Picture of a Kockums Naval Solutions designed 4V-275R Mk III Stirling engine, licenced by Kockums to KHI. Four are on the Japanese Soryu Mark 1s (with air independent propulsion (AIP) and lead-acid batteries (LABs)) (Photo via https://blogs.yahoo.co.jp/dark_99_jp/39533734.html).
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The main value of the following table may be the specifications provided by Anonymous, in early October 2018, for the not yet launched Swedish Saab A26 submarine. The first A26 may be launched in 2020. Two are being built for the Swedish Navy and Saab wishes to sell more to Poland and the Netherlands.
Submarine Type | A26 (not yet launched) | Soryu Mark 1s (AIP and LABs) (launched 2004) |
Length | 66.1m long [6] | 84m [8] |
Beam | 6.75m beam [6] | 9.1m [8] |
Displacement | 1925 tonnes surfaced [3] [6] | 2,900 tonnes (surfaced) [8] 4,200 tonnes (submerged) |
Crew | 17 to 35 [6] | 65 [8] |
Weapons | 533mm and 400mm torpedoes, mines [4] Also AUVs and ROVs [6] | 533mm Type 89 torpedos, Harpoon missiles, mines [8] |
Multimission Portal | >6m long [4] >1.5m diameter [4] | no |
Diesel engines | 3 x 8PA4V200SM12 | 2× Kawasaki 12Ｖ25/25SB [8] |
Stirling AIP Type of Engine | 2? x new Stirling with low signature [1] | 4 x V4... or 4V-275R MkIII |
continual output (electrical) | rated electrical output (continual) 4 x 60kW = 240kW [2] | |
continual output (mechanical) | rated mechanical output (continual) is 1.25 x 60kW = 75kW. 4 x 75kW = 300kW mechanical output | |
120% output (2min) (electrical) | rated electrical output at 120% output (2min) is 4 x 72kw = 288kW [2] | |
120% output (2min) (mechanical) | 1.25 x 72kW = 90kW 4 x 90kW = 360kW | |
Electrical Motor | 1 x Jeumont Electric permanent magnet motor [5] | Kawasaki? SMC-8 |
Pressure hull steel | Strenx® 700 [7] |
[1]The A26 will be fitted with new generation Stirling engines, on floating decks and more heavily insulated to have a much smaller acoustic footprint and more power than the previous V4-275R series used in Sweden’s Gotlands and Japan’s Soryus.
[2] Set by Japanese Standard for Ministry of Defense (NDS)
[3] a changeable figure - growing with increasing roles (and perhaps with an eye to the large sized submarine the Dutch want) - best measured in metric tonnes
[4] “Designing For Future Submarine Capability” by Gunnar Öhlund, SVP Marketing, R&D and Business Development Kockums ABhttp://www.sms1835.no/arkiv/2012-08-29%20Sea%20Power%20Seminar%20Kockums.pdf page 7
The information on cost components for the Saab A26s would depend on many technical and business negotiation parameters of course. Some parameters can be quantified but many of them might not be quantified and would remain confidential.
[6] Sweden’s Defense Materiel Administration FMV https://www.fmv.se/sv/Projekt/Ubat-typ-A26/A26-del-for-del/
[7] Pressure hull materials of A26 Strenx® 700 See Table on Submarine Matters may be same as “Weldox 700”. Both equivalent to US standard HY-100 (aka HY100). As Strenx® 700 is commercially available it is cheaper than military submarine use only pressure hull steels.
[8] Wiki right sidebar https://en.wikipedia.org/wiki/S%C5%8Dry%C5%AB-class_submarine
Tomorrow estimated pricing data will be published, comparing A26s with Soryus and TKMS Type 212CDs.
Anonymous and Pete