Combined diesel and diesel

Combined diesel and diesel (CODAD) is a propulsion system for ships using two diesel engines to power a single propeller shaft. A gearbox and clutches enable either of the engines or both of them together to drive the shaft. Two advantages over simply using a single, larger diesel engine of the same total power output are that (1) diesel engines have somewhat better specific fuel consumption at 75% to 85% max output than they do at only 50% output, and (2) there is a weight and size advantage to using two higher-speed engines compared to a single lower-speed engine, even with the slightly larger gearbox system.

Combined
marine
propulsion

CODOG
CODAG
CODLAG
CODAD
COSAG
COGOG
COGAG
COGAS
CONAS
IEP or IFEP

Principle of a CODAD propulsion system

CODAD vessels
gollark: And yes, this is a hybrid of JS and SQL via template strings, isn't it great?
gollark: And this doesn't even ACTUALLY WORK.
gollark: ```javascriptexport const enqueueCrawl = async (crawlURL, tier) => { // robotsPolicy will be filled in on first actual crawl for the domain // this has to be done as a fairly complex DB-side query to prevent race conditions console.log("running insert for", crawlURL.toString()) const [domain] = await DB`INSERT INTO domains (domain, enabled, robotsPolicy, tier) SELECT ${crawlURL.hostname}, FALSE, NULL, ${tier} WHERE NOT EXISTS (SELECT id, domain, enabled, robotsPolicy, tier FROM domains WHERE domain = ${crawlURL.hostname}) RETURNING id` console.log(crawlURL.toString(), domain) // Add entry to crawl queue await DB`INSERT INTO crawl_targets (url, domain) VALUES (${crawlURL.toString()}, ${domain.id}) ON CONFLICT (url) DO UPDATE SET added = NOW()`}```This should NOT be quite so bee.
gollark: I'm busy trying to work out exactly how horrible a PostgreSQL query I need to do this stupid thing under concurrent write load.
gollark: So surely YOU can do it, if ""deforming things"""" is so easy.

References
  1. "Babcock wins £1.25bn Type 31 frigate contract". The Engineer. 12 September 2019. Retrieved 12 October 2019.
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