Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Carlos E.R." Newsgroups: comp.os.linux.misc,alt.comp.os.windows-11 Subject: Re: Submarines [Was: Re: Microsoft Is Abandoning Windows 11 SE] Date: Fri, 22 Aug 2025 22:59:57 +0200 Lines: 39 Message-ID: References: <106mke5$1di32$1@dont-email.me> <106ukm1$35g8p$3@toylet.eternal-september.org> <106v67a$1cgol$1@news1.tnib.de> <106vfvv$3bpmd$1@toylet.eternal-september.org> <106vi4r$3c9cr$2@dont-email.me> <3ihcmlx47d.ln2@Telcontar.valinor> <1070cqj$3jkmu$1@dont-email.me> <1071hu3$1idk1$1@news1.tnib.de> <9fjemlxbio.ln2@Telcontar.valinor> <6jefmlxb6j.ln2@Telcontar.valinor> <10884l7$173em$1@dont-email.me> <1088lbg$1agt7$1@dont-email.me> <9aadne5uMN4JgTX1nZ2dnZfqn_WdnZ2d@giganews.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: individual.net gTC23bCS0zjwtEEQqhGHjg7GEpyvd46xxfCrGNLRwiav6BmspW X-Orig-Path: Telcontar.valinor!not-for-mail Cancel-Lock: sha1:xhwuIUjlr+daNRmZ6yQcE2rB6Y0= sha256:ZN+UVtmzS2mAq06KEVBCJ+tlHNVUS9RCmUBVvU0otfs= User-Agent: Mozilla Thunderbird Content-Language: es-ES, en-CA In-Reply-To: Xref: csiph.com comp.os.linux.misc:71965 alt.comp.os.windows-11:22753 On 2025-08-22 20:55, rbowman wrote: > On Fri, 22 Aug 2025 12:23:39 +0200, Carlos E.R. wrote: > >> Not knowing much about actual subs in our navy, I'm a bit surprised that >> a diesel sub vibrates so much, though. Subs are supposed to be silent, >> but perhaps they aren't when they run the old diesel. > > The pigboats were silent -- when they were running on batteries. > > https://www.usni.org/magazines/proceedings/2018/june/theres-case-diesels > > Like everything else diesel engines and batteries have improved. It's > interesting a diesel boat in stealth mode is quieter than a nuke. > > It takes a special breed of cat for submarines. I've never been on a > nuclear sub but I have been on a diesel that was in the Groton yard. > Besides the psychological profile I'm not built to be a submariner -- or a > tanker for that matter. I don't think there is a height limit anymore but > unless you're under 6' you do a lot of ducking. Spain is building a new class of submarines, the S80, with "Air-independent propulsion (AIP)". «The S-80's air-independent propulsion (AIP) system is based on a bioethanol-processor consisting of a reaction chamber and several intermediate Coprox reactors. Provided by Hynergreen from Abengoa, the system transforms the bioethanol (BioEtOH) into high purity hydrogen. The output feeds a series of fuel cells from UTC Power company.» There are two built currently, but they run on standard diesels. The third one, the S81 is scheduled to have the actual AIP, and then it will be retrofitted on the other two. Which means they are delayed, previously the S82 was scheduled to have it. -- Cheers, Carlos.