biology

Lockheed XP-49

Lockheed XP-49 is a biology 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 Lockheed XP-49 rather than just read about it. In short: The Lockheed XP-49 (company Model 522) was an advancement on the P-38 Lightning for a fighter in response to U.S. Army Air Corps proposal 39-775.

Key takeaways

Lockheed XP-49 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lockheed XP-49 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lockheed XP-49 from memory before moving on to harder problems.

Reference excerpt

The Lockheed XP-49 (company Model 522) was an advancement on the P-38 Lightning for a fighter in response to U.S. Army Air Corps proposal 39-775. Intended to use the new 24-cylinder Pratt & Whitney X-1800 engine, this proposal, which was for an aircraft substantially similar to the P-38, was assigned the designation XP-49, while the competing Grumman Model G-46 was awarded second place and designated XP-50.

History Ordered in October 1939 and approved on January 8, 1940, the XP-49 was to feature a pressurized cockpit and armament of two 20 mm (0.79 in) cannon and four .50 in (12.7 mm) machine guns. Two months into the contract, a decision was made to substitute the Continental XI-1430-1 (or IV-1430) for the X-1800. The XP-49, 40-3055, first flew on 11 November 1942. The prototype force-landed on 1 January 1943, when the port landing gear failed to lock down due to combined hydraulic and electrical system failures. The XP-49 next flew 16 February 1943, after repairs were made. Preliminary flight data showed performance was not sufficiently better than the production P-38, especially given the questionable future of the XI-1430 engine, to warrant disruption of the production line to introduce the new model aircraft. Consideration of quantity production was therefore abandoned. The aircraft was flown to Wright Field, and after various problems, further work on the XP-49 was halted, and Lockheed focused their energies on improving the P-38 instead.

Specifications (XP-49) General characteristics

Crew: One Length: 40 ft 1 in (12.2 m) Wingspan: 52 ft 0 in (15.8 m) Height: 9 ft 10 in (3.0 m) Wing area: 327.5 sq ft (30 m2) Empty weight: 15,410 lb (6,990 kg) Gross weight: 18,750 lb (8,505 kg) Powerplant: 2 × Continental XI-1430-1 inverted V-12s, 1,600 hp (1,193 kW) each Performance

Maximum speed: 406 mph (653 km/h, 353 kn) 15,000 ft (4,570 m) Range: 679 mi (1,093 km, 590 nmi) Rate of climb: 3,300 ft/min (16.8 m/s) Armament

2 × 20 mm (.79 in) cannons 4 × 0.5 in (12.7 mm) machine guns

Illustrations

Worked examples

Example 1 — a first encounter with Lockheed XP-49

Start with the simplest possible case. Write down what Lockheed XP-49 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Lockheed XP-49 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 Lockheed XP-49 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 Lockheed XP-49

In research: Lockheed XP-49 appears in biology 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 Lockheed XP-49 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: Lockheed XP-49 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1940s United States fighter aircraft, Aircraft first flown in 1942, Aircraft with retractable tricycle landing gear, so understanding it makes those chapters shorter.
In everyday life: Look for Lockheed XP-49 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 Lockheed XP-49 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lockheed XP-49 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 Lockheed XP-49 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lockheed XP-49 in simple terms?

The Lockheed XP-49 (company Model 522) was an advancement on the P-38 Lightning for a fighter in response to U.S. Army Air Corps proposal 39-775.

Why does Lockheed XP-49 matter?

Because it connects several biology 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 Lockheed XP-49?

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 Lockheed XP-49.