science

Siren Edelweiss

Siren Edelweiss 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 Siren Edelweiss rather than just read about it. In short: The Siren C.30 Edelweiss (or C.30S) is a 15 m span, Standard Class sailplane designed in France in the early 1960s. The Edelweiss came second in its class at the 1963 World Gliding Championships (WGC) and first in its class two years later.

Key takeaways

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

Reference excerpt

The Siren C.30 Edelweiss (or C.30S) is a 15 m span, Standard Class sailplane designed in France in the early 1960s. The Edelweiss came second in its class at the 1963 World Gliding Championships (WGC) and first in its class two years later. Several are still flying in France and elsewhere in 2010.

Design and development The Edelweiss is a 15 m class, single seat, shoulder wing sailplane with a butterfly tail, built mostly from wood. The wing has a single spar and is skinned with 8 mm foam-bonded plywood. It has almost constant chord; it had forward sweep on the two prototypes but production Edelweiss have unswept wings. The ailerons are metal and are shorter on production aircraft. Inboard airbrakes, again shorter in production aircraft, can extend from both upper and lower surfaces. The butterfly tail consists of two all moving surfaces, with wood sandwich leading edges and fabric covering elsewhere. Both carry trim tabs. The slender fuselage is assembled from two formed, foam-bonded ply shells, each with inbuilt longerons. Nose and tail cones are of laminated plastic. The pilot sits in a semi-reclining position, under a long, starboard hinged, canopy which ends at the wing leading edge. The prototypes had longer noses than later aircraft. The Edelweiss lands on a fixed, sprung, monowheel undercarriage, fitted with a wheel brake operated jointly with the airbrakes. The Edelweiss flew for the first time on 25 September 1962. An initial production batch of 15 was begun in January 1965.

Operational history The two Edelweiss prototypes competed in the 1963 WGC, held at Junin, Argentina and were placed 2nd and 17th in the Standard Class, piloted respectively by J. Lachney and C. Labar. At the next WGC, held in 1965 at South Cerney, UK, two production aircraft finished in 1st and 7th place in their class, piloted by François Louis Henry and J. Lachney; two others were placed 8th and 10th (pilots J.-P. Cartrey and J. Penaud) in the Open Class (unrestricted span). 51 Edelweiss have appeared on the French civil register. As of mid-2010, 12 Edelweiss remained on the French register and 1 on each on the registers of Belgium and Monaco; at least 3 are not active. Another is on the US register.

Variants Siren-Bertin C.34 Edelweiss IV Open Class version with 17.50 m span and retractable wheel. Two built.

Specifications (C.30S) Data from Jane's All the World's Aircraft 1966/7General characteristics Crew: 1 Length: 7.39 m (24 ft 3 in) Wingspan: 15.00 m (49 ft 3 in) Wing area: 12.5 m2 (135 sq ft) gross Aspect ratio: 18 Empty weight: 238 kg (525 lb) Max takeoff weight: 380 kg (838 lb) Performance

Maximum speed: 225 km/h (140 mph, 121 kn) in smooth air Stall speed: 65 km/h (40 mph, 35 kn) approximately Maximum glide ratio: 36:1 at 95 km/h (59 mph) Rate of sink: 0.65 m/s (128 ft/min) at 145 km/h (90 mph)

References

Illustrations

Worked examples

Example 1 — a first encounter with Siren Edelweiss

Start with the simplest possible case. Write down what Siren Edelweiss 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 Siren Edelweiss 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 Siren Edelweiss 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 Siren Edelweiss

In research: Siren Edelweiss 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 Siren Edelweiss 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: Siren Edelweiss is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1960s French sailplanes, Aircraft first flown in 1962, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Siren Edelweiss 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 Siren Edelweiss in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Siren Edelweiss 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 Siren Edelweiss out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Siren Edelweiss in simple terms?

Why does Siren Edelweiss 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 Siren Edelweiss?

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 Siren Edelweiss.