# True X quad frame

> What is a true X quadcopter frame?

- Category: Drone design › Drone frame layouts
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/true-x-frame/ · JSON: https://xemstudio.com/api/geometry?object=true-x-frame · Plain text: https://xemstudio.com/objects/true-x-frame/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

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

## Notes

- A true X puts four motors on equal arms 90 deg apart, in a square (UAVModel). Roll and pitch behave the same, so tuning is simplest, and one filter notch covers all arms.
- It has the best yaw response, but the two front props show in the camera's upper corners (UAVModel; IntoFPV).
- The file is a reference example built by Xem Studio from the numbers above (Reference 5-inch build: 220 mm diagonal within Grepow's 210-250 mm class for 5 in props.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

## Sizes

| parameter | value or range | source |
|---|---|---|
| Arm spacing | 90 deg | UAVModel; Oscar Liang |
| 5 in prop frame size | 210-250 mm diagonal (motor to motor) | Grepow |
| 5 in arm thickness | 5 mm standard; resonance ~180-220 Hz | UAVModel |

## Where the files are

- UAVModel blog: [FPV Frame Geometry: Deadcat vs True X vs Squashed X (2026 guide)](https://blog.uavmodel.com/fpv-frame-geometry-deadcat-vs-true-x-vs-squashed-x-prop-view-resonance-and-flight-feel-2026-guide/) — web — Publisher's page; dimensions are facts
- IntoFPV forum: [Frame layouts, configurations and their characteristics](https://intofpv.com/printthread.php?tid=15838) — web — Publisher's page; dimensions are facts
- Oscar Liang: [Types of multicopter](https://oscarliang.com/types-of-multicopter) — web — Publisher's page; dimensions are facts
- Grepow: [What size FPV drone should I get?](https://grepow.com/blog/what-size-fpv-drone-should-i-get.html) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/true-x-frame/index.json · license: https://xemstudio.com/files/hardware/true-x-frame/LICENSE.md

- true-x-frame-layout: [STEP](https://xemstudio.com/files/hardware/true-x-frame/true-x-frame-layout.step) · [STL](https://xemstudio.com/files/hardware/true-x-frame/true-x-frame-layout.stl) — true x frame layout: 220 mm motor-to-motor diagonal, 5 in props (discs show the swept area; arms and plate illustrative)

## Questions

**Why choose true X?**

Symmetric handling and the cleanest tune (UAVModel).

## Fits with

- [Stretched X frame](https://xemstudio.com/objects/stretched-x-frame/)
- [Squashed (wide) X frame](https://xemstudio.com/objects/squashed-x-frame/)
- [Hybrid X frame](https://xemstudio.com/objects/hybrid-x-frame/)
- [Deadcat frame](https://xemstudio.com/objects/deadcat-frame/)
- [H frame](https://xemstudio.com/objects/h-frame/)
- [Plus (+) quad configuration](https://xemstudio.com/objects/plus-frame/)