{"product_id":"hirth-hm-508-engine-manuals-collection","title":"Hirth HM 508 — Engine Manuals Collection","description":"\u003ch2\u003eHirth HM 508 — Engine Manuals Collection\u003c\/h2\u003e\u003cp\u003eA curated archival collection of primary-source technical documents covering the \u003cstrong\u003eHirth HM 508\u003c\/strong\u003e — the powerful 8-cylinder inverted-V inline engine that powered the long-range \u003cstrong\u003eHeinkel He 116\u003c\/strong\u003e and the elegant \u003cstrong\u003eMesserschmitt Bf 108C\u003c\/strong\u003e, representing the pinnacle of Hirth’s pre-war engineering ambition.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eCollection Overview\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eTotal Unique Manuals: 3\u003c\/strong\u003e\u003cbr\u003eVariants covered: \u003cstrong\u003eC\/D, H\/J\u003c\/strong\u003e\u003c\/p\u003e\u003cblockquote\u003e\n\u003cstrong\u003eNote on Multi-Variant Manuals:\u003c\/strong\u003e Some manuals apply to multiple variants. To ensure easier access and better usability, files are included in each relevant variant folder. The total number of manuals refers to unique files and does not include repeated copies across folders.\u003c\/blockquote\u003e\u003chr\u003e\u003ch3\u003eVariant C\/D — 2 Manuals\u003c\/h3\u003e\u003ch4\u003eHM 508 C\/D Operating and Maintenance\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 508 H, J and D Aircraft Engine Description and Operating Instructions, \u003cem\u003eBeschreibung und Betriebsanweisung\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eHM 508 C\/D Repair Instructions\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 508 C, D Aircraft Engine Partial Overhaul Instructions, \u003cem\u003eBeschreibung und Teilüberholungsanleitung\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eVariant H\/J — 2 Manuals\u003c\/h3\u003e\u003ch4\u003eHM 508 H\/J Operating and Maintenance\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 508 H, J and D Aircraft Engine Description and Operating Instructions, \u003cem\u003eBeschreibung und Betriebsanweisung\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eHM 508 H\/J Brochures \u0026amp; Training\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 508 H Aircraft Engine Technical Brochure, \u003cem\u003eProspekt\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eAbout the Hirth HM 508\u003c\/h3\u003e\u003ch4\u003eHistorical Background\u003c\/h4\u003e\u003cp\u003eFirst introduced in \u003cstrong\u003e1936\u003c\/strong\u003e and produced through 1940, the HM 508 was developed by \u003cstrong\u003eHirth Motoren GmbH\u003c\/strong\u003e (later Heinkel-Hirth) as an expansion of the proven HM 504 and HM 506 inverted inline series, sharing identical cylinder dimensions scaled to 8 cylinders in a 60-degree inverted-V configuration. It powered the \u003cstrong\u003eHeinkel He 116\u003c\/strong\u003e long-range mailplane and reconnaissance aircraft and the \u003cstrong\u003eMesserschmitt Bf 108C\u003c\/strong\u003e touring aircraft. Though a technically accomplished engine, it was largely passed over in favour of the competing Argus As 10, resulting in a limited production run. Wartime use included specialized long-range reconnaissance and map-making He 116 variants operated by the Luftwaffe early in World War II.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Inverted-V inline, air-cooled piston engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 8-cylinder, 60-degree inverted V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 7.97 L (486.1 cu in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore × Stroke:\u003c\/strong\u003e 105 mm × 115 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Output:\u003c\/strong\u003e 240–280 hp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 6.2:1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 208 kg (458.6 lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel:\u003c\/strong\u003e 87 octane aviation gasoline (B4 standard)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eEngineering Distinction\u003c\/h4\u003e\u003cp\u003eThe HM 508 features a single-stage centrifugal supercharger, the patented \u003cstrong\u003eHirth built-up multi-piece crankshaft\u003c\/strong\u003e with precision interlocking radial couplings, and complete roller-bearing construction throughout for high-RPM efficiency. The HM 508D variant added a 0.666:1 reduction gear, developing 280 hp.\u003c\/p\u003e\u003ch4\u003eCurrent Status\u003c\/h4\u003e\u003cp\u003eThe HM 508 is \u003cstrong\u003eno longer in active airworthiness service\u003c\/strong\u003e. No active Type Certificate holder exists; the original certificate was held under the Reichsluftfahrtministerium\/LBA and is now legally obsolete. No active Service Bulletins or Airworthiness Directives apply. Surviving examples are static displays in specialized aviation exhibits including the Polish Aviation Museum.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cem\u003eThis is an archival, static-copy edition fixed at its original publication date. Intended for historical reference, flight simulation, museum restoration, and educational use only. Not approved for active airworthiness maintenance under FAA 14 CFR § 43.13, EASA Part-M, or equivalent international regulations. Operators of active aircraft must use current, revision-controlled publications from the Type Certificate holder or an authorized distributor.\u003c\/em\u003e\u003cbr\u003e\u003cstrong\u003eLiving Collections with Free Lifetime Updates — Please review our Disclaimer and Export Notice before purchasing.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Online Aviation Library","offers":[{"title":"Default Title","offer_id":53443898474843,"sku":null,"price":30.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/4788\/3867\/files\/hirth-hm-508-promotional-banner.png?v=1782402128","url":"https:\/\/onlineaviationlibrary.com\/products\/hirth-hm-508-engine-manuals-collection","provider":"Online Aviation Library","version":"1.0","type":"link"}