Monthly Archives: November 2013

S-tank: investigation regarding increasing the engine output

Memo (dated 1964-02-22) from Bofors regarding various possibilities in increasing the engine output of the S-tank. Options mentioned are a supercharged 275 or 300 HP version of the Rolls-Royce K-60 piston engine (a 240 HP version powered the first incarnation of the S-tank), a 300 HP Volvo piston engine in development for use on the pbv 302 APC and a Boeing 553 turbine.

Archive reference: SE/KrA/0266/005/01:H/F II/5

S-tank live fire trials

Watch this film clip to see an S-tank shot at, driven over minefields, exposed to simulated tactical nukes, strafed with aircraft guns and finally napalmed. Remember to enable English captions if you can’t understand spoken Swedish.

Why does the S-tank look like it does?

At the time when the first vague ideas about the S-tank started to take form (late 50’s), weapons technology was far more advanced than armor technology. It seemed prohibitively hard to design a tank that had sufficient protection against modern HEAT and APDS shells while also maintaining decent mobility and staying within reasonable weight limits. When the French and German governments cooperated on the Europa-Panzer project (what would become the AMX-30 and the Leopard 1), one of the stated design goals was to sacrifice armor strength in favor of mobility and weight savings. The British Chieftain was considerably better protected but especially in its early versions suffered from high weight and poor cross-country mobility.

Technical specification, S-tank type A

Original title: Teknisk bestämmelse för stridsvagn S, typ A

Incomplete; I only photoed the 60 or so pages I found most interesting (out of a total of 144). Dated 1964-10-04. Note the wax seal on the first page.

Archive reference: SE/KrA/0266/005/01:H/F II/5

S-tank. Costs for the 0-series

Original title: Strv S. Kostnader för 0-serien

Memo describing an official decision regarding costs for the S-tank prototypes. Dated 1963-10-19.

Archive reference: SE/KrA/0266/005/01:H/F II/4