{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "alexeyev-km-caspian-sea-monster",
 "name": "Alexeyev KM 'Caspian Sea Monster' ekranoplan (1966)",
 "kind": "modern",
 "category": "Ground-effect craft",
 "group": "Soviet and Russian ekranoplans (large)",
 "year": null,
 "question": "What are the dimensions of the Caspian Sea Monster (KM ekranoplan)?",
 "tags": [
  "ekranoplan",
  "wing in ground effect",
  "wig craft",
  "ground effect vehicle",
  "soviet and russian ekranoplans (large)"
 ],
 "aliases": [
  "caspian sea monster dimensions",
  "KM ekranoplan size",
  "caspian sea monster wingspan",
  "caspian sea monster length",
  "korabl maket specifications",
  "alexeyev km ekranoplan specs",
  "how big was the caspian sea monster",
  "caspian sea monster weight",
  "ekranoplan KM tamaño",
  "monstruo del mar caspio dimensiones",
  "Kaspisches Seemonster Abmessungen",
  "monstro do mar cáspio dimensões"
 ],
 "overall_mm": {
  "length": 92000,
  "width": 37600,
  "height": 21800
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/",
 "sheet_txt": "https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/sheet.txt",
 "sheet": {
  "basis": "Secondary source: Wikipedia, Old Machine Press, GlobalSecurity.org (copy of the maker's figures; the maker publishes none directly)",
  "overall_mm": {
   "length": 92000,
   "width": 37600,
   "height": 21800
  },
  "notes": [
   "The KM (korabl-maket) was Rostislav Alexeyev's 544-tonne test ekranoplan, flown on the Caspian Sea from 1966 until its loss in 1980.",
   "The file is a 92.00 × 37.60 × 21.80 m box using the Wikipedia figures (sourced to Komissarov, Russia's Ekranoplans); Old Machine Press gives 97.4 m length and 22.0 m height, so the length varies by source.",
   "Figures come from encyclopedic and magazine sources, not a design-bureau drawing, so the entry is marked secondary.",
   "True size, no printing tolerance added. Only published numbers are used; anything not published is said so.",
   "Secondary source: the numbers come from a retailer or magazine copy of the maker's specification."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "Length",
     "92.00 m (302 ft)"
    ],
    [
     "Wingspan",
     "37.60 m (123 ft)"
    ],
    [
     "Height",
     "21.80 m (71.5 ft)"
    ],
    [
     "Wing area",
     "662.50 m²"
    ],
    [
     "Tailplane span (GlobalSecurity)",
     "37.00 m"
    ],
    [
     "Empty weight",
     "240,000 kg"
    ],
    [
     "Maximum take-off weight",
     "544,000 kg"
    ],
    [
     "Powerplant",
     "10 × Dobrynin VD-7 turbojets (8 canard/nose-mounted boost, 2 on the fin), 127.53 kN each"
    ],
    [
     "Maximum speed",
     "500 km/h"
    ],
    [
     "Cruise speed",
     "430 km/h"
    ],
    [
     "Range",
     "1,500 km"
    ],
    [
     "Ground-effect flying height",
     "4–14 m"
    ],
    [
     "Max sea state",
     "1.2 m wave height"
    ],
    [
     "Alternative figures (Old Machine Press)",
     "Length 97.4 m (319 ft 7 in), height 22.0 m (72 ft 2 in), span 37.6 m; wing aspect ratio 2.0"
    ],
    [
     "First flight",
     "16 October 1966"
    ]
   ]
  }
 },
 "sheet_text": "Alexeyev KM 'Caspian Sea Monster' ekranoplan (1966) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/  (sheet CC BY 4.0)\nBasis: Secondary source: Wikipedia, Old Machine Press, GlobalSecurity.org (copy of the maker's figures; the maker publishes none directly)\nCatalog version: 2026-10-20\n\nOverall (mm): length 92000, width 37600, height 21800\n- The KM (korabl-maket) was Rostislav Alexeyev's 544-tonne test ekranoplan, flown on the Caspian Sea from 1966 until its loss in 1980.\n- The file is a 92.00 × 37.60 × 21.80 m box using the Wikipedia figures (sourced to Komissarov, Russia's Ekranoplans); Old Machine Press gives 97.4 m length and 22.0 m height, so the length varies by source.\n- Figures come from encyclopedic and magazine sources, not a design-bureau drawing, so the entry is marked secondary.\n- True size, no printing tolerance added. Only published numbers are used; anything not published is said so.\n- Secondary source: the numbers come from a retailer or magazine copy of the maker's specification.\n\ndimension  value\nLength  92.00 m (302 ft)\nWingspan  37.60 m (123 ft)\nHeight  21.80 m (71.5 ft)\nWing area  662.50 m²\nTailplane span (GlobalSecurity)  37.00 m\nEmpty weight  240,000 kg\nMaximum take-off weight  544,000 kg\nPowerplant  10 × Dobrynin VD-7 turbojets (8 canard/nose-mounted boost, 2 on the fin), 127.53 kN each\nMaximum speed  500 km/h\nCruise speed  430 km/h\nRange  1,500 km\nGround-effect flying height  4–14 m\nMax sea state  1.2 m wave height\nAlternative figures (Old Machine Press)  Length 97.4 m (319 ft 7 in), height 22.0 m (72 ft 2 in), span 37.6 m; wing aspect ratio 2.0\nFirst flight  16 October 1966\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Caspian Sea Monster (specifications, after Komissarov 2002) — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Caspian_Sea_Monster\n- Old Machine Press: Alexeyev KM Ekranoplan – Caspian Sea Monster — web — Publisher's page; dimensions are facts — https://oldmachinepress.com/2019/11/05/alexeyev-km-ekranoplan-caspian-sea-monster/\n- GlobalSecurity.org: Ekranoplan KM — web — Publisher's page; dimensions are facts — https://www.globalsecurity.org/military/world/russia/ekranoplan-km.htm\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/alexeyev-km-caspian-sea-monster/index.json\nAPI: https://xemstudio.com/api/geometry?object=alexeyev-km-caspian-sea-monster\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Caspian Sea Monster (specifications, after Komissarov 2002)",
   "url": "https://en.wikipedia.org/wiki/Caspian_Sea_Monster",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Old Machine Press",
   "title": "Alexeyev KM Ekranoplan – Caspian Sea Monster",
   "url": "https://oldmachinepress.com/2019/11/05/alexeyev-km-ekranoplan-caspian-sea-monster/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "GlobalSecurity.org",
   "title": "Ekranoplan KM",
   "url": "https://www.globalsecurity.org/military/world/russia/ekranoplan-km.htm",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "lun-class-ekranoplan-md-160",
  "a-90-orlyonok-ekranoplan"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "How long was the Caspian Sea Monster?",
   "a": "Wikipedia gives 92.00 m with a 37.60 m wingspan and 21.80 m height; Old Machine Press gives 97.4 m long."
  },
  {
   "q": "How heavy was the KM ekranoplan?",
   "a": "240,000 kg empty and 544,000 kg maximum take-off weight."
  },
  {
   "q": "How high did the KM fly?",
   "a": "In ground effect at 4–14 m above the surface."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "alexeyev-km-caspian-sea-monster-envelope",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/alexeyev-km-caspian-sea-monster/alexeyev-km-caspian-sea-monster-envelope.step",
   "stl": "https://xemstudio.com/files/hardware/alexeyev-km-caspian-sea-monster/alexeyev-km-caspian-sea-monster-envelope.stl",
   "note": "Envelope 92000 × 37600 × 21800 mm (Real craft: overall length × wingspan × overall height as published (Wikipedia/Komissarov figures); the box is a size envelope, not the hull shape)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/index.md"
}