{"product_id":"hirth-hm-506-engine-manuals-collection","title":"Hirth HM 506 — Engine Manuals Collection","description":"\u003ch2\u003eHirth HM 506 — Engine Manuals Collection\u003c\/h2\u003e\u003cp\u003eA curated archival collection of primary-source technical documents covering the \u003cstrong\u003eHirth HM 506\u003c\/strong\u003e — the rare and elegant 6-cylinder inverted inline engine developed as the aerobatic heart of the \u003cstrong\u003eBücker Bü 133 Jungmeister\u003c\/strong\u003e, one of the most celebrated advanced trainer and aerobatic aircraft of the interwar era.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eCollection Overview\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eTotal Unique Manuals: 4\u003c\/strong\u003e\u003cbr\u003eVariants covered: \u003cstrong\u003eA\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eVariant A — 4 Manuals\u003c\/h3\u003e\u003ch4\u003eHM 506 A Operating and Maintenance\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 506 A Aircraft Engine Operating and Maintenance Instructions Manual, \u003cem\u003eBetriebsanweisung und Wartungsvorschrift\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eHM 506 A Illustrated Parts Catalog\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 506 A Aircraft Engine — Illustrated Parts Catalog Manual 1938, \u003cem\u003eErsatzteilliste\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eHM 506 A Technical Publications\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 506 A Aircraft Engine Technical Data Sheet from Heinkel Company Publication, \u003cem\u003eHeinkel-Werkzeitung\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eHM 506 A Brochures \u0026amp; Training\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eHM 506 A Aircraft Engine Technical Brochure, \u003cem\u003eProspekt\u003c\/em\u003e (German Language)\u003c\/li\u003e\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eAbout the Hirth HM 506\u003c\/h3\u003e\u003ch4\u003eHistorical Background\u003c\/h4\u003e\u003cp\u003eFirst introduced in \u003cstrong\u003e1934\u003c\/strong\u003e by \u003cstrong\u003eHirth Motoren GmbH\u003c\/strong\u003e (Stuttgart\/Benningen, Germany), the HM 506 evolved directly from the proven 4-cylinder HM 504 as part of a standardized modular engine family sharing identical cylinder dimensions. Fewer than \u003cstrong\u003e100 units\u003c\/strong\u003e were produced, making surviving documentation exceptionally rare. It powered early advanced Luftwaffe training and aerobatic prototypes including the \u003cstrong\u003eBücker Bü 133A\/B Jungmeister\u003c\/strong\u003e, though its military role was largely eclipsed by radial alternatives during full production. Post-war use was highly limited, with most surviving units preserved in private vintage collections or museums.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Inverted inline, air-cooled piston engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 6-cylinder inline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 5.98 L (364.7 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 130–160 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 149 kg (328 lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel:\u003c\/strong\u003e 72–80 octane aviation gasoline\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eEngineering Distinction\u003c\/h4\u003e\u003cp\u003eThe HM 506 features a cast magnesium alloy (\u003cem\u003eElektron\u003c\/em\u003e) crankcase for exceptional weight reduction, standard dual-spark ignition, and the signature \u003cstrong\u003eHirth built-up multi-piece crankshaft\u003c\/strong\u003e with ultra-high-precision interlocking radial couplings and full roller-bearing construction for low rotational friction and outstanding reliability.\u003c\/p\u003e\u003ch4\u003eCurrent Status\u003c\/h4\u003e\u003cp\u003eExtremely rare in airworthy condition. Isolated restored examples operate under special experimental, vintage, or classic airworthiness regulations aboard surviving \u003cstrong\u003eBücker Bü 133 Jungmeister\u003c\/strong\u003e airframes. No active Type Certificate holder exists; no active Service Bulletins or Airworthiness Directives apply. The vast majority of surviving units are static museum pieces.\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":53443978920283,"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-506-promotional-banner.png?v=1782403844","url":"https:\/\/onlineaviationlibrary.com\/products\/hirth-hm-506-engine-manuals-collection","provider":"Online Aviation Library","version":"1.0","type":"link"}