Frame arm thickness — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/arm-thickness/  (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
- Thicker arms resist crashes and push resonance higher but add weight (UAVModel).
- 5 mm is standard for 5 in freestyle; 6 mm adds 15-20 g and moves resonance to 240-280 Hz. Arms narrower than 12 mm at the motor can flex into a 40-60 Hz wobble (UAVModel).
- 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.

parameter  value or range  source
4 mm  3 in / ultralight 5 in  UAVModel
5 mm  5 in freestyle/racing; ~180-220 Hz  UAVModel
6 mm  +15-20 g; ~240-280 Hz  UAVModel
8 mm  7 in long range  UAVModel
Arm width at motor, 5 in  13-14 mm  UAVModel

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- UAVModel blog: FPV Frame Geometry: Deadcat vs True X vs Squashed X (2026 guide) — web — Publisher's page; dimensions are facts — https://blog.uavmodel.com/fpv-frame-geometry-deadcat-vs-true-x-vs-squashed-x-prop-view-resonance-and-flight-feel-2026-guide/
- UAVModel blog: FPV Drone Frame Selection Guide: Geometry, Materials, and Arm Design — web — Publisher's page; dimensions are facts — https://blog.uavmodel.com/fpv-drone-frame-selection-guide/

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