シャドーイング練習: The BMW Engine Born From Racing🏎️ | Explained Ep.43 - 動画で英語スピーキングを学ぶ
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The V10.
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It creates an unmistakable harmony that erupts from its cylindrical pipes and travels through the medium of air to vibrate our eardrums.
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It is inherently flawed by the laws of physics, two banks of five cylinders in a perpetual fight against each other trying to rip itself apart.
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But with engineering, it somehow just works.
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In 1997, BMW's motorsport division would begin a journey into mastering the art of the V10 with one goal in mind.
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their V10s on the podium in the pinnacle of motorsports, Formula 1.
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What would emerge from this expensive endeavor was infrastructure, tooling, and processes to not just build record-setting V10s for Formula 1,
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but also a V10 for a road car wearing an M badge.
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It wasn't a reworked lower trim engine with higher outputs.
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It had no lineage or connection to the series production engines of the past.
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It was the dawn of a new era, an era that now revved above 8000 RPM from the factory.
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In this episode of explain we will detail the journey of
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how BMW's quest to take down Ferrari in F1 birthed the most infamous sedan of all time.
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The BMW of today has no interest in Formula 1.
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But in the 80s, they built a turbocharged F1 engine
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that can be regarded as one of the most powerful engines ever put into an F1 car.
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It was the brainchild of Paul Roche, technical director of BMW Motorsport, and it was a fascinating piece of engineering.
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A 1.5 liter dual overhead cam four-cylinder engine based on a common iron block architecture
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that made 1300 horsepower and qualifying trim of 5.5 bar boost pressure from the triple K turbo.
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It was a force to be reckoned with in the Brabham BT52 designed by Gordon Murray,
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propelling Brazilian driver Nelson Piquet to a Formula One World Championship in 1983.
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The power of the M12 did come at a cost.
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The turbo lag was essentially an on and off switch.
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It consumed fuel like no other, and at nearly 1,000 horsepower per liter,
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the engine was pushed to its structural limits, and reliability was concerning.
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As other teams quickly caught up through the years, BMW Motorsport withdrew as an engine supplier from F1 at the end of 1986.
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a world championship, 9 wins, 15 pole positions, and 14 fastest laps under its belt with the M12.
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And the subsequent ban on turbocharged engines put the nail in the coffin for BMW's Formula One efforts for a decade.
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The rumblings of BMW re-entering the arena of Formula 1 were solidified in September of 1997.
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Paul Roche and Gordon Murray's collaboration on the McLaren F1's S70 V12 gave promise to a new engine for Formula 1.
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And despite having a free choice of the number of cylinders,
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all the manufacturers eventually ran naturally aspirated V10 engines under the 3000cc FIA regulation for F1.
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The V10 design was an engineering nightmare.
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Two banks of five cylinders that aren't naturally balanced like a V12, putting harmonics into the chassis.
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The ideal bank angle of a V10 is 72 degrees,
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since a V10 fires 10 times during 720 degrees of crankshaft rotation for a four-stroke cycle.
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But the 72-degree bank angle made the engine taller, giving it a higher center of gravity.
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Ferrari tackled this problem by using a 90 degree Banekegel V10 on the Tipo 049, giving it a lower center of gravity,
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helping handling characteristics and tuning out the harsher harmonics with an endless engineering budget at their disposal.
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The first BMW F1 V10,
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the E41, was ready in the year 2000 with an output of 810 horsepower in the Williams BMW FW22,
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and placed Williams third in the Constructors' Championship,
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behind McLaren and Ferrari, which was promising for a company 10 years behind in F1 experience.
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The second iteration, the BMW P80 V10, had a 90 degree bank angle just like Ferrari, and it was lighter by 12 kilograms, a lower center of gravity,
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and rev higher to 18,000 RPM and made 880 horsepower.
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And in the Williams FW23, it won four races, making it an improvement, but still placing third in the Constructors' Championship.
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Juan Pablo Montoya, you were going very well then, and then a lot of smoke under the engine.
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Yeah, I was a bit disappointed because it was a very good race, to be honest.
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It was a bit too great in the start, I went straight through.
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But, you know, it's fine, you know, everything is free and I'm pretty happy with the result.
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The P82, the P83, and P84 were incremental changes, making them lighter and more powerful.
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But Ferrari and Michael Schumacher were on a generational run, winning back-to-back driver's championships for half a decade.
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The hundreds of millions poured into Formula One by BMW resulted in no driver or constructor wins.
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But from it came an F1 foundry built for light alloy
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castings with maximum precision an in-house electronics department containing a prototype production facility and a team of engineers at their disposal.
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This would lay the groundwork for a new project, bringing F1 engineering into a road car.
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During the F1 development years, the replacement to the E39 chassis 5 series was underway.
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Daveed Archangeli, under the guidance of BMW Chief of Design Chris Bangle, designed a revolution to the 5 series rather than an evolution.
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A big risk with the potential of lots of reward.
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Only days after the new E65 series design was greenlit by the board, Archangeli died of leukemia.
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What he would miss out on was seeing his design become the next M5.
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In secret, BMW developed a new V10, dubbed the S85B50 for the E60.
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It was more than just inspired by its F1 program.
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It would use advancements learned in the crucible of F1.
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The V10 had a 90 degree bank angle, just like the P8X series of engines, to lower the center of gravity.
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It used an alucil alloy two-piece block with a bed plate like the E41 V10 from the early years for rigidity.
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The crankshaft was nitrocarburized, a technology learned in the F1 program, and the connecting rods were steel versus titanium,
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and the pistons were cast aluminum units with coated skirts from the carbon coating program and produced 12 to 1 compression.
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A dual overhead cam design with four valves per cylinder with
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titanium alloy exhaust valves to withstand the heat was an obvious choice,
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and carried over double vanos technology with 60 degrees of intake variation and 37 degrees of exhaust variation.
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10 individual throttle valves control the air supply hidden by an air intake plenum for each cylinder bank.
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The exhaust manifolds were hydroformed with an equal length 5-in-to-1 collector.
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It made over 507 metric horsepower at 7,750 rpm and revved all the way to an 8,250 rpm redline.
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The over square bore and stroke configuration didn't give it copious amounts of torque,
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but with seven tightly spaced gear ratios in the Getrac 247 SMG transmission,
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it didn't need it.
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The new M5 was quickly followed by an M6 Coupe.
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The M6 weighed a tiny bit less than the M5,
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but both were heavy executive German cars when compared to the E46 M3 and other brands like the Porsche 911.
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They weren't meant for the Nürburgring, they were meant for the Autobahn.
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188, 190 miles per hour, 92, 194, and now we have to slow down and see how fantastic those brakes are.
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With the M Drivers package, it could reach a still restricted speed of 305 kilometers an hour.
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And unrestricted, it could touch 320 kilometers an hour.
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In its debut, the M5 was the fastest sedan you could buy.
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The M5 and M6 were the final boss of German over-engineered machines,
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and over time, the concept of F1 tech for the road proved to be an expensive endeavor for not just its owners, but BMW themselves.
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During the four-year 80,000-kilometer warranty period, many M5s and M6s incurred issues,
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leading to updates throughout its lifespan and many warranty claims for engines and transmissions.
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The high pressure oiling system for the variable valve timing in early production cars was known to fail,
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leading to a service bulletin to replace the internal line on the pump with an uprated unit.
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The oil pan was updated with a twin drain plug design for more complete drainage during oil change intervals.
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The vano solenoids were eventually upgraded to better units in 2006, but most expensive of all was a rod bearing premature wear concern on the S-85.
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The bearing clearance from the factory was extremely tight and designed for a high zinc content engine oil.
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But with a recommended oil change interval of 15,000 miles or 24,000 kilometers,
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the oil would break down prematurely from degradation and fuel contaminants from the combustion process leading to premature wear.
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This issue was exacerbated by oil manufacturers reducing the amount of zinc additive in oils to protect the catalytic converter,
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which created a recipe for disaster on an engine with such tight tolerances.
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Simply put, as the cars aged and depreciated, they became enticing on the second-hand market for their F1 drivetrains.
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But servicing them properly became so expensive
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that they became just as infamous as early 2000s Ferraris when it came to the ownership experience.
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The legacy of the S85 V10 could have been even more groundbreaking than it already was.
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That is, if BMW Motorsports followed through with their CSL prototypes in 2009.
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This new engine was dubbed the S85 B55.
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It was stroked from 5L to 5.5L with a massive one-piece carbon intake plenum
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and made an estimated 600bhp with an 8750rpm redline.
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The CSL replaced the SMG3 with the E9X M3 dual clutch transmission, which was light years faster.
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On the M5 CSL it had a carbon roof that shed 100lbs
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and used the 167M wheels that were forged and lighter than the 166 M wheels.
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Altogether it shaved over 20 seconds off its Nurburgring lap time, and then BMW went quiet.
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No concept, no trickle down of parts like the carbon intake, no anything.
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In the grand scheme of BMW M5s, the E60 generation is a clear outlier.
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It was too outlandish to be considered a businessman's express.
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It was a Ferrari-esque attempt to use F1 as a marketing ploy to sell cars,
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even using the Porsche 911 and Lamborghini Gallardo as benchmarks for comparison in official documentation.
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The F10 M5 was more civilized, more business, faster, and laid the framework for BMW's future.
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But the E60 explored the what ifs.
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What if an F1 derived V10?
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What if an 8250 RPM redline?
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What if rod bearings were a maintenance item?
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Today BMW has no real interest in competing in F1, but I remember when they did, and the world hasn't been the same since.
動画の背景とコンテキスト
この動画では、BMWのV10エンジンの誕生とフォーミュラ1での歴史について詳しく説明されています。1997年にモータースポーツ部門が始めたV10開発の journey は、フォーミュラ1での優勝を目指すものであり、その成果は路上走行可能なMバッジの車両にも影響を与えました。工学的な課題を克服しながら進化したV10エンジンの物語は、技術と情熱の結晶であり、英語での説明も専門用語が多く、リスニングやスピーキングの練習に最適です。
日常コミュニケーションに使えるトップ5フレーズ
- "It creates an unmistakable harmony" - 「間違いのない調和を生み出す」。物事の特徴を説明する際に使えます。
- "It was a force to be reckoned with" - 「無視できない力であった」。強力な存在を表現するフレーズ。
- "The power came at a cost" - 「その力には代償があった」。メリットとデメリットを述べる時に便利です。
- "It was a fascinating piece of engineering" - 「魅力的な工学の産物であった」。技術的なものを称賛する際に使用。
- "I was a bit disappointed" - 「少し失望した」。感情を表す基本的なフレーズ。
動画を使ったシャドーイングのステップバイステップガイド
この動画は専門用語が多く、スピードも速いため、shadowing site などを使って練習するのが効果的です。まず、動画を1.25倍速で聴き、全体の流れを把握します。次に、重要なフレーズ（上記の5つなど）を選び、1文ずつ繰り返し聴きながら即座に追って話します。動画で英語学習する際は、発音の抑揚やリズムに注目し、口の動きも真似ることがポイントです。
特にIELTSスピーキング対策を目指す方は、専門用語の発音と説明の構造を学ぶことで、論理的な話し方が向上します。shadowspeaks や shadowspeak のような方法を使い、毎日10分程度の練習で、聴解とスピーキングのスキルを同時に磨くことができます。難しい部分は何度も繰り返し、自分の言葉でまとめるステップを加えると、理解が深まります。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。