1. Introduction
This manual provides essential information for the assembly, integration, and maintenance of your B-CUBE APEX Mini 3 Inch 150mm Carbon Fiber Frame Kit. Designed for FPV freestyle and racing drones, this frame offers a robust and lightweight platform for your build. Please read these instructions carefully before proceeding with assembly.
2. Package Contents
Verify that all components are present and undamaged upon opening the package. The kit includes:
- Carbon Fiber Frame Plates (Arms, Top Plate, Bottom Plate, Side Plates)
- Mounting Hardware (Screws, Standoffs)
- (Optional, depending on order choice) Protective Cover / Propeller Guards
3. Specifications
| Feature | Specification |
|---|---|
| Propeller Size | 3 inch |
| Wheelbase | 150mm |
| Arms Plate Thickness | 4.0mm |
| Top Plate Thickness | 1.5mm |
| Bottom Plate Thickness | 2.0mm |
| Side Plate Thickness | 1.5mm |
| Material | Composite Material (Carbon Fiber) |
| Weight (Frame only) | Approx. 59.0g |
| Recommended Age | 14+ years |
| Use | Vehicles & Remote Control Toys (Airplanes) |
| Technical Parameters (KV) | KV1100 (Typically for motors, not frame) |
| Package Dimensions (approx.) | Length: 25cm, Width: 10cm, Height: 5cm |
| Package Weight (approx.) | 0.07 kg |
Note: The 'Technical parameters: KV1100' typically refers to motor specifications and is listed here as provided with the frame kit information.
4. Assembly Instructions
Follow these steps to assemble your APEX Mini 3 Inch Frame Kit. A basic understanding of FPV drone assembly is recommended.
- Prepare Components: Lay out all carbon fiber plates and hardware. Identify the bottom plate, top plate, side plates, and four arms.
- Attach Arms to Bottom Plate: Secure the four arms to the main bottom plate using the provided screws. Ensure they are oriented correctly and tightened firmly but not excessively to avoid stripping threads or cracking carbon fiber.
Figure 4.1: Bottom plate. 
Figure 4.2: Arms plate. - Install Standoffs: Mount the aluminum standoffs to the bottom plate. These will support the flight controller stack and top plate.
- Attach Side Plates: Secure the side plates to the frame using the appropriate screws and standoffs. These typically form the camera mount and provide structural rigidity.
Figure 4.3: Side plates. - Mount Top Plate: Place the top plate onto the standoffs and secure it with screws.
Figure 4.4: Top plate. - Install Protective Cover (if applicable): If your order includes a protective cover or propeller guards, attach them to the arms as shown in the diagrams.
Figure 4.5: Propeller guards components. 
Figure 4.6: Frame with propeller guards installed. 
Figure 4.7: Assembled frame with protective cover. - Final Check: Ensure all screws are tightened and the frame is rigid.
5. Component Integration
Once the frame is assembled, you can proceed with integrating your electronic components. The frame is designed to accommodate the following (components not included):
- Flight Controller: 20x20mm mounting pattern (Mini F3/F4/F7).
- Motors: Compatible with 1306 / 1406 / 1408 / 1506 / 1507 size motors.
- ESC: Mini 20A-40A Electronic Speed Controllers.
- Propellers: 3-inch propellers.
- Battery: Recommended 3-4S 550-850mAh LiPo batteries.
Refer to the individual manuals of your electronic components for specific installation and wiring instructions. Ensure proper insulation and secure mounting for all parts to prevent short circuits and damage during flight.
6. Maintenance
Regular maintenance will prolong the life of your carbon fiber frame:
- Inspect for Damage: After each flight, check the carbon fiber plates and arms for any cracks, delamination, or stress marks.
- Check Screws: Ensure all screws are tight. Vibrations during flight can cause screws to loosen over time. Apply a small amount of thread-locker (e.g., blue Loctite) to critical screws if needed, but avoid overtightening.
- Clean the Frame: Use a soft brush or compressed air to remove dirt, dust, and debris from the frame, especially around motor mounts and electronic components.
- Replace Damaged Parts: If any part of the carbon fiber frame is significantly damaged, replace it immediately to maintain structural integrity and flight safety.
7. Troubleshooting
This section addresses common issues related to the frame kit:
- Frame Vibrations: If you experience excessive vibrations, check all frame screws for tightness. Ensure motors are securely mounted and arms are not cracked or bent.
- Loose Components: If electronic components become loose, re-secure them with appropriate mounting hardware or double-sided tape. Ensure standoffs are tight.
- Cracked Carbon Fiber: Minor cracks can sometimes be repaired with CA glue and baking soda, but for significant cracks or damage to arms, replacement is recommended for safety.
8. User Tips
- Edge Filing: Gently file the edges of the carbon fiber plates to remove any sharp burrs. This can prevent damage to wiring and reduce the risk of cuts during handling.
- Cable Management: Plan your wiring carefully before installing components. Use zip ties or electrical tape to secure wires and keep them away from propellers and moving parts.
- Thread-locker: For screws that hold motors or arms, a small drop of non-permanent thread-locker (e.g., blue Loctite) can prevent them from vibrating loose during aggressive flights.
- Propeller Guard Use: If using the protective cover/propeller guards, be aware they add weight and can slightly affect flight characteristics. They are excellent for indoor flying or protecting props from minor bumps.
9. Warranty and Support
For warranty claims, technical support, or inquiries regarding replacement parts, please contact the seller or manufacturer directly. Retain your proof of purchase for any warranty-related requests.