True X quad frame — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/true-x-frame/ (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 - 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. 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 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/ - IntoFPV forum: Frame layouts, configurations and their characteristics — web — Publisher's page; dimensions are facts — https://intofpv.com/printthread.php?tid=15838 - Oscar Liang: Types of multicopter — web — Publisher's page; dimensions are facts — https://oscarliang.com/types-of-multicopter - Grepow: What size FPV drone should I get? — web — Publisher's page; dimensions are facts — https://grepow.com/blog/what-size-fpv-drone-should-i-get.html Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/true-x-frame/index.json API: https://xemstudio.com/api/geometry?object=true-x-frame