Alexeyev SM-8 ekranoplan (second 1/4-scale KM test craft) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/alexeyev-sm-8-ekranoplan/  (sheet CC BY 4.0)
Basis: Secondary source: Old Machine Press (copy of the maker's figures; the maker publishes none directly)
Catalog version: 2026-10-20

Overall (mm): length 18500, width 9500, height 5500
- The SM-8 replaced the SM-5 as the quarter-scale KM trainer and test craft.
- The file is an 18.5 × 9.5 × 5.5 m box. The source's weight figures conflict (16,094 lb is about 7,300 kg, not 8,100 kg), so weight is not used.
- 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  18.5 m (60 ft 8 in)
Wingspan  9.5 m (31 ft 2 in)
Height  5.5 m (18 ft 1 in)
Maximum weight  published as 16,094 lb / 8,100 kg (the two figures do not agree)
Engines  2 × Mikulin KR7-300 jet engines
Ground-effect flying height  1–3 m (3–10 ft)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Old Machine Press: Alexeyev KM Ekranoplan – Caspian Sea Monster (SM-8 section) — web — Publisher's page; dimensions are facts — https://oldmachinepress.com/2019/11/05/alexeyev-km-ekranoplan-caspian-sea-monster/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/alexeyev-sm-8-ekranoplan/index.json
API: https://xemstudio.com/api/geometry?object=alexeyev-sm-8-ekranoplan