# Alexeyev KM 'Caspian Sea Monster' ekranoplan (1966)

> What are the dimensions of the Caspian Sea Monster (KM ekranoplan)?

- Category: Ground-effect craft › Soviet and Russian ekranoplans (large)
- Kind: Modern device
- Basis: Secondary source: Wikipedia, Old Machine Press, GlobalSecurity.org (copy of the maker's figures; the maker publishes none directly)
- Page: https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/ · JSON: https://xemstudio.com/api/geometry?object=alexeyev-km-caspian-sea-monster · Plain text: https://xemstudio.com/objects/alexeyev-km-caspian-sea-monster/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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## Overall (mm)

| length | width | height |
|---|---|---|
| 92000 | 37600 | 21800 |

**Exact dimensions.** True size, with no printing tolerance added.

## 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.

## Sizes

| 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 |

## Where the files are

- Wikipedia: [Caspian Sea Monster (specifications, after Komissarov 2002)](https://en.wikipedia.org/wiki/Caspian_Sea_Monster) — web — Publisher's page; dimensions are facts
- Old Machine Press: [Alexeyev KM Ekranoplan – Caspian Sea Monster](https://oldmachinepress.com/2019/11/05/alexeyev-km-ekranoplan-caspian-sea-monster/) — web — Publisher's page; dimensions are facts
- GlobalSecurity.org: [Ekranoplan KM](https://www.globalsecurity.org/military/world/russia/ekranoplan-km.htm) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/alexeyev-km-caspian-sea-monster/index.json

- alexeyev-km-caspian-sea-monster-envelope: [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) — 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)

## Questions

**How long was the Caspian Sea Monster?**

Wikipedia gives 92.00 m with a 37.60 m wingspan and 21.80 m height; Old Machine Press gives 97.4 m long.

**How heavy was the KM ekranoplan?**

240,000 kg empty and 544,000 kg maximum take-off weight.

**How high did the KM fly?**

In ground effect at 4–14 m above the surface.

## Fits with

- [Lun-class ekranoplan MD-160 (Project 903)](https://xemstudio.com/objects/lun-class-ekranoplan-md-160/)
- [A-90 Orlyonok ekranoplan (Project 904)](https://xemstudio.com/objects/a-90-orlyonok-ekranoplan/)