Zündapp KS 750 team
| Zündapp | |
|---|---|
 Zündapp KS 750 team |
|
| KS 750 team | |
| Manufacturer | Zündapp plants |
| Production period | 1941 to 1948 |
| class | Motorcycle team |
| Motor data | |
| Two-cylinder boxer engine | |
| Displacement (cm³) | 751 cc |
| Power (kW / PS ) | 19 kW (26 hp) at 4000 min -1 |
| Torque ( N m ) | 51.5 at 2650 min -1 |
| Top speed ( km / h) | 95 |
| transmission | 4 street gears, 1 off-road gear, 1 reverse gear |
| drive | Cardan drive |
| Brakes | Cable-operated drum brake at the front, hydraulically operated drum brake at the rear and on the sidecar |
| Wheelbase (mm) | 1410 mm |
| Dimensions (L × W × H, mm): | 2385 × 1650 × 1010 |
| Empty weight (kg) | 400 kg |
The Zündapp KS 750 was an off -road motorcycle combination developed for the German Wehrmacht .
In 1939 and 1940, nine test vehicles were manufactured for testing and series production began in 1941, which was discontinued after 18,284 units at the end of the war in 1945.
In the following years up to 1948, a further 349 Zündapp KS 750s were assembled in Nuremberg from remaining stocks and parts that were still available from the suppliers.
The designation is also "super-heavy Wehrmacht team ". Like the BMW R 75 , it had a driven sidecar wheel, lockable differential and reverse gear . The essential parts of the drive of the two motorcycle types were identical. In the Zündapp KS 750, the engine cylinders were mounted at an angle of 170 °. The KS 750 was used in the desert of North Africa with Rommel's Africa Corps and in the German-Soviet War .
prehistory
As early as 1934, Zündapp received delivery orders for K 500 and K 800 teams from the Reichswehr . In November 1937 got Zündapp from Heereswaffenamt the development contract for an "over heavy motorcycle with sidecar to hug". BMW also took part in the tender for a Wehrmacht team . The following were required:
- 500 kg payload (250 kg for driver and passenger with weapons, ammunition and full field equipment as well as payload of sidecar),
- 60 km / h continuous speed and 95 km / h top speed; Minimum speed 4 km / h in order to be able to ride in marching columns,
- 4.5 × 16 inch off-road tires,
- Loaded ground clearance 150 mm
- Mudguards with enough space for anti-skid chains ,
- Range without refueling at least 350 km.
The first consideration was to modify the Zündapp KS 600 accordingly in order to meet the requirements. However, the further development of the KS 600 was too complex, many components would have had to be reinforced so that a new design of the entire motorcycle could lead to the desired goal as soon as possible. In 1939 two prototypes were available, which the Army High Command used for test drives. With these two combinations, the displacement had already been increased to 700 cm³ and the cylinders had been raised by 5 ° on both sides in order to achieve more ground clearance. Later the displacement was increased again to 751 cm³.
In the course of the Western campaign , Belgian sidecar machines came to the Wehrmacht . At least the FN M12 model came to Zündapp for test and study purposes; some details of the Belgian manufacturers, which were leading in sidecar drives at the time, were incorporated into the Zündapp design.
Another seven prototypes were produced and extensively tested by March 1941. In comparison drives with the BMW R 75 combination, Zündapp's design proved to be superior not only in terms of the drive, but also in hard terrain. BMW refused to take over the design from Zündapp. Both models were commissioned by the Wehrmacht High Command; Series production began in June 1941. In order to simplify the supply of spare parts, however, 70 percent identical parts were required, primarily including the wheel drive with the limited-slip differential based on patents from Hubert Barth and Rudolf Schleicher .
technology
engine
The overhead two-cylinder boxer engine with 751 cm³ displacement (bore 75 mm; stroke 85 mm), hemispherical combustion chambers and 170 ° cylinder angle was compressed with 1: 6.2. The cylinders of the boxer engine are raised by 5 ° each (no 170 ° V-engine) in order to gain more ground clearance under the cylinders. The control was not designed for high peak performance; the continuous output is 26 hp at 4000 rpm. The maximum torque of 52 Nm is reached at 2650 rpm. The aluminum cylinder head is strongly ribbed over a large area, so that the cooling effect is sufficient even at cruising speed in great heat. The three crankshaft bearings are designed as roller bearings in order to achieve a longer service life with lower frictional resistance. The camshaft and the piston oil pump are driven by the crankshaft via gears. The clutch is a two-plate dry clutch. The carburetor was of the Solex BFR type with a diameter of 30 mm and was ignited by a magnet, either a Noris type ZG 2 a or a Bosch FJ 2R 134.
Transmission and rear-wheel drive
The gear transmission has four road gears as well as one off-road and one reverse gear. The street gears are switched by foot or hand. When operated with the foot, the hand lever also serves as a gear indicator. Reverse and off-road gear can only be switched manually. All gears are straight teeth. The transmission therefore generates a howling sound similar to that of a tram when it is driving. Due to the high torque of the engine, it is possible to start off in the second street gear on normal roads, while the first street gear is sufficient when off-road. Off-road gear is only necessary on extreme inclines or when driving very slowly. The cross-country route was used in particular to be able to ride in marching columns. The power is transmitted to the differential on the rear wheel by a cardan shaft . The lockable differential distributes 70% of the torque to the rear wheel and 30% to the sidecar wheel. Due to this uneven torque distribution, the combination drives straight ahead with a track width of 1130 mm without the counter-steering required for combinations.
- The achievable speeds in km / h
| gear | Street | Off-road gear |
|---|---|---|
| 1 | 18.5 | 3 to 14 |
| 2 | 40 | |
| 3 | 62 | |
| 4th | 95 |
Brakes
There was a hydraulically operated drum brake from ATE with a diameter of 250 mm on each of the rear and side car wheels. Here, too, the asymmetry of the combination was taken into account in the design, because the wheel brake cylinders have different diameters: 22 mm on the rear wheel and 19 mm on the sidecar wheel. If the sidecar is dismantled, a double valve automatically closes the brake lines and prevents the brake fluid from leaking. Driving without a sidecar is not intended and only possible to a limited extent. The front wheel has a cable-operated drum brake with a diameter of 250 mm.
Chassis and sidecar
The motorcycle frame is a welded oval tubular frame in triangular shape made of tubes with a wall thickness of up to 5 mm. The front wheel is sprung with a trapezoidal fork made of conical oval tubes, the rear wheel remained unsprung. The torsion bar suspension sidecar BW 40 (after the date of the first use) is a Zuendapp-Steib construction that produced later by the simple BMW-R-75-side car type was replaced 286/1. The sidecar taken over by BMW in 1943 was named BW 43 at Zündapp. Tubes welded to form a rectangle form the sidecar frame. The sidecar wheel of the BW 40 is suspended from a swing arm in which the drive is located. It is sprung with a Bourdon tube that is located together with the drive shaft in the rear cross tube of the sidecar frame. The sidecar boat BW 43 hangs in the back in two leaf springs and is supported in rubber at the front. With the BW 40 sidecar, the combination is 25 mm narrower than with the BW 43, with which the combination had a track width of 1130 mm; the BW 40 and BW 43 sidecar drives are not identical. The three interchangeable wheels have a drop center rim and thick end spokes; Tire size: 4.50 × 16 inches. The maximum payload was given as 420 kg.
A foot, hand and sidecar heater was manufactured by the Triumph works for extreme weather, which conveyed the exhaust gases from the engine via flexible hoses. From 1943 hand and foot heating ceased to exist because they proved to be unusable. However, all teams still retained a standard heater for the sidecar.
consumption
The tank holds 23 liters, of which three liters are in reserve. The consumption on the road is 7 l / 100 km, off-road at 9 l / 100 km.
Numbers and distribution
|
Year of production |
Number of pieces |
Chassis number |
|---|---|---|
| 1939 | 2 | Pre-series |
| 1940 | 7th | 600 000-600 006 |
| 1941 | 288 | 600 007-600 295 |
| 1942 | 7,228 | 600 296-607 523 |
| 1943 | 7.131 | 607 524-614 654 |
| 1944 | 3,515 | 614 655-618 169 |
| 1945 | 115 | 618 170-618 284 |
| 1946 | 205 | 620 001– |
| 1947 | 76 | |
| 1948 | 68 | 620 349– |
In eight years, from 1941 to 1948, 18,635 Zündapp KS 750 sideboards were built in Nuremberg. Until mid-1942, the teams were delivered to the army in dark gray RAL 7021. The Luftwaffe received its Zündapp KS 750 in black-gray RAL 7019. For the German Africa Corps , the teams delivered there were delivered in Africa-beige RAL 8000 in 1941/42. From 1943 onwards, all army vehicles were painted a dark yellow - without a RAL number.
The Zündapp KS-750 team, for which the Wehrmacht billed 2,175 Reichsmarks for each model built at the time , is in great demand as a collector's item today because of its elaborate yet robust technology . For a well restored Zündapp KS 750, over 50,000 euros are being offered today (as of Oct. 2018).
With foot and hand heating (also sidecar) and Notek camouflage headlights
With machine gun
With standard bulky hook
literature
- Siegfried Rauch , Günter Sengfelder: Zündapp in the picture. The Nuremberg years 1922–1958. 1st edition. Motorbuch Verlag, Stuttgart 1998, ISBN 3-613-01919-1 .
- Karl Reese: German sidecars from 1903 to 1960. 1st edition. Johann Kleine Vennekate Verlag, Lemgo 2011, ISBN 978-3-935517-60-7 .
- Thomas Reinwald: The heavy armed forces teams. Zündapp KS 750 and BMW R 75. UNITEC-Medienvertrieb, 2011, DNB 100907380X
- Hans-Peter Hommes: Detailed description of the Wehrmacht team Zündapp KS 750, self-published by HP Hommes Viersen
Web links
- Technical information about the Zündapp KS 750 team
- Power flow of the Zündapp KS 750 ( Memento from March 4, 2016 in the Internet Archive )
- Sectional drawing of the engine ( Memento from April 28, 2014 in the Internet Archive )
- Zündapp KS 750 Solo ( Memento from March 4, 2016 in the Internet Archive )
Individual evidence
- ^ Karl Reese: German sidecars from 1903 to 1960. 2011, p. 26.
- ↑ Thomas Reinwald: The heavy armed forces teams. 2011, p. 3.
- ^ Karl Reese: German sidecars from 1903 to 1960. 2011, p. 160.
- ↑ Thomas Reinwald: The heavy armed forces teams. 2011, p. 15.
- ↑ Thomas Reinwald: The heavy armed forces teams. 2011, p. 26.
- ↑ Applied on December 19, 1939; DE1939B0189380.
- ↑ According patents Hubert Barth and Rudolf Schleicher (DE1939B0189380 published on 11 March 1942 requested on 19 December 1939).
- ↑ Thomas Reinwald: The heavy armed forces teams. 2011, p. 7.
- ^ Karl Reese: German sidecars from 1903 to 1960. 2011, p. 28.
- ↑ Bosch Automotive Pocket Book. 10th edition. Stuttgart 1950, p. 309.
- ^ Werner Oswald : Motor vehicles and tanks of the Reichswehr, Wehrmacht and Bundeswehr. 14th edition. Motorbuch Verlag, Stuttgart 1992, ISBN 3-87943-850-1 , p. 79.
- ^ Werner Oswald: Motor vehicles and tanks of the Reichswehr, Wehrmacht and Bundeswehr. 14th edition. Motorbuch Verlag, Stuttgart 1992, ISBN 3-87943-850-1 , p. 64.
- ↑ Motorcycle special. In: Oldtimer Market . No. 8/2014, p. 150.
