1. Core Advantages - Three Geometry Parameters That Define an Arm Tube
Outer diameter buys stiffness for free. For the same wall weight, a larger OD resists bending far better than a thick small tube. That's why long arms run 22–25 mm while light FPV builds stay under 16 mm.
Wall thickness balances weight and crash margin. 0.5 mm walls are light but brittle; 2–3 mm walls survive rough agricultural duty. We match the wall to your motor weight and crash expectation.
Layup direction sets the behavior. Roll-wrapped tubes mix 0° plies (axial stiffness, no droop) with ±45° plies (torsion and impact). Tell us what your arm needs more of - we set the ratio.
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2. Parameter Table (Typical Values, by OD Class)
| Tube class | OD | Wall | Typical use |
|---|---|---|---|
| Light FPV | 10 – 14 mm | 0.8 – 1.5 mm | 3–5" racers, small builds |
| Mid-size | 16 – 20 mm | 1.0 – 2.0 mm | Cinematic, long-range |
| Agricultural / heavy | 22 – 25 mm | 1.5 – 3.0 mm | Spraying, payload 5–25 kg |
| Long boom | 30 mm+ | 2.0 – 3.0 mm | Long fixed-wing / heavy platforms |
| Build parameter | Typical value |
|---|---|
| Material | T300 / T700 / T800 prepreg |
| Process | Roll-wrapped (mandrel) |
| Layup angles | 0° / ±45° / 90°, tuned |
| OD tolerance | ±0.15 mm raw; ±0.1 mm polished |
| Standard length | Cut to your size |
| Surface | Glossy or matte 3K |
| MOQ | Stock sizes from small qty |
Typical industry values; OD, wall and length locked from your design.
3. Customization - Tube to Your Drawing
OD, wall, length - cut to your arm length, deburred ends.
End processing - clamp slots, flare, or plain ends for your connector plate.
Color / finish - glossy, matte, or colored gel on request.
Stock sizes ready - common diameters ship fast; custom layup after sample.
4. Company Advantages - Export Factory, Stock Ready
Stock sizes in hand. Common OD classes ready to cut - no mold lead time for standard tubes.
Cut-to-length fast. Order your length; deburred ends ready for assembly.
Batch traceability. Material lot and layup documented; reorders match.
Flexible shipping. Express for samples, sea freight for bulk.
5. FAQ
Q: Which OD and wall does my build need? By motor weight and arm length: light builds 10–14 mm / 1 mm; agricultural 22–25 mm / 1.5–2.5 mm. Tell us your specs.
Q: What OD tolerance should I design the clamp for? Design to the tube's actual OD - raw ~±0.15 mm, polished tighter. We'll confirm before you cut the connector.
Q: Will it survive a crash? Roll-wrapped ±45° layup absorbs better than all-0° tubes; thin walls still snap on hard impact. Match the wall to your crash rate.
Q: Can you match my existing clamp? Send the tube or measured OD; we machine to fit.
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