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SdKfz tracked cycle


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#1 FramerT

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Posted 02 April 2008 - 07:33 PM

SdKfz 2 Kleines Kettenkraftrad

Another over-engineered German nightmare or a practical vehicle for it's intended duties? I don't recall another country copying it. Seems a lot of horsepower would be used just powering the tracks.
Comments?
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#2 Mussolini

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Posted 02 April 2008 - 07:36 PM

No armor or guns...and a crew of 3? What was it used for?

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#3 FramerT

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Posted 02 April 2008 - 08:13 PM

Clicking on the "Gallery", I see it was used for stringing telephone cable. It could pull a small
Pak gun or taxi a airplane. I'm still trawling the web trying to find more info on it.
Just thought I'd toss this out, maybe someone has more information on it.
VonPoop??
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#4 uksubs

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Posted 02 April 2008 - 09:05 PM

Clicking on the "Gallery", I see it was used for stringing telephone cable. It could pull a small
Pak gun or taxi a airplane. I'm still trawling the web trying to find more info on it.
Just thought I'd toss this out, maybe someone has more information on it.
VonPoop??


They could tow a Me 262 :eek:

#5 Von Poop

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Posted 02 April 2008 - 10:30 PM

Wonderful machine, it's widespread grabbing by any unit that could lay their hands on one, both axis & Allied underlines just how handy they were, there's a fair few pictures and accounts of ones serving both US & Commonwealth forces, some lovely shots of British owned examples in the Desert that I can't currently locate.

The Kettenkrad has cropped up a fair few times here and on ww2 Talk so here's a quick summary.
  • Designed as a light tractor & ammunition Schlepper (using a dedicated trailer) it eventually went on to being a jack of all trades, I've seen 'em pulling Pak 36's & Flakvierlings through deep mud. Off-road capability is superb, there were Krads still running through Beltring's swamp-like off-road course a few years ago after modern full-tracks like FV432s had practically sunk (mind you, there were Scammells still going too ;)). They can raise the front wheel off the ground and run solely on tracks for particularly heavy going
  • Nice websites with some history, deployment & restoration accounts at: The NSU Kettenkrad Homepage , DGA & kettenkrad.com, kettenkrad, kettenkraftrad, military vehicles
  • They are without doubt one of the most desirable military 'collectors' vehicles. Anyone riding one generally has a huge grin on his face and is accustomed to envious stares from all and sundry as they roar past in a pleasingly ground-shaking manner.
  • Don't get too excited though, prices are stratospheric, £35-45k (ish) and the lower end of that spectrum includes rusty French vineyard conversions, many seem to have gone onto serve in that area and had their front wheels removed and a conversion to run backwards (they look like little tractors). If I recall they were also manufactured postwar in this greatly altered form.
  • And yes, they were used as Airfield tractors by the Luftwaffe :D:
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Mate of mine's Passat estate was towed out by this one at a muddy Overlord show
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Lucky swine!

Cheers,
Adam.
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#6 JCFalkenbergIII

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Posted 02 April 2008 - 11:41 PM

Erich posted these links in a thread from 2004 about the Kettenrad.
kettenkrad.com, kettenkrad, kettenkraftrad, military vehicles
Die NSU Kettenkrad Homepage
NSU-Kettenkrad
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For the first time I have seen "History" at close quarters,and I know that its actual process is very different from what is presented to Posterity. - WWI General Max Hoffman.

#7 JCFalkenbergIII

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Posted 02 April 2008 - 11:46 PM

The Sonderkraftwagen (meaning 'Special Vehicle') or abbreviated as SdKfz 2 kleines Kettenrad (meaning 'half-track') was developed for the German Army and Luftwaffe airborne units as a light utility tractor (Model HK101) for towing the Pak 35/36 anti-aircraft gun.
The HK101 system was designed for one driver, positioned in a well just between the two tracks and the engine placed squarely behind him. Two passengers could be carried on the removable rear seat port or resupply items could be carried instead.
Upon incurring huge losses on the island of Crete, the Luftwaffe troops now found themselves fighting as a regular army, with little use for their light artillery/ Thusly, the Kettenrad lost its primary role of transporting artillery for the paratroopers and was now instead relegated to be used strictly as a supply tractor.
Towing capacity was limited to 992 lbs, but the little system could navigate mud, rock and sand in areas where larger machines could not. Few Kettenrads were eventually built, and most were held in reserve for the most difficult of resupply missions.
Eventually, the success of the smaller Kettenrad brought along the proposal of a larger version known as the Model HK102, which would feature a larger engine and the capability to carry 5 men. Unfortunately, the Kettenrad system as a whole was deemed an inessential part of the German war machine - a luxury it could do without - and thusly the HK102 never went past the design stage.
Kettenrads, though produced in low numbers, saw action through the end of the war. Several variants were modified including a cable-laying system operated by a driver and cable signaller. Two of these cable-laying variants existed as the SdKfz 2/1 and the SdKfz 2/2.
The SdKfz 2 kleines Kettenrad can be seen in action at the climax of the World War 2 motion picture Saving Private Ryan.
Specifications for the SdKfz 2 kleines Kettenrad Halftrack Motorcycle:

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Designation: SdKfz 2 kleines Kettenrad
Classification: Small-Wheel Tractor / Halftrack
Service Date: 1941
Weight: 2,646 lbs (1,200 kg)
Length: 8 feet, 11.9 inches (2.74 m)
Height: 3 feet, 3.8 inches (1.01 m)
Width: 3 feet, 3.4 inches (1.0 m)
Maximum Speed: 49.7 mph (80 km/h)
Engine: 1 x Opel Olympia 38 petrol engine generating 26.8 kW (36hp) of power
Crew: 1 + 2
Armament: None.
More Pictures of the SdKfz 2 kleines Kettenrad Moto-Halftrack:

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Profile of the SdKfz 2 kleines Kettenrad



showing off it's compact size.


SdKfz 2 kleines Kettenrad


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#8 PzJgr

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Posted 03 April 2008 - 12:01 AM

I'm currently reading Siegfried Knappe's book and in it I read a part where it was used as a courier vehicle during winter towards the end of the war.
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#9 JCFalkenbergIII

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Posted 03 April 2008 - 04:46 AM

"German Motorcycle Tractor" from Tactical and Technical Trends

The following U.S. report describes the German Kettenkrad tractor (Sd.Kfz. 2). This article originally appeared in Tactical and Technical Trends, No. 19, February 25, 1943.

[DISCLAIMER: The following text is taken from the U.S. War Department publication Tactical and Technical Trends. As with all wartime intelligence information, data may be incomplete or inaccurate. No attempt has been made to update or correct the text. Any views or opinions expressed do not necessarily represent those of the website.]

GERMAN MOTORCYCLE TRACTOR



The invasion of Crete revealed for the first time the use by the Germans of the motorcycle tractor for the purpose of hauling light, single-axle, open trailers or light guns. This tractor is known to be employed in the Middle East and, according to recent newspaper accounts, it is now to be seen on the Eastern Front. It is a suitable vehicle for accompanying airborne troops. Early in 1941, it was accepted as an army vehicle and received the number Sd.Kfz. 2 (Sonder Kraftfahrzug--special motor vehicle).
a. Body
The accompanying sketches show that the body (1) is a box-like structure made of pressed metal in two halves, and joined along a horizontal plane below the track-guards (2). It contains the driving position (3), the engine (4) and transmission, and a transverse seat (5) at the rear over the cooling system (6). The driver is seated on a saddle (7) mounted above the gearbox (8) and clutch housing (9), and has two rubber knee-pads fitted beneath the dashboard. On each side, the track-guards carry gasoline tanks (10) at the front while, level with the engine, the sides are built up (11) and contain on the left the tool kit and on the right the battery and fuze panel.
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At each side of the passenger seat there is a light rail (12), while foot rests, rifle rests (14), and clips (15) are provided at the rear.
b. Engine
The power unit (4) is an Opel "Olympia model 38," gasoline engine, mounted towards the rear of the body. It is a four-cycle, four-cylinder unit developing about 36 brake horse power at 3,400 rpm.
Bore 80 mmStroke76 mmEngine capacity1,478 ccCompression ratio6Firing order1 - 3 - 4 - 2
The engine body is in two main parts: the cylinder head, and the cylinder block and crankcase (both in one piece).
c. Crankshaft Assembly
This is supported in four main bearings. The pistons are of light metal and are fitted with two compression and one oil-scraper rings. The wrist or piston pins are full floating and are prevented from sideward movement by locking rings on each side.
d. Valve Operation
The overhead valves (one intake and one exhaust for each cylinder) are operated by pushrods and rockers from the camshaft, which is mounted in four bearings in the crankcase. The gasoline pump, tachometer, oil pump, and distributor are all driven from the camshaft.
Valve clearance (warm) Intake 0.2 mm (8/1000 in) " "Exhaust0.3 mm (12/1000 in)
e. Cooling
An impeller-type water pump, together with the generator, is driven from a master pulley on the free end of the crankshaft and circulates water between the engine and the radiator (6), which is located at the rear of the vehicle. A small water tank is mounted above the pump.
The laminated radiator is built in a large airduct (16), in which there is a fan (17) driven direct from the crankshaft. The rear end of the airduct may be closed by a flap (18) operated by a hand lever on the left of the driver.
f. Lubrication
Oil is pressure-circulated by a gear pump from the sump through a strainer and passes through the bearings of the crankshaft, connecting rods, camshaft, tappets, and valve rockers at a pressure of 30 to 45 pounds per square inch. Piston pins and cylinder walls are splash-lubricated.
In order that the oil pressure may not rise too high, there is an excess-pressure valve in the wall of the oil pump, and this returns some of the oil to the sump.
An oil cleaner of the metal-disk type is fitted. This is itself cleaned by turning the ratchet on the top.
g. Fuel-Supply
An Opel downdraft carburetor, with a large oil-bath-type air filter (19) on the air intake, is fitted. Gas is drawn from the tanks (of which there are two, each holding 5.5 U.S. gallons) and fed to the carburetor by a mechanical diaphragm pump of normal design, which is driven from the camshaft.
h. Electrical Equipment
Ignition is by Bosch coil and distributor, the latter being driven from the camshaft. A Bosch 75-watt generator, with voltage regulator, is mounted on the right side of the engine and together with the water pump is driven by a V-belt from the master pulley. A Bosch starter motor is also fitted on the right side. The 6-volt battery is mounted on the right side above the track-guard.
i. Starting Equipment
Normally the engine is started by a self-starter controlled by a pull-knob on the dashboard. A crank is also provided and, for use, is inserted in an opening in the radiator grill at the back of the vehicle (just above the trailer coupling) and pushed through to engage with the crankshaft.
j. Transmission
Transmission is through an Opel multiple-spring, single dry-plate clutch, mounted on the flywheel, to a 3-speed-and-reverse gearbox (8), which also incorporates an auxiliary gear box, giving high and low ratios so that in effect 6 forward speeds may be obtained. A long gear-shift lever (20), held near the top in a gate (the H-shaped aperture in which the gear lever operates) on the dashboard in front of the driver, gives the main gear selection, while a shorter lever (21), to the rear of the first, gives selection of high and low ratios for road or cross-country travel. A hinged latch which covers the "reverse" part of the gate prevents accidental engaging of that gear, while an extension of the latch beyond the hinge makes its removal an easy matter.
The vehicle must be stationary while changing ratio in the auxiliary gearbox.
The speedometer is driven from the gearbox.
k. Differential
The differential (22) is of the controlled spur-gear type and incorporates two steering brakes (23), one for each track. These are internal expanding, and in order to increase their braking efficiency the drums are not directly fastened to the axle shafts, but are driven at considerably greater speed from the differential spur pinions through a set of gears.
l. Sprocket
From the differential, the drive passes through the steering brakes (23) and metal couplings (24) to the final reduction gears (25), and thence to the sprockets (26). Each sprocket is a narrow twin-rimmed wheel, of which the inner and outer rims are shod with rubber pads (27) (12 per rim) to form a continuous tire. The pads have the same inside curvature as the rim, but are flat outside. Adjustable rollers (28) (12 per sprocket) are fitted between the rims to act as teeth and to engage the track. An internal expanding brake, which is foot operated, is mounted inside each sprocket.
m. Suspension
(1) Front Wheel
The front wheel (29) is a pressed-steel disk type with a 3.5- by 19-inch tire (tire pressure 34 lbs. per sq. in.) and mounted in a pressed steel, motorcycle front-wheel fork (30) of conventional pattern. The springing (two vertical coil springs) (31), with controllable friction-disk shock absorbers (32), and the steering column (33) are very similar to those of a normal motorcycle.
(2) Track Assembly
The track assembly, which is of the usual type for half-track vehicles, consists on each side of a driving sprocket (26), four equal size, double-rimmed bogie wheels (34 and 35), and an idler wheel (36). Of the bogie wheels, the odd numbers (34) (from the front) are narrow wheels with radial spokes, while the even numbers are wider, pressed-steel disk wheels. The former run between the rims of the latter, the whole bogie and idler system being set rim to axle.
The bogie wheels are mounted on bell cranks (37) fastened to torsion bars, which pass across the body of the vehicle in crosstubes (33) of circular section and are anchored in the opposite side. The torsion bars of the corresponding bogie wheels of the two sides are carried one above the other (39) in the same cross tube.
The idler is simply another narrow-rimmed bogie wheel and is carried on an eccentric arm (40) which can be adjusted by a screw rod (41) passing through a bracket on the body. By this means the position of the idler can be varied, and hence the track tension may be adjusted. The bogie and idler wheel rims have thin, solid rubber tires. There are no return rollers, the track returning along the tops of the bogie wheels.
n. Track
Each track is made up of 40 forged steel links (42) (fig. 1) joined together by a bolt (43). These link joints are lubricated from oil chambers (44) which also, in part, form the tongues of the track links and pass between the rims of the bogie wheels. Above the oil chambers and track bolts, rubber shoes (45) are mounted. These are easily replaceable, being retained by 4 screws (46) only.
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o. Steering
The motorcycle tractor is steered by the front wheel, by handlebars (47) in the normal manner of a motorcycle, and for sharp turns, by the steering brakes, operating on the tracks.
Two take-off rings (48) at the bottom of the steering column are connected by rods to arms on the brake crosstube (49). These in turn actuate levers, the ends of which are joined by means of adjustable rods to the steering brakes (23).
The steering brakes come into play for turns of over 5°, corresponding to a movement in either direction of about 1 3/4 inches at the ends of the handlebars.
p. Brakes
The footbrake, which is located on the right, and the handbrake (50) both operate an internal expanding brake mounted in each sprocket.
q. Driver's Controls and Instruments
These consist of the following:-
(1) steering handlebars with right hand throttle twist grip;
(2) main and auxiliary gear selection levers;
(3) a footpedal (51) on the left, operating the clutch;
(4) a handbrake (50) mounted on the left of the gearbox cover;
(5) a footbrake on the right;
(6) a radiator shutter control on the inside of the body, left of the driver, -
together with starter button, ignition and lighting switches, tachometer, speedometer, odometer, oil-pressure gauge, and water-temperature gauge.
r. Modifications for Tropical Use
A German document details several modifications which are made to the motorcycle tractor to fit it for use under tropical conditions.
(1) Engine
The oil filler cap has a linen hood tied over it, and the breather pipe has a steel-wool filter held between two pins near the bottom. For cleaning purposes, the filter may be removed after the lower pin has been extracted.
(2) Cooling
In order to provide sufficient cooling, the fan is driven at 1.4 times the crankshaft speed.
(3) Fuel Supply
The Opel carburetor is replaced by a Solex model, believed to be of the duplex downdraft type. A filter is incorporated between the gas tanks and the pump.
(4) Air Filter
The "Knecht Tornado" air filter fitted to the normal vehicle is replaced by a similar type of oilbath filter, incorporating a mechanical precipitator on the inlet side.
(5) Electrical Equipment
A new generator is fitted, while a solenoid-operated starter motor replaces the mechanically-operated type fitted in the normal model. The starter push button is located on the right side of the body level with the driver's seat. The distributor is enveloped in a linen bag.
(6) Transmission
Both main and auxiliary gear levers have linen hoods tied to them to cover their points of entry into the gearboxes. The breather holes in the gearboxes, the steering brakes, and the stub axle housings are all covered with cloth hoods.
(7) Tracks
For special purposes, tracks in which the links have extension plates (52) welded to their outside (figs. 2 & 3) are provided. These are probably for use in very loose sand or swampy ground.
(8) Brakes
The covers of the track brakes have extension plates welded to the upper halves to prevent the entry of sand as much as possible.
(9) Controls
The throttle twist grip is covered with a linen sheath which is tied to the grip at each end and to the handlebars, with sufficient free cloth allowed between these fastenings to permit full movement of the twist grip.
(10) Additional Equipment
A 0.4-gallon container for distilled water, and a gallon tank for radiator water are fitted.
A length of wire (16 to 20 feet) and a 13- by 16-foot tarpaulin complete the special tropical equipment of the motorcycle tractor.
s. Further Particulars
(1) Dimensions
Length, over-all 9 ft 0 inWidth, over-all3 ft 3 inHeight, over-all3 ft11 inWidth between tracks2 ft 8 in Wheelbase, from center of front wheel to center of track4 ft 5 in Length of track in contact with ground2 ft 8 inBelly clearance 9 in

(2) Weight
Without load 2,690 lbsLoaded3,470 lbsAxle load, front wheel 120 lbsLoad on tracks3,248 lbs

(3) Performance Maximum speed on roads, At 3,000 rpm 38 mph At 4,000 rpm51 mph*Trailer capacity1/2 ton (approx)Maximum gradient, loose sand Without trailer24° (45% or 1 in 2.25) With trailer12° (20% or 1 in 5)Depth of water forded1 ft 7 inFuel capacity9 galGasoline consumption, On roads17 mpg Cross-country (approx)12 mpg
* This speed, it is stated, is only to be attempted in exceptional circumstances.




Kettenkrad - German Motorcycle Tractor, WWII Tactical and Technical Trends, No. 19: February 25, 1943 (Lone Sentry)
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For the first time I have seen "History" at close quarters,and I know that its actual process is very different from what is presented to Posterity. - WWI General Max Hoffman.

#10 Otto

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Posted 03 April 2008 - 06:03 AM

A nice little vehicle, and they seem to turn up in the oddest places, in use at a Belgian fire dept, a milk delivery vehicle in Germany, or a pseudo-golf cart in the US.

I recall seeing it in Saving Private Ryan and thinking it would be great to have one, for the wife's quick trips to the grocery store.

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#11 FramerT

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Posted 03 April 2008 - 07:58 PM

JC.....Poop, thanks guys. These sites are what I was looking for. I'll bookmark them.

< Steering
The motorcycle tractor is steered by the front wheel, by handlebars (47) in the normal manner of a motorcycle, and for sharp turns, by the steering brakes, operating on the tracks.>

I was wondering if this thing had track brakes like a tank. Otto, I can picture the bagboy's
expression when Trouble says "just put the groceries in the back."Posted Image
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#12 JCFalkenbergIII

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Posted 27 December 2008 - 04:04 AM

Bump due to the new thread on this vehicle
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For the first time I have seen "History" at close quarters,and I know that its actual process is very different from what is presented to Posterity. - WWI General Max Hoffman.

#13 Za Rodinu

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Posted 27 December 2008 - 09:36 AM

Thanks a bunch, score one for sanity.

Quousque tandem abutere, Catilina, patientia nostra...


#14 JCFalkenbergIII

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Posted 27 December 2008 - 04:53 PM

Thanks. I knew that we had talked about it somewhere. I type it into search and Viola!! There it was :).
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For the first time I have seen "History" at close quarters,and I know that its actual process is very different from what is presented to Posterity. - WWI General Max Hoffman.




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