X8 coaxial quad — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/x8-coaxial/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- X8 puts a coaxial pair on each arm of an X: more lift and redundancy in a compact, foldable footprint, at a coaxial efficiency penalty of ~10-20% (Oscar Liang).
- The file is a reference example built by Xem Studio from the numbers above (Illustrative; true X with coaxial pairs.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

parameter  value or range  source
Coaxial efficiency loss  ~10-20%  Oscar Liang

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Oscar Liang: Types of multicopter — web — Publisher's page; dimensions are facts — https://oscarliang.com/types-of-multicopter
- r/multicopter wiki (mirror): Anatomy of a Multicopter — web — Publisher's page; dimensions are facts — https://r.datuan.dev/r/multicopter/wiki/anatomy
- ArduPilot: Archived: Advanced MultiCopter Design — web — Publisher's page; dimensions are facts — https://ardupilot.org/copter/docs/advanced-multicopter-design.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/x8-coaxial/index.json
API: https://xemstudio.com/api/geometry?object=x8-coaxial