# H frame

> What is an H quad 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/h-frame/ · JSON: https://xemstudio.com/api/geometry?object=h-frame · Plain text: https://xemstudio.com/objects/h-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

- An H frame has parallel arms on a central pod; pilots find it the most rigid layout (IntoFPV), and it can keep props out of view with the camera forward (Oscar Liang).
- UAVModel lists it for racing and low profile, but heavier and less agile.
- 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 |
|---|---|---|
| Layout | arms parallel, centre pod | UAVModel |
| 5 in prop frame size | 210-250 mm diagonal (motor to motor) | Grepow |

## Where the files are

- IntoFPV forum: [Frame layouts, configurations and their characteristics](https://intofpv.com/printthread.php?tid=15838) — web — Publisher's page; dimensions are facts
- UAVModel blog: [FPV Drone Frame Selection Guide: Geometry, Materials, and Arm Design](https://blog.uavmodel.com/fpv-drone-frame-selection-guide/) — 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

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

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

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

## Questions

**H or X?**

Oscar Liang notes ongoing debate; IntoFPV pilots rate H most rigid.

## Fits with

- [True X quad frame](https://xemstudio.com/objects/true-x-frame/)
- [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/)
- [Plus (+) quad configuration](https://xemstudio.com/objects/plus-frame/)