Alexeyev KM 'Caspian Sea Monster' ekranoplan (1966) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/  (sheet CC BY 4.0)
Basis: Secondary source: Wikipedia, Old Machine Press, GlobalSecurity.org (copy of the maker's figures; the maker publishes none directly)
Catalog version: 2026-10-20

Overall (mm): length 92000, width 37600, height 21800
- 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.

dimension  value
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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Caspian Sea Monster (specifications, after Komissarov 2002) — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Caspian_Sea_Monster
- 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/
- GlobalSecurity.org: Ekranoplan KM — web — Publisher's page; dimensions are facts — https://www.globalsecurity.org/military/world/russia/ekranoplan-km.htm

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/alexeyev-km-caspian-sea-monster/index.json
API: https://xemstudio.com/api/geometry?object=alexeyev-km-caspian-sea-monster