1. Performance Requirements for Drone Frame Materials
Drones, especially industrial-grade multi-rotor drones and VTOL (vertical takeoff and landing) fixed-wing drones, place extremely demanding requirements on airframe materials. Unlike consumer-grade aerial photography drones, the design philosophy of industrial drones is: maximize payload within the limited Maximum Takeoff Weight (MTOW) constraint. This means the specific strength (strength-to-weight ratio) and specific stiffness (stiffness-to-weight ratio) of the frame material are the core selection criteria.
1.1 Comparison of Mainstream Drone Frame Materials
| Material | Density (g/cm³) | Tensile Strength (MPa) | Specific Strength | CF Plate Advantage |
|---|---|---|---|---|
| Aluminum Alloy 6061-T6 | 2.7 | 310 | 115 | — |
| Titanium Alloy TC4 | 4.5 | 950 | 211 | — |
| Ordinary GFRP | 2.0 | 350 | 175 | — |
| Carbon Fiber (CFRP) | 1.5~1.7 | 500~2000 | 294~1200 | Significantly Leading |
The data shows that the specific strength of carbon fiber composite is 2.6 to 10 times that of aluminum alloy and 1.7 to 7 times that of GFRP, giving it an overwhelming advantage in the lightweighting race. For example, a multi-rotor drone with a 1.2m wheelbase using carbon fiber arms can reduce weight by approximately 35% compared to aluminum alloy, directly adding approximately 500g of usable payload.
2. Material Properties and Classification of Carbon Fiber Plates
2.1 Manufacturing Processes for Carbon Fiber Plates
Carbon fiber plates are composed of carbon fiber tows and an epoxy resin matrix, with three main manufacturing processes:
- Prepreg Hot Press Molding: Carbon fiber prepreg layers are laid up and cured under heat and pressure with controllable fiber orientation and optimal performance, making it the first choice for industrial drone primary structural components
- Carbon Fiber Fabric Lamination: Multiple layers of carbon fiber fabric stacked and pressed, moderate cost, suitable for large-scale production
- Carbon Fiber + Nomex Honeycomb Sandwich: Upper and lower carbon fiber face sheets with honeycomb core, lightweight + high stiffness combination, commonly used for arms and main structures of large drones
2.2 Key Performance Indicators of Carbon Fiber Plates
| Indicator | Meaning | Impact on Drone Performance |
|---|---|---|
| Layup Direction | 0°/45°/90° layup angle design | Determines anisotropic strength distribution of the structure |
| Thickness | 0.5mm~10mm available | Affects balance between structural stiffness and weight |
| Areal Density | 200g/m² ~ 600g/m² | Directly related to total aircraft weight |
| Interlaminar Shear Strength (ILSS) | ≥25MPa (premium grade) | Indicates interlaminar bonding reliability |
| Coefficient of Thermal Expansion (CTE) | Near zero (~0) | Excellent dimensional stability under temperature variation |
| Carbon Fiber Tow Specification | 1K/3K/6K/12K | 1K is finest; 3K offers the best cost-to-performance ratio |
2.3 Common Specifications and Selection of Carbon Fiber Plates
- 1K Carbon Fiber: Fine tows (1,000 filaments/bundle), delicate texture, suitable for appearance parts and high-end models
- 3K Carbon Fiber: Moderate tows (3,000 filaments/bundle), best cost-to-performance ratio, most commonly used for industrial drone primary structural components
- 6K/12K Carbon Fiber: Coarse tows, high production efficiency, suitable for large-sized structural components
- Weave Patterns: Plain weave (balanced strength), twill weave (better impact resistance), unidirectional (maximum axial strength)
3. In-Depth Application of Carbon Fiber Plates in Different Drone Components
3.1 Arms — Ultimate Balance of Lightweight and High Stiffness
Industrial drone arms must simultaneously withstand aerodynamic loads during flight, motor vibration, and landing impacts. Carbon fiber tube or carbon fiber plate laminated and CNC-machined arms can reduce weight by 30%~50% compared to aluminum alloy while providing higher fatigue limits (aluminum alloy approximately 10⁶ cycles @ max stress; carbon fiber can exceed 10⁷ cycles).
Recommended Configuration: 3K plain weave carbon fiber plate, thickness 2.0~3.0mm, tube diameter 25~50mm, layup design dominated by 0° (axial strength) with a small amount of ±45° (torsional resistance).
3.2 Center Plate — Core Load-Bearing Structure
The center plate needs to secure the flight controller, ESC, battery, and other core components while connecting multiple arms and bearing concentrated loads transferred from the arms. A carbon fiber center plate can provide sufficient bending stiffness at 1.0~2.0mm thickness, reducing weight by over 40% compared to aluminum plate while offering better fatigue performance.
3.3 Landing Gear — Impact Resistance and Energy Absorption
The landing gear is the primary load-bearing component when a drone touches down. Carbon fiber plates combined with elastic damping structures can significantly reduce weight while ensuring impact resistance. Some high-end agricultural spraying drones have adopted full carbon fiber landing gear; combined with hydraulic shock absorbers, landing impact acceleration can be reduced by over 30%.
3.4 Propeller Blades — Aerodynamic Efficiency Optimization for Large Drones
Propeller blades for large drones (wheelbase > 1000mm) use carbon fiber plate skin with honeycomb sandwich structure. Compared to pure GFRP blades, they can reduce weight by 20%~30%, improve aerodynamic efficiency by approximately 5%~8%, and directly extend flight endurance by 10~15 minutes (calculated based on a 15L spray tank agricultural drone).
4. Carbon Fiber Plate Machining Considerations
Although carbon fiber plates offer excellent performance, the following points require attention during machining:
- Tool Selection: Carbide or diamond-coated tools must be used. Ordinary high-speed steel tools wear out extremely quickly, increasing machining costs by 3 to 5 times
- Dust Protection: Carbon fiber dust is irritating (to skin and respiratory system). Industrial-grade dust extraction equipment must be installed in the machining workshop
- Edge Treatment: Carbon fiber plate edges have exposed fibers and require paint or edge sealing treatment (epoxy resin coating) to prevent water ingress between layers causing delamination
- Fastening Connections: Countersunk bolts + flange structures are recommended to avoid local stress concentration; adhesive bonding requires specialized carbon fiber structural adhesive
- Internal Stress Control: Large-area carbon fiber plates may develop internal stress after machining; stress relief annealing treatment is recommended
5. Industrial Drone Selection: Carbon Fiber Plates vs. Aluminum Alloy
| Dimension | Carbon Fiber Plates | Aluminum Alloy | Conclusion |
|---|---|---|---|
| Weight | ★★★★★ (Lightest) | ★★★☆☆ | CF Plates Win |
| Strength | ★★★★★ | ★★★☆☆ | CF Plates Win |
| Stiffness | ★★★★★ | ★★★☆☆ | CF Plates Win |
| Cost | ★★★★☆ (Higher) | ★★★★★ (Low) | Aluminum Wins |
| Machining Difficulty | ★★★★☆ (Difficult) | ★★★★★ (Easy) | Aluminum Wins |
| Fatigue Life | ★★★★★ | ★★★☆☆ | CF Plates Win |
| Suitable Scenario | Industrial/Military/High-end | Consumer/Entry-level | Case-dependent |
6. Custom Carbon Fiber Plate Services from Dongguan Chaorong Electronics Co., Ltd.
Dongguan Chaorong Electronics Co., Ltd. provides precision carbon fiber plate processing services, offering drone manufacturers and OEM/ODM brands a one-stop solution from material supply to finished components:
- Customer Material Processing: Customer provides carbon fiber plate raw material; our factory handles cutting, routing, drilling, and surface treatment (sandblasting/polishing/spraying), with full inspection before shipment
- Material Procurement: Agent sales of 3K/6K carbon fiber plates; can recommend optimal specifications (layup/thickness/areal density) based on application
- Batch Customization: Accepts batch processing orders of 100+ pieces; supports production directly from CAD drawings, with discounted batch pricing
- Rapid Prototyping: Small batch samples delivered in 3~5 days, shortening customer R&D cycles and accelerating product iteration
- Technical Consultation: Provides layup design recommendations, connection method suggestions, and machining process optimization support
The company is located in Dongguan, leveraging the complete supply chain of the Pearl River Delta to provide localized, efficient services for drone manufacturers in South China. It has established cooperative relationships with multiple leading industrial drone companies.