science

Raab Krähe

Raab Krähe is a science 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 Raab Krähe rather than just read about it. In short: The Raab Krähe (English: crow) is a West German high-wing, single-seat, pusher configuration motor glider that was designed by Fritz Raab for amateur construction around 1958. Design and development Raab designed the Krähe specifically for homebuilders.

Key takeaways

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

Reference excerpt

The Raab Krähe (English: crow) is a West German high-wing, single-seat, pusher configuration motor glider that was designed by Fritz Raab for amateur construction around 1958.

Design and development Raab designed the Krähe specifically for homebuilders. The Krähe is constructed from wood, with the fuselage made from a wooden structure covered in doped aircraft fabric. The 12.0 m (39.4 ft) span wings are built with a wooden structure and covered in plywood and fabric. The wings feature spoilers and a custom Raab-designed airfoil. The tailplane is braced with four cables to the wing trailing edge. The landing gear is a fixed monowheel. The motor installation is unconventional for a motorglider in that the engine is mounted in the rear of the cabin area, with the propeller in between the top and bottom tail boom tubes. Motors used are usually of an output of about 30 hp (22 kW). About 30 examples were reported completed by 1974.

Operational history One Krähe built in Austria by Tasso Proppe and imported to the United States was powered by a 27 hp (20 kW) Steyr twin-cylinder, four-stroke engine that produced a cruise speed of 75 mph (121 km/h) on a fuel burn of 1.2 U.S. gallons (4.5 L; 1.00 imp gal) per hour. The aircraft is no longer on the US Federal Aviation Administration registry.

Variants Krähe Initial model with monowheel landing gear and propeller in between top and bottom tail boom tubes. Austria Krähe Later model with tricycle landing gear and propeller rotating around the upper tail boom tube.

Specifications (Krähe) Data from SoaringGeneral characteristics Crew: one Wingspan: 12 m (39 ft 4 in) Wing area: 14.3 m2 (154 sq ft) Aspect ratio: 10:1 Airfoil: Raab Empty weight: 238 kg (525 lb) Gross weight: 333 kg (735 lb) Fuel capacity: 8 U.S. gallons (30 L; 6.7 imp gal) Powerplant: 1 × Steyr , 20 kW (27 hp) Propellers: 2-bladed wooden fixed pitch Performance

Cruise speed: 121 km/h (75 mph, 65 kn) Endurance: 10 hours loiter Maximum glide ratio: 18-20:1 at 77 km/h (48 mph) Rate of sink: 1.2 m/s (240 ft/min) at 68 km/h (42 mph) Wing loading: 23.3 kg/m2 (4.77 lb/sq ft)

See also List of gliders Related development

Brditschka HB-3

References

Illustrations

Worked examples

Example 1 — a first encounter with Raab Krähe

Start with the simplest possible case. Write down what Raab Krähe claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Raab Krähe 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 Raab Krähe 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 Raab Krähe

In research: Raab Krähe appears in science 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 Raab Krähe 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: Raab Krähe is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950s German sailplanes, Aircraft first flown in 1958, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Raab Krähe 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 Raab Krähe in 20 minutes

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

Frequently asked questions

What is Raab Krähe in simple terms?

The Raab Krähe (English: crow) is a West German high-wing, single-seat, pusher configuration motor glider that was designed by Fritz Raab for amateur construction around 1958. Design and development Raab designed the Krähe specifically for homebuilders.

Why does Raab Krähe matter?

Because it connects several science 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 Raab Krähe?

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 Raab Krähe.