science

Payen Arbalète

Payen Arbalète 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 Payen Arbalète rather than just read about it. In short: The Payen Arbalète (English: Crossbow) was a small, pusher configuration, experimental French tailless aircraft, designed by Nicolas Roland Payen, and first flown in 1965. Design and development Though there were significant changes during its development, the Arbalète's basic, unusual configuration remained unaltered.

Key takeaways

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

Reference excerpt

The Payen Arbalète (English: Crossbow) was a small, pusher configuration, experimental French tailless aircraft, designed by Nicolas Roland Payen, and first flown in 1965.

Design and development Though there were significant changes during its development, the Arbalète's basic, unusual configuration remained unaltered. It was a low wing cantilever monoplane resembling a cropped double delta in plan, with a short fuselage ending at the pusher engine and propeller. The centre section of the wing was strongly swept and of very broad chord, extending from the engine to the cockpit. Swept fins were placed at the outer end of the centre section and beyond them the wings were much less strongly swept, with blunt tips. The Arbalète had a fixed tricycle undercarriage. The first version of the Arbalète was the Pa.60 which made its first flight on 5 June 1965. It was powered by a 105 hp (78 kW) Hirth HM 504 air-cooled, four cylinder, inverted inline engine, which was totally enclosed within the flat sided fuselage with no side-scoops for cooling air, an arrangement which led to overheating. Its swept, straight edged fins were placed with their leading edges on the wing leading edges; they extended beyond the wing trailing edge via rounded tips to rudders with swept, curved trailing edges and trim tabs. The two side-by-side seats were enclosed by a long, wide two piece canopy. The main undercarriage legs of the Pa.60 Arbalète were located near the wing leading edge, immediately under the fins. After the cooling problems and some issues concerning the undercarriage had been resolved, the same aircraft flew as the Pa.61B Arbalète but proved to be underpowered with the Hirth engine. As a result, a new machine, the Pa.61F Arbalète II, was built, powered by a 180 hp (134 kW) Lycoming O-360 air-cooled flat-four engine with side air intakes on the semi-monocoque, circular cross-section fuselage. The Arbalète II's cockpit was large enough to hold three. The mid-span fins were different, slightly straight tapered, mounted on the trailing edge and extending below it. Below the rudders they carried airbrakes. The slight sweep on the centre wing section trailing edge has led to a description of the wing plan as "crescent" rather than delta. A narrow continuation of the leading edge of the wing to the nose formed strakes on each side. There were control surfaces on the trailing edges both within and beyond the fins. The Arbalète II's main undercarriage legs were moved inboard, mounted on the wing but close to the fuselage. The Arbalète II flew for the first time on 5 August 1970. The flight was satisfactory up to an over fast landing, when it was damaged. It was rebuilt but its subsequent history is obscure. Several proposed developments were abandoned.

Variants Pa.60 Arbalète 78 kW (105 hp) Hirth HM 504 engine. Pa.61B Arbalète Improved engine cooling and landing gear. Pa.61F Arbalète II 134 kW (180 hp) Lycoming O-360 engine. Other changes described above. Pa.61G Arbalète II Proposed version, similar to Pa.61F but with retractable foreplanes instead of rudder airbrakes and forward fuselage strakes. Pa.61H Arbalète II Proposed twin 160 kg (353 lb) Turbomeca Palas turbojet version, otherwise like Pa.61F but without strakes. Pa.610 Arbalète III Proposed four seat version with retractable gear and 149 kW (200 hp) engine.

Specifications (Pa.61F Arbalète II) Data from Jane's All the World's Aircraft 1973-74, pp.75-6. Performance figures are estimates at maximum take-off weight.General characteristics Crew: Two or three Length: 6.20 m (20 ft 4 in) Wingspan: 8.25 m (27 ft 1 in) Height: 2.35 m (7 ft 9 in) Wing area: 15.00 m2 (161.5 sq ft) Empty weight: 500 kg (1,102 lb) Max takeoff weight: 960 kg (2,116 lb) Powerplant: 1 × Lycoming O-360 air-cooled flat-four, 130 kW (180 hp) Propellers: 2-bladed Performance

Maximum speed: 330 km/h (210 mph, 180 kn) Cruise speed: 300 km/h (190 mph, 160 kn) Range: 900 km (560 mi, 490 nmi) Take-off run: 200 m (656 ft) Landing speed: 115 km/h (71 mph; 62 kn) Landing run: 265 m (869 ft)

References

Bibliography Pelletier, Alain J. (March–April 1997). "Paper Darts to Deltas: The Designs of Roland Payen". Air Enthusiast. No. 68. pp. 33–44. ISSN 0143-5450. Roux, Robert J. (January 1970). "Les avions Payen (3)" [Payen Aircraft, Part 3]. Le album de fanatique de l'Aviation (in French) (7): 2–4. ISSN 0757-4169.

External links Photo of the Payen PA-61 Arbalète

Illustrations

Worked examples

Example 1 — a first encounter with Payen Arbalète

Start with the simplest possible case. Write down what Payen Arbalète 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 Payen Arbalète 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 Payen Arbalète 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 Payen Arbalète

In research: Payen Arbalète 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 Payen Arbalète 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: Payen Arbalète is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1960s French experimental aircraft, Aircraft first flown in 1965, Payen aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Payen Arbalète 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 Payen Arbalète in 20 minutes

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

Frequently asked questions

What is Payen Arbalète in simple terms?

The Payen Arbalète (English: Crossbow) was a small, pusher configuration, experimental French tailless aircraft, designed by Nicolas Roland Payen, and first flown in 1965. Design and development Though there were significant changes during its development, the Arbalète's basic, unusual configuratio…

Why does Payen Arbalète 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 Payen Arbalète?

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 Payen Arbalète.