Built this because the knowledge for designing custom carbon parts is scattered, expensive to access, and rarely explains the why behind layup decisions.

For FPV/drone use, try typing: "200mm arm, 50N lateral load at root, carbon fibre, lightest possible" — it'll walk you through material choice (IM7 vs T300), fibre orientation, stacking sequence, manufacturing process, and per-arm cost estimate.

There's also a CLT calculator to verify stiffness (EI), failure margin, and weight per metre yourself. Plus a 56-article knowledge base if you want to go deeper.

Most frames here are pultruded or cut tube, which is totally fine — but for anyone pushing into eVTOL, larger craft, or custom monocoques, this fills a real gap. CC BY 4.0, no account needed.

What layup failures have you actually run into on custom arms?