science

Spanish submarine Peral

Spanish submarine Peral 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 Spanish submarine Peral rather than just read about it. In short: Peral was the first successful submarine powered entirely by electric batteries and the first fully military-capable submarine in history. It was built by the Spanish engineer and sailor Isaac Peral for the Spanish Navy at the Arsenal de la Carraca (now Navantia).

Key takeaways

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

Reference excerpt

Peral was the first successful submarine powered entirely by electric batteries and the first fully military-capable submarine in history. It was built by the Spanish engineer and sailor Isaac Peral for the Spanish Navy at the Arsenal de la Carraca (now Navantia). The submarine was launched on 8 September 1888. She had one torpedo tube (and two torpedoes) and an air regeneration system. Her hull shape, propeller, periscope, torpedo launcher and cruciform external controls anticipated later designs. Her underwater speed was 3 knots (5.6 km/h; 3.5 mph). With fully charged batteries, she was the fastest submarine yet built. Although advanced in many ways, Peral lacked a means of charging batteries while underway, such as an internal combustion engine, thus had a very limited endurance and range. In June 1890, Peral's submarine launched a torpedo while submerged. It was also the first submarine to incorporate a fully reliable underwater navigation system. However, conservatives in the Spanish naval hierarchy terminated the project despite two years of successful tests. Her operational abilities have led some to call her the first U-boat. Peral was withdrawn from service in 1890 and is now preserved at the Cartagena Naval Museum.

Conception

Peral was first conceived on 20 September 1884, when Lieutenant Isaac Peral y Caballero wrote a paper which would become his Proyecto de Torpedero Submarino ("Project for a submarine torpedo boat"). After several studies and experiments, and having gained support from his superiors and fellow officers, Peral exposed his idea to the Spanish navy staff. He wrote a letter to the Spanish naval minister, Vice Admiral Pezuela y Lobo, in September, 1885. Pezuela called Peral to Madrid to have a personal interview with him. After the interview Pezuela agreed to finance Peral's preliminary studies in Cádiz with an initial budget of 5,000 pesetas, before launching a program to build a full-scale submarine.

The first study consisted of human breath test in an enclosure for several hours. A room of 58 m2 (620 ft2) square meters was used, with an air storage cell, loaded to 79 atmospheres and a storage capacity of 0.5 m3. In addition to instruments to measure the temperature and moisture, there was a tube to re-oxygenate the air supply to the crew through a 4 mm (0.16 in) waterproof cloak and three water buckets to maintain the moisture. Six people locked themselves inside the room; one had to leave an hour and quarter later, but the rest remained for a total of five hours, and the test was considered a total success. On 21 July 1886, the new Navy Minister, rear-admiral Beranger, decided that the project would be reviewed by the Centro Técnico de la Armada (Naval Technical Center), under the responsibility of Admiral Antequera. He considered a more complete study of the actuator necessary before undertaking the construction of the hull and the electric engine. He authorized Peral to carry out all the modifications that he thought worthwhile, granting him 25,000 pesetas. On 5 March 1887, Peral communicated that the electric motor or "depth's device", as he called it, was ready. On 17 March, the Commander in Chief of Cadiz, Florencio Montojo, who headed the technical committee overseeing the machine, requested budgeting for Peral's submarine.

Construction

… excerpt ends here. Continue reading the full article.

Illustrations

Profile of the Peral.

Worked examples

Example 1 — a first encounter with Spanish submarine Peral

Start with the simplest possible case. Write down what Spanish submarine Peral 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 Spanish submarine Peral 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 Spanish submarine Peral 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 Spanish submarine Peral

In research: Spanish submarine Peral 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 Spanish submarine Peral 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: Spanish submarine Peral is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1888 ships, 19th-century submarines, Military history of Cartagena, Spain, so understanding it makes those chapters shorter.
In everyday life: Look for Spanish submarine Peral 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 Spanish submarine Peral in 20 minutes

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

Frequently asked questions

What is Spanish submarine Peral in simple terms?

Why does Spanish submarine Peral 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 Spanish submarine Peral?

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 Spanish submarine Peral.