{"product_id":"aichi-s1a-denko-night-fighter-technical-manuals-collection","title":"Aichi S1A Denkō — Night Fighter Technical Manuals Collection","description":"\u003cp\u003eThis Living Collection brings together primary-source technical documentation for the \u003cstrong\u003eAichi S1A Denkō (電光, \"Bolt of Light\")\u003c\/strong\u003e — factory designation \u003cstrong\u003eAM-25\u003c\/strong\u003e — the most massive fighter ever developed in Japan's naval history. Designed by Aichi Kokuki KK for the Imperial Japanese Navy (IJN) to counter B-29 Superfortress high-altitude raids, the Denkō was an experimental twin-engine night fighter of extraordinary ambition. Only two prototypes were constructed; both were destroyed by Allied bombing raids in 1945 before completion. The aircraft never flew.\u003c\/p\u003e\n\n\u003cp\u003eThis collection compiles data reconstructed from wartime design logs, the \u003cem\u003eDenkō Keikaku Setsumesho\u003c\/em\u003e (Denkō Project Explanation Manual), performance calculation sheets, and photographic records.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eCollection Contents — 2 Manuals\u003c\/h2\u003e\n\n\u003ch3\u003eS1A Aircraft Handbook (1 Manual)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS1A Experimental 18-Shi Night Fighter Denkō Project Manual\u003c\/strong\u003e — 試製電光（十八試丙戦）計画説明書 (Japanese Language)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eS1A Slides, Photos and Brochures (1 Manual)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS1A Photographic Collection\u003c\/strong\u003e (English Language)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eAircraft \u0026amp; Technical Overview\u003c\/h2\u003e\n\n\u003ch3\u003eAerodynamic Architecture\u003c\/h3\u003e\n\u003cp\u003eThe Denkō's airframe represented one of the most technically sophisticated Japanese naval fighter designs of the war:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWing Profile:\u003c\/strong\u003e Modelled after Heinkel He 100-style structural blueprints, featuring a specialised laminar-flow wing section to reduce high-altitude parasitic drag.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDihedral Configuration — Inner Wings:\u003c\/strong\u003e Shallow 2° 30' dihedral from fuselage to engine nacelles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDihedral Configuration — Outer Wings:\u003c\/strong\u003e Steep 6° dihedral from nacelles to clipped tips for maximum lateral stability during night interception.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuselage Architecture:\u003c\/strong\u003e Shared development cues with the Nakajima C6N1 Saiun. Exceptionally thick metal skin over minimal internal stringers — clean aerodynamic surface, reduced structural mass, shortened production time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirbrakes:\u003c\/strong\u003e Integrated trailing-edge mechanical airbrakes to prevent high-speed overshoots during close-in night bomber engagements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePowerplant — Nakajima NK9K-S Homare 22\u003c\/h3\u003e\n\u003cp\u003eTwin \u003cstrong\u003eNakajima NK9K-S Homare 22\u003c\/strong\u003e 18-cylinder air-cooled radial engines driving four-bladed constant-speed metal propellers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e 2,000 hp at takeoff — 1,885 hp at 1,750 m — 1,620 hp at 6,400 m.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Altitude Induction:\u003c\/strong\u003e Remote turbosuperchargers with auxiliary oxygen injection for performance above 8,000 m.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e Forced-cooling fans required inside tight-fitting cowlings due to chronic overheating discovered during static test runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngineering Shortcoming:\u003c\/strong\u003e Remote turbocharger layout caused severe exhaust pressure drops; Navy performance parameters were never fully met. Proposed post-prototype upgrade to Mitsubishi MK9A Ru or MK10A Ru engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHandling \u0026amp; Stability\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight Penalty:\u003c\/strong\u003e Avionics, radar gear, and heavy armour pushed combat weight beyond 10,000 kg, with projected heavy wing-loading characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Ergonomics:\u003c\/strong\u003e Highly forward-mounted teardrop canopy giving unobstructed view over wing leading edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRadar Operator Position:\u003c\/strong\u003e Seated separately at the wing trailing edge under a small observation dome, managing defensive systems independently.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentre of Gravity:\u003c\/strong\u003e Remote dorsal turret placement between crew positions required precise fuel tank balancing in the central fuselage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDefensive Tracking:\u003c\/strong\u003e Remotely controlled top turret eliminated aerodynamic buffeting and weight of a manned turret system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerformance Data\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWingspan\u003c\/td\u003e\n\u003ctd\u003e17.50 m (57 ft 5 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e15.10 m (49 ft 6.5 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.61 m (15 ft 1.5 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWing Area\u003c\/td\u003e\n\u003ctd\u003e47.00 m² (505.9 sq ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmpty Weight\u003c\/td\u003e\n\u003ctd\u003e7,320 kg (16,138 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Loaded Weight\u003c\/td\u003e\n\u003ctd\u003e10,180 kg (22,443 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Takeoff Weight\u003c\/td\u003e\n\u003ctd\u003e11,510 kg (25,375 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Speed\u003c\/td\u003e\n\u003ctd\u003e589 km\/h (366 mph) at 8,000 m (estimated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCruising Speed\u003c\/td\u003e\n\u003ctd\u003e444 km\/h (276 mph) at 4,000 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClimb Rate\u003c\/td\u003e\n\u003ctd\u003e14 min 45 sec to 9,000 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eService Ceiling\u003c\/td\u003e\n\u003ctd\u003e12,000 m (39,370 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operational Range\u003c\/td\u003e\n\u003ctd\u003e2,540 km (1,580 miles)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eAvionics \u0026amp; Engineering Bulletins\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-Intercept Radar:\u003c\/strong\u003e Gyoku-3 AI Radar with transmission antenna in a wooden nose radome and Yagi receiver array under the nose cone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAltimetry:\u003c\/strong\u003e Taki-11 radio altimeter with inverted 'T' dipoles under the wings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIFF:\u003c\/strong\u003e Taki-30 Identification Friend or Foe rod antenna on the rear spine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArmament — Standard Night Fighter:\u003c\/strong\u003e 2 × 30mm Type 5 cannons + 2 × 20mm Type 99 Model 2 cannons fixed forward in nose. 2 × 20mm Type 99 Model 2 in 30° Schräge Musik upward-firing layout. 2 × 20mm Type 99 Model 2 in remote dorsal turret.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e⚠️ Regulatory Notice: Under FAA 14 CFR § 43.13 and EASA Part-M, any mechanic performing maintenance on an active aircraft must use current, manufacturer-approved revision-controlled data. This archival document does not satisfy that requirement.\u003c\/p\u003e\n\n\u003cp\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\/p\u003e\n\u003cp\u003eLiving Collections with Free Lifetime Updates — Please review our Disclaimer and Export Notice before purchasing.\u003c\/p\u003e","brand":"Online Aviation Library","offers":[{"title":"Default Title","offer_id":53608407695707,"sku":"OAL-JP-AICHI-S1A","price":25.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/4788\/3867\/files\/aichi-s1a-denk-leaderboard-banner.png?v=1784217570","url":"https:\/\/onlineaviationlibrary.com\/products\/aichi-s1a-denko-night-fighter-technical-manuals-collection","provider":"Online Aviation Library","version":"1.0","type":"link"}