{"product_id":"lycoming-r-680-aircraft-engine-manuals-collection-download","title":"Lycoming R-680 Aircraft Engine Manuals Collection - Download","description":"\u003ch3\u003eLycoming R-680 Aircraft Engine Manuals Collection\u003c\/h3\u003e\n\u003cp\u003eThis collection brings together \u003cstrong\u003e16 historical technical publications\u003c\/strong\u003e covering the Lycoming R-680 series of air-cooled radial aircraft engines, spanning from \u003cstrong\u003e1934 to 1948\u003c\/strong\u003e. The R-680 was Lycoming's first aircraft engine — a 9-cylinder, single-row radial that quickly earned a reputation for exceptional reliability and became the \u003cstrong\u003eprimary powerplant for American military training aircraft\u003c\/strong\u003e throughout the 1930s and into World War II. Over 26,000 units were produced between 1930 and 1945, logging millions of flight hours training the pilots who would win the war.\u003c\/p\u003e\n\u003ch3\u003eHistorical Background\u003c\/h3\u003e\n\u003cp\u003eFirst run in \u003cstrong\u003e1929\u003c\/strong\u003e and type certificated on \u003cstrong\u003e4 February 1930\u003c\/strong\u003e (Type Certificate No. 42), the R-680 was developed by the \u003cstrong\u003eLycoming Foundry and Machine Company\u003c\/strong\u003e (later Avco Lycoming), a subsidiary of the Auburn Auto Company. It evolved from the earlier, less successful Lycoming R-645 and was designed to replace the Curtiss OX-5 as the standard American trainer engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMilitary applications\u003c\/strong\u003e included the Boeing\/Stearman PT-13 Kaydet, Beech AT-10 Wichita, Cessna AT-8\/AT-17 Bobcat, Curtiss-Wright AT-9 Jeep, and Stinson L-1 Vigilant. \u003cstrong\u003eCivilian applications\u003c\/strong\u003e included the Stinson Reliant, Stinson Airliner, and various Waco S Series aircraft. Post-war, the engine remained popular in surplus trainers and utility aircraft well into the 1950s.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e 9-cylinder, single-row, air-cooled piston radial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 680 cu in (11.14 litres)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 200–300 hp (some models to 320 hp supercharged)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore × Stroke:\u003c\/strong\u003e 4.625 in × 4.5 in (117 mm × 114 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression ratio:\u003c\/strong\u003e 5.3:1 (early) to 7:1 (later models)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry weight:\u003c\/strong\u003e ~505–515 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel:\u003c\/strong\u003e 73–87 octane\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetion:\u003c\/strong\u003e Stromberg carburettors; Scintilla magnetos\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Aluminium alloy heads shrunk onto steel barrels with integrated cooling fins\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Variants\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eB Series\u003c\/strong\u003e (e.g., B4E — 225 hp): Early trainer models with front exhaust collectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eE Series\u003c\/strong\u003e (e.g., E3A — 285 hp): Improved output variants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-680-9\u003c\/strong\u003e (295 hp) \/ \u003cstrong\u003eR-680-13\u003c\/strong\u003e (280 hp): Common high-output military variants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-680-10\u003c\/strong\u003e: Supercharged variant producing 320 hp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-680-17\u003c\/strong\u003e: Late-war production variant (1944)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCurrent Status\u003c\/h3\u003e\n\u003cp\u003eThe R-680 is \u003cstrong\u003estill flying today\u003c\/strong\u003e, primarily in restored Stearman PT-13 trainers and Stinson Reliants on the vintage and warbird circuit. The current Type Certificate is held by \u003cstrong\u003eLycoming Engines (Textron)\u003c\/strong\u003e. Active FAA Airworthiness Directives and legacy Service Bulletins apply — operators must track these carefully.\u003c\/p\u003e\n\u003ch3\u003eList of Manuals Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eManual — Lycoming R-680 Series Aviation Engine — Third Edition — Lycoming Manufacturing Company, Williamsport, Pennsylvania — April 15, 1934\u003c\/li\u003e\n\u003cli\u003eHandbook of Operation and Flight Instructions — Model R-680-7 Engine and Associated Models (R-680-3, -5, -7 and -11) — T.O. No. 02-15AA-1 — The Aviation Corporation (Lycoming Division) — May 25, 1940 (Revised 5-1-42)\u003c\/li\u003e\n\u003cli\u003eHandbook of Service Instructions — Model R-680-3 Engine and Associated Models (R-680-3, -5 and -7) — T.O. No. 02-15A-2 — Aviation Manufacturing Corp. (Lycoming Division) — September 20, 1937 (Revised Nov. 10, 1939)\u003c\/li\u003e\n\u003cli\u003eOverhaul Instructions — R-680-3, -5, -7 and -11 Aircraft Engines — T.O. No. 02-15AA-3 — 20 May 1941 (Revised 15 September 1944)\u003c\/li\u003e\n\u003cli\u003eService Instructions — R-680-3, -5, -7 and -11 Aircraft Engines — T.O. No. 02-15AA-2 — 15 January 1941 (Revised 15 September 1944)\u003c\/li\u003e\n\u003cli\u003eHandbook of Overhaul Instructions — R-680-9 and -13 Aircraft Engines — T.O. No. 02-15AB-3 — April 15, 1941 (Revised 12-20-42)\u003c\/li\u003e\n\u003cli\u003eParts Catalog — R-680-9 and -13 Aircraft Engines — T.O. No. 02-15AB-4 — April 25, 1942 (Revised April 5, 1943)\u003c\/li\u003e\n\u003cli\u003eService Instructions — R-680-9, -13 Aircraft Engines — T.O. No. 02-15AB-2 — 1 July 1942 (Revised 15 September 1944)\u003c\/li\u003e\n\u003cli\u003eOperating Instructions — R-680-9 and -13 Aircraft Engines — April 25, 1943 (Revised June 25, 1943)\u003c\/li\u003e\n\u003cli\u003eInterchangeable Parts List — R-680 Lycoming Aircraft Engines — Class O2-E — T.O. No. 02-15-4 — August 15, 1942 (Revised 1-5-43)\u003c\/li\u003e\n\u003cli\u003eTable of Limits — Lycoming Aircraft Engines — AN 02-15-1 \/ A.P. No. 2377A — December 5, 1943\u003c\/li\u003e\n\u003cli\u003eOperators Manual — Lycoming Type R-680 and R-530 Aviation Engines — Second Edition, Revised June 1939 — Lycoming Division, The Aviation Corporation — Reprinted January 1947\u003c\/li\u003e\n\u003cli\u003eOverhaul Instructions — R-680-17 Aircraft Engines — AN 02-15AC-3 — 15 August 1944 (Revised 20 June 1945)\u003c\/li\u003e\n\u003cli\u003eParts Catalog — R-680-17 Aircraft Engines — AN 02-15AC-4 — February 15, 1944\u003c\/li\u003e\n\u003cli\u003eService Instructions — R-680-17 Aircraft Engines — AN 02-15AC-2 — 1 July 1944 (Revised 20 September 1944)\u003c\/li\u003e\n\u003cli\u003eOverhaul Manual — Lycoming R-680 Aviation Engines — Fifth Edition — Lycoming Division, The Aviation Corporation — 1946 (Reprinted 1948)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFormat \u0026amp; Delivery\u003c\/h3\u003e\n\u003cp\u003eAll documents are provided as \u003cstrong\u003ehigh-resolution PDF files\u003c\/strong\u003e, delivered as a compressed archive (RAR\/ZIP). To open your download, you will need a free extraction tool such as \u003cstrong\u003eWinRAR\u003c\/strong\u003e or \u003cstrong\u003e7-Zip\u003c\/strong\u003e (Windows) or \u003cstrong\u003eThe Unarchiver\u003c\/strong\u003e (Mac). Once extracted, all files open as standard PDFs on any device.\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003ch4\u003eExport \u0026amp; Compliance Notice\u003c\/h4\u003e\n\u003cp\u003eThese materials consist of historical U.S. military technical publications spanning 1934 to 1948 (Lycoming series), provided for educational, research, and reference purposes only.\u003c\/p\u003e\n\u003cp\u003eEach document has been reviewed for obvious restrictions and does not display classification markings, export control notices, or distribution limitations on the cover or within the document body.\u003c\/p\u003e\n\u003cp\u003eThe publications are sourced from publicly available repositories, including the Defense Technical Information Center (DTIC) and Internet Archive, and are offered in consolidated form for the convenience of researchers, historians, restorers, and aviation enthusiasts.\u003c\/p\u003e\n\u003cp\u003eThese materials are not intended for current operational, certification, or repair use, nor for the manufacture or modification of any aircraft or systems.\u003c\/p\u003e\n\u003cp\u003eNo ITAR-controlled or EAR-restricted material is knowingly included.\u003c\/p\u003e\n\u003cp\u003eTo the best of our knowledge, the materials do not contain currently classified information or content subject to active export restrictions. However, no representation or warranty is made regarding export classification status.\u003c\/p\u003e\n\u003cp\u003eBy completing this purchase, you agree to comply with all applicable laws and regulations, including any export or import requirements in your country.\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"Online Aviation Library","offers":[{"title":"Default Title","offer_id":52917093761371,"sku":null,"price":39.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/4788\/3867\/files\/promotional-banner_4c5d52d1-1e5b-4a8c-afc3-c7864b5f564a.png?v=1777957960","url":"https:\/\/onlineaviationlibrary.com\/products\/lycoming-r-680-aircraft-engine-manuals-collection-download","provider":"Online Aviation Library","version":"1.0","type":"link"}