science

THK-13

THK-13 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 THK-13 rather than just read about it. In short: The THK-13 was an experimental tail-less glider built by the Turk Hava Kurumu Ucak Fabrikasi (THK) in Turkey in the late 1940s. Design and development The THK-13 was a tail-less glider, built predominantly from wood with fabric covering, with the pilot sitting in a faired open cockpit on the centre-line at mid-chord.

Key takeaways

THK-13 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect THK-13 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of THK-13 from memory before moving on to harder problems.

Reference excerpt

The THK-13 was an experimental tail-less glider built by the Turk Hava Kurumu Ucak Fabrikasi (THK) in Turkey in the late 1940s.

Design and development The THK-13 was a tail-less glider, built predominantly from wood with fabric covering, with the pilot sitting in a faired open cockpit on the centre-line at mid-chord. The aircraft was controlled through ailerons on the inner portion of the trailing edges with pitch control through elevators outboard of the fins, situated at approximately ¾-span giving yaw control and stability. The undercarriage was of the mono-wheel type, common to many gliders, but with outrigger wheel struts in the lower fins keeping the aircraft level when on the ground.

Operational history To validate the design a 10% scale model was attached to a THK-5 and used as a flying wind tunnel, to validate the design values. The THK-13 was initially planned to have a small piston engine or turbojet, but was completed as a glider, principally launched by aero-tow behind a Focke-Wulf Fw 44. The first flight took place in mid 1948, flown by Kadri Kavukçu, lasting for around 30 minutes. Modifications were carried out before the next flight in August 1948, flown by Cemal Uygun. The aircraft took-off, but at 150–200 m (490–660 ft) the right wing dropped, caused by a control restriction, so Uygun carried out an emergency landing, with the aircraft suffering some damage. Repairs were carried out and flight tests resumed, revealing poor yaw stability and heavy rudder forces. The rudders were reduced in area shortly before the THK-13 was exhibited at the 1949 Paris Air Show. Further development of the THK-13 was abandoned when THK's priorities were re-aligned.

Specifications (THK-13) Data from General characteristics Crew: 1 Length: 5.04 m (16 ft 6 in) Wingspan: 20 m (65 ft 7 in) Height: 1.94 m (6 ft 4 in) Wing area: 34.5 m2 (371 sq ft) Sweepback: 20° Washout: -4° Aspect ratio: 11.6 Empty weight: 430 kg (948 lb) Gross weight: 520 kg (1,146 lb) Performance

Stall speed: 48 km/h (30 mph, 26 kn) Rate of sink: 0.96 m/s (189 ft/min) Lift-to-drag: 24:1

References

Further reading Bridgman, Leonard, ed. (1949). Jane's all the World's Aircraft 1949-50. London: Sampson Low, Marston & Co. p. 183c.

External links photographs [1]

Worked examples

Example 1 — a first encounter with THK-13

Start with the simplest possible case. Write down what THK-13 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 THK-13 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 THK-13 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 THK-13

In research: THK-13 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 THK-13 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: THK-13 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1940s Turkish civil aircraft, Aircraft first flown in 1948, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for THK-13 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 THK-13 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what THK-13 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 THK-13 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is THK-13 in simple terms?

The THK-13 was an experimental tail-less glider built by the Turk Hava Kurumu Ucak Fabrikasi (THK) in Turkey in the late 1940s. Design and development The THK-13 was a tail-less glider, built predominantly from wood with fabric covering, with the pilot sitting in a faired open cockpit on the centre…

Why does THK-13 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 THK-13?

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 THK-13.