Shock cooling

Shock cooling refers to the theory that damage to engines (particularly air-cooled aviation piston engines) may occur because of an excessively rapid decrease in temperature.

The situation where rapid cooling arises is on descent from altitude. In this condition, less power is demanded of the engine (it is throttled back) so it is developing much less heat. In a descent, the plane's airspeed increases, simultaneously increasing the cooling rate of the engine. As metals expand and contract under temperature changes, dimensional changes in the engine may exceed tolerance limits.

Manifestation

Damage from shock cooling is most commonly believed to manifest itself as stuck valves,^[1] excessively worn^[2] or cracked^{[citation needed]} pistons and cracked cylinders^[3] and cylinder heads.^[2]

Analysis

While the subject is very controversial, some believe shock cooling, as commonly explained, is nothing but a myth. This position is supported by the fact twin engine planes commonly experience ideal conditions for shock cooling during simulated, single engine failures, yet statistically show no difference in wear or damage probability distribution between engines. Doubts have been raised regarding the plausibility of achieving the temperature reduction in cylinder heads during flight that is purported to cause damage in most engines. Equally, it has been pointed out the rate cylinder head temperatures drop off after a normal engine shutdown is often much faster than the usual rates deemed to present a shock cooling risk.^[4] Complicating the analysis^{[citation needed]}, high operating temperatures in of themselves, can contribute to excessive component wear and damage, which is typically associated with "shock cooling".

Detection and prevention

A single cylinder head temperature (CHT) sensor, or in more sophisticated installations, an array of sensors, one for each cylinder, may be employed to monitor the temperature and cooling rate of the engine. Spoilers on the wings may also be deployed to lose lift without having to reduce engine power substantially, slowing the rate of engine cooling.^[3]

Notes and references

^ "Shock Cooling: Myth or Reality?". 19 February 1997.
^ ^a ^b "How to Avoid Sudden Cooling of Your Engine". Lycoming. Retrieved 17 July 2023.
^ ^a ^b Bedell, Peter A. (5 November 1996). "Shock Therapy". www.aopa.org.
^ "Shock Cooling: Time To Kill The Myth". AVweb. 4 January 2018. Retrieved 17 July 2023.

Aircraft piston engine components, systems and terminology

Piston engines

Mechanical components	Camshaft Connecting rod Crankpin Crankshaft Cylinder Cylinder head Gudgeon pin Hydraulic tappet Main bearing Obturator ring Oil pump Piston Piston ring Poppet valve Pushrod Rocker arm Sleeve valve Tappet
Electrical components	Alternator Capacitor discharge ignition Dual ignition Electronic fuel injection Generator Ignition system Magneto Spark plug Starter
Terminology	Air-cooled Aircraft engine starting Bore Compression ratio Dead centre Engine displacement Four-stroke engine Horsepower Ignition timing Manifold pressure Mean effective pressure Naturally aspirated Monosoupape Overhead camshaft Overhead valve engine Rotary engine Shock cooling Stroke Time between overhauls Two-stroke engine Valve timing Volumetric efficiency

Propellers

Components	Propeller governor Propeller speed reduction unit Spinner
Terminology	Autofeather Blade pitch Constant-speed Contra-rotating Counter-rotating Scimitar Single-blade Variable-pitch

Engine instruments

Engine controls

Fuel and induction
system

Other systems

Read other articles:

Anse aux Pins

Lokasi distrik Anse aux Pins di Pulau Mahé, Seychelles Anse-aux-Pins adalah sebuah distrik administratif di Seychelles yang berlokasi di pulau Mahé. Lihat pula Pulau Mahé lbsDistrik di SeychellesVictoria Raya/Mahé TengahBel Air · Les Mamelles · Mont Buxton · English River · Mont Fleuri · Plaisance · Saint Louis · Roche CaimanMahé UtaraAnse Etoile · Beau Vallon · GlacisMahé TimurAnse aux Pins · Au Cap (dulu Anse Louis) · C...

Echague

Peta menunjukan lokasi Echague Data sensus penduduk di Echague Tahun Populasi Persentase 199556.119—200061.1011.84%200767.5531.39% Echague adalah munisipalitas yang terletak di provinsi Isabela, Filipina. Pada tahun 2010, munisipalitas ini memiliki populasi sebesar 72.462 jiwa atau 13.692 rumah tangga. Pembagian wilayah Secara administratif Echague terbagi menjadi 64 barangay, yaitu: Angoluan Annafunan Arabiat Aromin Babaran Bacradal Benguet Buneg Busilelao Caniguing Carulay Castillo Damman...

Princess Yang Kwei Fei

1955 Kenji Mizoguchi film Princess Yang Kwei FeiTheatrical release posterDirected byKenji MizoguchiWritten byChing DoeMatsutaro KawaguchiYoshikata YodaMasashige NarusawaProduced byMasaichi NagataRun Run ShawStarringMachiko KyōMasayuki MoriSō YamamuraEitarō OzawaCinematographyKohei SugiyamaEdited byKanji SuganumaMusic byFumio HayasakaProductioncompaniesDaiei FilmShaw & SonsDistributed byDaiei FilmShaw & SonsRelease date 3 May 1955 (1955-05-03) (Japan) [1]&...

العلاقات الأوغندية البوتانية

العلاقات الأوغندية البوتانية أوغندا بوتان أوغندا بوتان تعديل مصدري - تعديل العلاقات الأوغندية البوتانية هي العلاقات الثنائية التي تجمع بين أوغندا وبوتان.[1][2][3][4][5] مقارنة بين البلدين هذه مقارنة عامة ومرجعية للدولتين: وجه المقارنة أو�...

Первородный грех

Об экономическом термине см. Первородный грех (экономика). ХристианствоБиблия Ветхий Завет Новый Завет Евангелие Десять заповедей Нагорная проповедь Апокрифы Бог, Троица Бог Отец Иисус Христос Святой Дух История христианства Апостолы Хронология христианства Ран�...

List of Tunisian Cup finals

Football tournamentList of Tunisian Cup finalsFounded1922RegionTunisiaCurrent championsOlympique Béja(3rd title)Most successful club(s)Espérance de Tunis(15 titles) 2023–24 Tunisian Cup The Tunisian Cup, officially named the President's Cup, is the official competition of the Cup in Tunisian football and is considered the second most important local title after the Tunisian Ligue Professionnelle 1. The first cup competition was held in the 1922–1923 season during the French occupation....

1948 World Series

1948 baseball championship series 1948 World Series Team (Wins) Manager(s) Season Cleveland Indians (4) Lou Boudreau (player/manager) 97–58, .626, GA: 1 Boston Braves (2) Billy Southworth 91–62, .595, GA: 6+1⁄2DatesOctober 6–11VenueBraves Field (Boston)Cleveland Stadium (Cleveland)UmpiresGeorge Barr (NL), Bill Summers (AL), Bill Stewart (NL), Bill Grieve (AL), Babe Pinelli (NL: outfield only), Joe Paparella (AL: outfield only)Hall of FamersIndians: Lou Boudreau Larry Dob...

Preben Elkjær Larsen

Preben Elkjær Elkjær pada Juni 2011 di Viborg (foto Lars Schmidt)Informasi pribadiNama lengkap Preben Elkjær LarsenTanggal lahir 11 September 1957 (umur 66)Tempat lahir Copenhagen, DenmarkTinggi 182 m (597 ft 1+1⁄2 in)Posisi bermain PenyerangKarier junior1963–1973 Frederiksberg BK1973–1974 KB1974–1975 Frederiksberg BKKarier senior*Tahun Tim Tampil (Gol)1976 Vanløse 15 (7)1977–1978 1. FC Köln 9 (1)1978–1984 Lokeren 190 (98)1984–1988 Verona 91 (32)198...

Список логических символов

В логике обычно используется много символов для выражения логических сущностей. Поскольку логики знакомы с этими символами, они не объясняют их каждый раз при использовании. Для студентов, изучающих логику, следующая таблица перечисляет большинство общеупотребимых си�...

Piero Capponi

For the submarine, see Italian submarine Pier Capponi. For the actor, see Pier Paolo Capponi. This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (February 2012) (Learn how and when to remove this template message) Statue of Capponi in the Loggiato of the Uffizi Piero Capponi (1447 – September 25, 1496) was an Italian statesman and military leader from Florence;...

Boeing 2707

Boeing 2707TipePesawat supersonikStatusProyek dibatalkanJumlah produksi0 Boeing 2707 merupakan sebuah pesawat yang dirancang oleh Boeing Commercial Airplanes. Pesawat ini merupakan pesawat supersonik pertama di dunia. Desain pesawat ini bersaing dengan Lockheed L-2000. Proyeknya akhirnya dibatalkan karena alasan politik, lingkungan dan ekonomi. Pranala luar NASA Innovation in Flight — NASA monograph covering projects from B-70 to Boeing and Lockheed SST designs and recent SST studies Boeing...

General Motors

Pour les articles homonymes, voir GM. General Motors GM Renaissance Center. Création 1908 Dates clés 2009 : faillite et nationalisation temporaire de l’entreprise2010 : Cession de Saab à Spyker2017 : Vente de GM Europe au groupe PSA Fondateurs William Crapo Durant et Charles Stewart Mott (en) Personnages clés William Crapo DurantKirk Kerkorian Forme juridique Entreprise privée fédérale(depuis le 2 juin 2009) Action NYSE : GM Slogan Mark of Excellence Siège socia...

Female slavery in the United States

Overview of female slavery in the United States of America See also: History of sexual slavery in the United States Part of a series onWomen in society Society Women's history (legal rights) Woman Animal advocacy Business Female entrepreneurs Gender representation on corporate boards of directors Diversity (politics) Diversity, equity, and inclusion Economic development Explorers and travelers Education Feminism Womyn Government Conservatives in the US Heads of state or government Legisl...

コルク

この記事は検証可能な参考文献や出典が全く示されていないか、不十分です。出典を追加して記事の信頼性向上にご協力ください。（このテンプレートの使い方）出典検索?: コルク – ニュース · 書籍 · スカラー · CiNii · J-STAGE · NDL · dlib.jp · ジャパンサーチ · TWL（2017年4月）コルクを打ち抜いて作った瓶の栓コルク（木栓、�...

Réaux (ruisseau)

Pour les articles ayant des titres homophones, voir Réo et Réau. Pour les articles homonymes, voir réal. le ruisseau des Réaux Caractéristiques Longueur 12,9 km Bassin collecteur Loire Régime pluvial Cours Source étang de Vignol · Localisation Gennetines · Altitude 246 m · Coordonnées 46° 37′ 15″ N, 3° 22′ 52″ E Confluence l'Allier · Localisation en limite des communes de Bagneux, Montilly et Villeneuve-sur-Allier · Altitude 197&...

W. Earl Brown

American actor, screenwriter, producer and musician (born 1963) W. Earl BrownBrown in August 2011BornWilliam Earl Brown (1963-09-07) September 7, 1963 (age 60)Golden Pond, Kentucky, U.S.EducationMurray State University (BA)DePaul University (MFA)Occupations Actor screenwriter producer musician songwriter Years active1991–presentSpouse Carrie Paschall (m. 1989)Children1 William Earl Brown (born September 7, 1963) is an American actor, screenwriter, pr...

جهاز عرض بمستوى الرأس

لمعانٍ أخرى، طالع هود (توضيح). هذه المقالة تحتاج للمزيد من الوصلات للمقالات الأخرى للمساعدة في ترابط مقالات الموسوعة. فضلًا ساعد في تحسين هذه المقالة بإضافة وصلات إلى المقالات المتعلقة بها الموجودة في النص الحالي. (فبراير 2014) HUD of an aircraft جهاز العرض بمستوى الرأس (بالإنج...

NGC 4179

NGC 4179 جزء من عنقود العذراء المجري الكوكبة العذراء[1] رمز الفهرس NGC 4179 (الفهرس العام الجديد)PGC 38950 (فهرس المجرات الرئيسية)2MASX J12125210+0117588 (Two Micron All-Sky Survey, Extended source catalogue)UGC 7214 (فهرس أوبسالا العام)MCG+00-31-038 (فهرس المجرات الموروفولوجي)EVCC 2034 (Extended Virgo Cluster Catalog)SDSS J121252.11+011758.8 (م...

History of Puerto Rico

Part of a series on theCulture of Puerto Rico Society Puerto Ricans Jíbaro History Immigration Languages Holidays Religion Topics Art Architecture Cinema Cuisine Dance Festivals Handicrafts Literature Media Cinema News media Newspapers Radio Television Miss Puerto Rico Monuments Music Painting Sports Instituto de Cultura Puertorriqueña Symbols Flag Coat of arms Anthem World Heritage Sites Puerto Rico portalvte History of Puerto Rico By year Spanish rule, 1493–1898 U.S. rule, 1898–p...

Times on base

Baseball statistic Max Carey was the first major-league player with nine times on base in a single game, in 1922. In baseball statistics, the term times on base (TOB), is the cumulative total number of times a batter has reached base as a result of a hit, base on balls, or hit by pitch. This statistic does not include times reaching base by way of an error, uncaught third strike, fielder's obstruction or a fielder's choice, making the statistic somewhat of a misnomer. Times on base leaders in...