science

Issoire Silène

Issoire Silène 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 Issoire Silène rather than just read about it. In short: The Issoire Silène was a sailplane produced in France in the 1970s and early 1980s, intended primarily as a trainer. It was a conventional design of fibreglass construction in versions with fixed or retractable monowheel undercarriage.

Key takeaways

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

Reference excerpt

The Issoire Silène was a sailplane produced in France in the 1970s and early 1980s, intended primarily as a trainer. It was a conventional design of fibreglass construction in versions with fixed or retractable monowheel undercarriage. The aircraft featured side-by-side seating for two, with the seats slightly staggered in order to minimise fuselage width. French certification was obtained on 3 February 1978, and production began shortly thereafter at the rate of two aircraft per month. The original CE 75 design was refined as the E 78, which featured a redesigned and roomier cockpit, and was again available in fixed and retractable undercarriage versions. A further development, the I 79, was in development in 1979, and featured tanks for water ballast as well as hydraulically operated flaps, undercarriage, and airbrakes.

Specifications (CE 75 Silène) Data from Jane's all the World's Aircraft 1976–77General characteristics Crew: 2 Length: 7.95 m (26 ft 1 in) Wingspan: 18 m (59 ft 1 in) Height: 1.5 m (4 ft 11 in) Wing area: 18 m2 (190 sq ft) Airfoil: Bertin E55-166 (16.6%) Empty weight: 320 kg (705 lb) Max takeoff weight: 540 kg (1,190 lb) Performance

Stall speed: 63 km/h (39 mph, 34 kn) (single seat) 68 km/h (42 mph; 37 kn) (two seat with radio) 70.5 km/h (43.8 mph; 38.1 kn) (two seat with radio and oxygen equipment) Never exceed speed: 245 km/h (152 mph, 132 kn) Max aerotow speed: 164 km/h (102 mph; 89 kn) g limits: +5.3 (normal); +8 (ultimate) Maximum glide ratio: 36:1 at 84 km/h (52 mph; 45 kn) (single seat fixed mainwheel) 36 at 91.5 km/h (56.9 mph; 49.4 kn) (two seat with radio fixed mainwheel) 38 at 91.5 km/h (56.9 mph; 49.4 kn) (retractable mainwheel) Rate of sink: 0.59 m/s (116 ft/min) at 84 km/h (52 mph; 45 kn) (single seat) 0.64 m/s (2.1 ft/s) at 91.5 km/h (56.9 mph; 49.4 kn) (two seat with radio) 0.67 m/s (2.2 ft/s) at 91.5 km/h (56.9 mph; 49.4 kn) (two seat with radio and oxygen equipment) Wing loading: 31 kg/m2 (6.3 lb/sq ft) (max with oxygen equipment) 29 kg/m2 (5.9 lb/sq ft) (two seat with radio) 25 kg/m2 (5.1 lb/sq ft) (single seat)

References

Further reading Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 535. Jane's All the World's Aircraft 1977-78. London: Jane's Yearbooks. pp. 581–82. Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allan. p. 109. Coates, Andrew (1978). Jane's World Sailplanes and Motor Gliders. London: MacDonald and Jane's. p. 29.

Worked examples

Example 1 — a first encounter with Issoire Silène

Start with the simplest possible case. Write down what Issoire Silène 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 Issoire Silène 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 Issoire Silène 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 Issoire Silène

In research: Issoire Silène 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 Issoire Silène 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: Issoire Silène is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1970s French sailplanes, Aircraft first flown in 1974, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Issoire Silène 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 Issoire Silène in 20 minutes

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

Frequently asked questions

What is Issoire Silène in simple terms?

Why does Issoire Silène 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 Issoire Silène?

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 Issoire Silène.