not about speed, it's about silence.

Aaron Amick

These sailors will shut down one side of the power plant once they got on station.

DrPatreon

Aaron, I bet you picked up the second screw “sea milling” (like the term “windmilling”) turning in the ocean. Or if one side was locked picking up the noise from the fixed screw. Either way, something else to grab sound from. Also, I think Gorka was referring to the same thing you were. Thinking they would have to turn slow. But tip speed would be slower than a larger screw at same rpm. Thus, possible less noise. Aaron, my suggestion over time... Go “Tom Clancy”. You are a book writer and media person. Like he did in the past. time to press showing how things are done in the USA, and U.K. He pressed the limits. Yet, he enabled a entire new generation of top flight genius level folks to be drawn to the Navy. I believe we need such going to the limits of disclosure again. What Clancy exposed, was far outweighed by the interest of top people to Navy, and Navy contractors. Which advanced their war fighting capacity, brought great innovation throughout. Many example of this next generation who chose Naval associated careers, due to his writing. You are same position. You may not know it, but you are. Inspire the next generation, please. :)

DrPatreon

Oh, and no excuses Aaron..... Remember Clancy was a insurance salesman before he began writing. :)

Andrew MacDougall

does having two screws that close together create any interference patterns which reduce stealth?

Seahour

Ya, das is correct :D

Whitzwolf

Wow these SSBNs are huge

Matus (Saturnax)

More specifically that's Project 667BDR Kalmar/Delta III class SSBN Ryazan (K-44) in drydock.

Trust Anyone

Yes, stealth and silence is key for the continous at sea deterent!

Aaron Amick

Russians bought the technology to make these blades from Japan. So, yes and no.

Aaron Amick

That is very flattering to compare me to Tom Clancy. I am working on my writing skills with articles to WarZone magazine. We will see what the future holds.

Aaron Amick

Yes, the Oscar SSGN had a very recognizable resonance, the Delta's less but same theory.

DrPatreon

Aaron, Yes, I like your efforts in WarZone. Good job! My one point related to Clancy was not addressed.... He brought forth a vast trove of USA info, while some spider hole people did not like, inspired 1-2 generations of amazing people to join the Navy and its affiliated services. Any so called “security breach” (fake news) Clancy showed us, was far exceeded by encouraging new generations of critical/creative thinkers and high talent for the Navy. YOU, need to carry that torch forward. :) Any comments on thoughts above related to the “one reactor” running?

DrPatreon

Arron is exactly correct. Toshiba sold the milling gear, with a Norwegian firm taking our software, and adding it to these CNC systems. Many of us refuse to this day, doing business with Toshiba. The Nordic company, who name slips my mind now, does not have consumer business. However, they took a big hit on their commercial products. This was all figured out by the Ruskies from “should have been executed” (along with his son), John Walker. From there, the Ruskies followed rest of the bread crumbs, and pilfered whatever tech they could. In this case, they could not copy the tech. So, they bought it from traitors working for corporations. Carl Marx and Lenin perfect in reverse “we will buy their rope to hang them with” quotes.

Faris Asim Shaikh

Kongsberg is a major defense contractor that is selling the US Navy Naval Strike Missiles and the Army remote weapon stations.