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Wasserwerfer 9000

Wasserwerfer 9000 is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Wasserwerfer 9000 rather than just read about it. In short: The Wasserwerfer 9000 (WaWe 9, literally "Water Launcher 9000") is a water cannon used by the Federal Police (Bundespolizei) and Bereitschaftspolizei in Germany, as well as the municipal police of Switzerland. History Development The Wasserwerfer 9000, named for its 9,000 litres (2,400 US gal) capacity, was developed in the late 1970s and early 1980s by the German Federal Border Guard (Bundesgrenzschutz) to replace…

Wasserwerfer 9000 — main illustration
Wasserwerfer 9000 — illustration

Key takeaways

  • Wasserwerfer 9000 belongs to physics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Wasserwerfer 9000 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Wasserwerfer 9000 from memory before moving on to harder problems.

Reference excerpt

The Wasserwerfer 9000 (WaWe 9, literally "Water Launcher 9000") is a water cannon used by the Federal Police (Bundespolizei) and Bereitschaftspolizei in Germany, as well as the municipal police of Switzerland.

History

Development The Wasserwerfer 9000, named for its 9,000 litres (2,400 US gal) capacity, was developed in the late 1970s and early 1980s by the German Federal Border Guard (Bundesgrenzschutz) to replace previous generations of water cannons, which were not able to meet the requirements of escalated water cannon use in violent riots. Water supply was limited and vehicles were often incapacitated by rioters - these older models are no longer in official use and are instead used for training purposes. The Wasserwerfer 9000 was based solely on the four-wheel drive chassis of the Mercedes-Benz NG and later SK series, and the construction was carried out by Metz and Ziegler. The vehicle has shatterproof polycarbonate glazing (Lexan) and run-flat tires, while the higher cab allows for an improved seating arrangement, allowing for a better view for the water nozzle operators.

Usage The Bundespolizei ordered over 100 Wasserwerfer 9000s over its production run, with state police forces across Germany also operating new or second-hand examples. These were typically used for riot control, however they could also be deployed in special circumstances to fight fires and to provide drinking water in droughts and disasters. Two were also purchased by the Zürich cantonal police in Switzerland.

Replacement The use of the Wasserwerfer 9000 in riot control has been the subject of controversy. In 1985, activist Günter Sare was killed when he was run over by a Wasserwerfer 9000 that had hit him with pressurised water during a march in Frankfurt am Main. Subsequent investigations revealed that the water cannon's engine noise, cockpit layout and poor targeting controls had potentially distracted its crew. In 2011, retired engineer Dietrich Wagner was partially blinded when a blast of pressurised water from a Wasserwerfer 9000 hit his eyes during the Stuttgart 21 protests. The state of Baden-Württemberg eventually rewarded Wagner with €150,000 in compensation in 2016. In 2009, the first prototype Wasserwerfer 10000, manufactured by Rosenbauer International AG, was presented to the Bundespolizei. Since then, several federal and state riot police departments have received Wasserwerfer 10000s to replace older water cannons. By 2015, only 34 Wasserwerfer 9000s remained in service, with 6 being operated by the Bundespolizei and the remaining 28 operated by state police forces. Wasserwerfer 9000s have since been gradually decommissioned by most police departments across Germany on safety grounds, with some being donated to fire departments. Following criticism of police tactics in the 2011 England riots, Mayor of London Boris Johnson purchased three second-hand Bundespolizei Wasserwerfer 9000s in 2014 for use by the Metropolitan Police. The water cannons cost £322,000 to purchase, refurbish and repaint, with 78 faults being identified and repaired before they were to be placed into service. The Wasserwerfer 9000s were briefly used in training exercises before Home Secretary Theresa May refused to authorise their use in England and Wales. The potential use of water cannons in London was heavily criticised by members of the London Assembly and five of Britain's largest police forces, and in 2018, they were scrapped by Johnson's successor Sadiq Khan for £32,000 in scrap value. No water cannons have been used in the United Kingdom with the exception of Northern Ireland, where six vehicles built by GINAF are in use with the Police Service of Northern Ireland.

Operation

To operate the Wasserwerfer 9000 a crew of at least four officers is required:

One commander One driver Two operators, one for each roof nozzle A fifth seat is available in the cab for observers, drivers, etc. A machinist is no longer needed, as the pump motor located in the rear is operated by the place of the commander. By this separate pump motor, water discharge can be carried out regardless of the driving condition and is not like the power take-off which is linked to the speed of the traction motor. The water nozzles in the Wasserwerfer 4000 and Wasserwerfer 6000 were operated by muscle power; this is accomplished in the Wasserwerfer 9000 via joystick operation. The water nozzles are operated by pressing a button, while the guide seat rotates in response. The operation is done manually, however automated programs that target devices are not available. The water supply can be via a suction port from public waters or from fire hoses. Hose connections for fire-fighting tasks are also present. The valves are designed to fight against nucleation in the absorbed water, and chlorine is also added to the water to keep it clean. In use, multiple water cannons are grouped and reserve vehicles are kept, which are gradually replacing the consumption of the supply. A second water-throwing system is provided for each water-cannon. The application is often through securing forces and an armoured sweep.

Specifications

Gallery

References

Further reading Hans-Jürgen Schmidt: Wir tragen den Adler des Bundes am Rock - Chronik des Bundesgrenzschutzes 1951 – 1971 Fiedler-Verlag, Coburg 1995 ISBN 3-923434-17-0

Illustrations

Wasserwerfer 9000: A Wasserwerfer 9000 on Mercedes-Benz SK chassis in Berlin, 2009
A Wasserwerfer 9000 on Mercedes-Benz SK chassis in Berlin, 2009
Wasserwerfer 9000: A Wasserwerfer 9000 on Mercedes-Benz NG chassis in Frankfurt, 2006, retaining former Bundesgrenzschutz registration plate and livery
A Wasserwerfer 9000 on Mercedes-Benz NG chassis in Frankfurt, 2006, retaining former Bundesgrenzschutz registration plate and livery
Wasserwerfer 9000: Wasserwerfer 9000 pictured on the right beside its successor, the Wasserwerfer 10000
Wasserwerfer 9000 pictured on the right beside its successor, the Wasserwerfer 10000
Wasserwerfer 9000 illustration
Wasserwerfer 9000 illustration

Worked examples

Example 1 — a first encounter with Wasserwerfer 9000

Start with the simplest possible case. Write down what Wasserwerfer 9000 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Wasserwerfer 9000 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Wasserwerfer 9000 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Wasserwerfer 9000

In research
Wasserwerfer 9000 appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Wasserwerfer 9000 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Wasserwerfer 9000 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Law enforcement in Germany, Riot control weapons, Water cannons, so understanding it makes those chapters shorter.
In everyday life
Look for Wasserwerfer 9000 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Wasserwerfer 9000 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Wasserwerfer 9000 means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Wasserwerfer 9000 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Wasserwerfer 9000 in simple terms?

The Wasserwerfer 9000 (WaWe 9, literally "Water Launcher 9000") is a water cannon used by the Federal Police (Bundespolizei) and Bereitschaftspolizei in Germany, as well as the municipal police of Switzerland. History Development The Wasserwerfer 9000, named for its 9,000 litres (2,400 US gal) capa…

Why does Wasserwerfer 9000 matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Wasserwerfer 9000?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Wasserwerfer 9000.

Tags

  • Law enforcement in Germany
  • Riot control weapons
  • Water cannons
  • Water in Germany

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