science

Slingsby Eagle

Slingsby Eagle 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 Slingsby Eagle rather than just read about it. In short: The Slingsby Type 42 Eagle was a two-seat glider designed in England from 1952. Development After the end of WWII the British Gliding Association (BGA) recognised a need for two-seat training gliders to replace the unsafe and inefficient solo training techniques that were prevalent at the time, launching a competition to design a two-seat trainer.

Key takeaways

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

Reference excerpt

The Slingsby Type 42 Eagle was a two-seat glider designed in England from 1952.

Development After the end of WWII the British Gliding Association (BGA) recognised a need for two-seat training gliders to replace the unsafe and inefficient solo training techniques that were prevalent at the time, launching a competition to design a two-seat trainer. Though Slingsby did not enter the competition it spurred them to look in the early 1950s at a two-seat version of their Type 34 Sky. The advent of the NACA laminar flow aerofoil sections at that time prompted them to start from scratch, designing a large aircraft with nearly 18 m span, three-part wings and a large fuselage with spacious, comfortable cockpits. The fuselage is built up as a wooden truss with a plywood-covered stressed-skin top decking and wooden semi-monocoque forward fuselage. The cockpits are covered by two canopies, the forward one hinging to starboard and the rear hinged at the rear forming part of the leading edge, in the cut-outs provided for access to the rear seat. The wings are built up from wood with plywood covering back to the rear spar inboard of the ailerons and forward of the mainspar outboard. A rectangular constant-thickness/chord ratio centre section sits atop the fuselage out to approximately 1/5 span each side where the tapering outer wings are fitted, with the leading edge unswept. Large, effective plate-type airbrakes are fitted, aft of the mainspar, to the wings at approximately 1/3 span extending out from upper and lower surfaces. Plywood-skinned low-set tailplane and fin with fabric-covered built-up wooden elevators and rudder are at the tail end of the fuselage, the elevators fitted with trim tabs, one for longitudinal trim and one to compensate for pitch-up with operation of the airbrakes. The undercarriage comprises a single mainwheel just aft of the loaded centre of gravity with a large nose skid faired in with leather or canvas and a metal tailskid.

Variants Ellison 1971, pp. 209–210

Slingsby Type 42 Eagle 1 The first prototype fitted with a 17.86 m swept-forward wing with cutouts in the root for access to the rear seat. The prototype suffered from poor performance traced to the leading edge cut-outs. This aircraft was destroyed after a mid-air collision with a Slingsby Type 34 Sky near Lasham, Hants on 14 June 1958. Slingsby Type 42B Eagle 2 The second prototype introduced a simplified wing with no leading edge sweep-forward and the cutouts filled by the rear canopy. It won the two-seater class at the World Gliding Championships at Saint-Yan, France in 1956, piloted by Nicholas Goodhart and Frank Foster, coming second overall. This glider still flies at Devon & Somerset Gliding Club, [North Hill], England. Slingsby Type 42B Eagle 3 Production aircraft fitted with a 17.7 m wing and cockpits moved forward; fifteen built. Slingsby Type 55 Regal Eagle A single Eagle 3 (c/n 1117 / BGA 821) fitted with a 20 m span wing in 1966–67, used to break the UK two-seat goal flight record with a flight from Odiham to Perranporth (312 km) piloted by Wally Kahn and John Williamson. This aircraft was destroyed in a fire at Doncaster in March 1975.

Specifications (Eagle 3) Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde, and Bridgman 1956, p. 92, Flight (1957)General characteristics Crew: 2 Length: 27 ft 11 in (8.5 m) Wingspan: 58 ft 5 in (17.8 m) Height: 6 ft 0 in (1.83 m) Wing area: 229 sq ft (21.3 m2) Aspect ratio: 14.8 Airfoil: root:NACA 633-618, tip:NACA 4412 Empty weight: 820 lb (372 kg) Max takeoff weight: 1,239 lb (562 kg) Performance

Stall speed: 37 mph (60 km/h, 32 kn) Never exceed speed: 147 mph (237 km/h, 128 kn) Rough air speed max: 83 mph (134 km/h; 72 kn) Aerotow speed: 83 mph (134 km/h; 72 kn) Winch launch speed:83 mph (134 km/h; 72 kn) g limits: +7.5 - 3.8 at 71 mph (115 km/h; 62 kn) Maximum glide ratio: 31.5 at 52 mph (83 km/h; 45 kn) Rate of sink: 132 ft/min (0.67 m/s) at 44 mph (71 km/h; 38 kn) Wing loading: 5.4 lb/sq ft (26.4 kg/m2)

Illustrations

Worked examples

Example 1 — a first encounter with Slingsby Eagle

Start with the simplest possible case. Write down what Slingsby Eagle 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 Slingsby Eagle 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 Slingsby Eagle 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 Slingsby Eagle

In research: Slingsby Eagle 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 Slingsby Eagle 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: Slingsby Eagle is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950s British sailplanes, Aircraft first flown in 1954, Glider aircraft, so understanding it makes those chapters shorter.
In everyday life: Look for Slingsby Eagle 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 Slingsby Eagle in 20 minutes

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

Frequently asked questions

What is Slingsby Eagle in simple terms?

The Slingsby Type 42 Eagle was a two-seat glider designed in England from 1952. Development After the end of WWII the British Gliding Association (BGA) recognised a need for two-seat training gliders to replace the unsafe and inefficient solo training techniques that were prevalent at the time, lau…

Why does Slingsby Eagle 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 Slingsby Eagle?

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 Slingsby Eagle.