Schwerer Wehrmachtschlepper

Schwerer Wehrmachtschlepper
Type	Half-track
Place of origin	Nazi Germany
Service history
In service	1944—1945
Used by	Nazi Germany
Wars	World War II
Production history
Designer	Büssing-NAG
Designed	1942—1943
Manufacturer	Büssing-NAG, Tatra
Produced	1943—1945
No. built	825
Variants	15 cm Panzerwerfer auf sWS 3.7cm FlaK 43 auf sWS
Specifications
Mass	13.5 tonnes (14.9 short tons; 13.3 long tons)
Length	6.92 m (22 ft 8 in)
Width	2.5 m (8 ft 2 in)
Height	2.07 m (6 ft 9 in)
Crew	2
Armor	6-15 mm (certain models only)
Engine	4.198 L (256.2 cu in) gasoline inline 6 cylinder, water-cooled Maybach HL42TRKMS 100 hp (75 kW)
Payload capacity	4,000 kg (8,800 lb)
Transmission	ZF kb 40D
Suspension	transverse leaf-spring and torsion bar
Ground clearance	46.5 cm (18.3 in)
Fuel capacity	240 L (53 imp gal; 63 US gal)
Operational range	300 km (190 mi)
Maximum speed	27.4 km/h (17.0 mph)

The Schwerer Wehrmachtschlepper (sWS; "Heavy Military Tractor") was a German World War II half-track vehicle used in various roles between 1943 and 1945. The unarmored models were used as supply vehicles and as tractors to haul artillery. Armored versions mounted anti-aircraft guns or a 10 barrel rocket launcher (Nebelwerfer). Fewer than a thousand were built before the end of the war, but production continued after the war of an improved model in the Tatra plant in Czechoslovakia.

On 7 May 1942 Hitler ordered development of a simple, low-speed, half-track, load-carrying vehicle for use on the Eastern Front. Büssing-NAG was selected to develop a new 5 t (4.9 long tons; 5.5 short tons) tractor (Zgkw. 5t neuer Art) to replace the earlier 5 tonne Sd.Kfz. 6 and 3 t (3.0 long tons; 3.3 short tons) Sd.Kfz. 11 half-tracks, as well as the various lesser-known vehicles of the same class. Production started in December 1943 at Büssing-NAG.^[1] Early examples used a truck-like, unarmored cabin similar to the earlier half-tracks it replaced, while later examples featured an armored cabin and engine compartment that looked similar to the Sd.Kfz. 251 armored personnel carrier. Like the earlier Demag-designed Sd.Kfz. 10, the sWS's suspension system consisted of five double roadwheels per side, overlapping and interleaved in the Schachtellaufwerk [de] layout, mounted on swing arms sprung by torsion bars. One idler wheel, mounted at the rear end of each track unit, was used to control track tension.^[2]

Tatra also joined in production, but together both factories produced only 825 vehicles in total.^[3] Tatra continued production of an improved vehicle after the war as the T809.^[4]

In addition to the basic cargo role, the vehicle was adapted as a mount both for the medium 3.7 cm FlaK 43 anti-aircraft gun and the quadruple 20mm flak gun. These mounts were placed at the center of the cargo area with a large gun shield. The sides of the cargo compartment folded down to give the crew more room to serve the weapons. Ammunition was carried at the rear of the cargo area. Another modification was the Panzerwerfer 42 auf sWS, a 10-barreled 15 cm (5.9 in) Nebelwerfer 42 rocket launcher placed over an armored ammunition storage compartment; it was built over the cargo area that was intended to replace the 15 cm Panzerwerfer auf Sf (Sd.Kfz. 4/1), based on the Sd.Kfz. 4 half-track Maultier.^[4]

The Panzerwerfer mount had armor 10 millimetres (0.39 in) thick.^[4]

• schweren Wehrmachtsschlepper mit Pritschenaufbau flatbed body, about 770 built
• 3,7 cm Flak 43/1 auf Selbstfahrlafette schwerer Wehrmachtsschlepper mit Behelfspanzerung - sometimes 2cm Flak fitted instead
• 15 cm Panzerwerfer 42 auf Selbstfahrlafette schwerer Wehrmachtsschlepper mit Behelfspanzerung - at least two built by Martini-Hütte in Salzkotten

• Chamberlain, Peter, and Hilary L. Doyle. Thomas L. Jentz (Technical Editor). Encyclopedia of German Tanks of World War Two: A Complete Illustrated Directory of German Battle Tanks, Armoured Cars, Self-propelled Guns, and Semi-tracked Vehicles, 1933–1945, London: Arms and Armour Press, 1978 (revised edition 1993). ISBN 1-85409-214-6
• Spielberger, Walter J. Halftracked Vehicles of the German Army 1909-1945, Atlgen, PA: Schiffer, 2008 ISBN 978-0-7643-2942-5
• "schwerer Wehrmachtsschlepper (s.W.S.)". Kfz. der Wehrmacht (in German).

• sWS on wwiivehicles.com
• all known sWS info