GEPRC DarkStar16 O4 AIR Unit Pro HD Quadcopter Instruction Manual

Introduction

The GEPRC DarkStar16 is a compact and agile TinyWhoop quadcopter designed for flexible FPV flying. It features a 1.6-inch frame and is available in two main versions: the O4 Air Unit Pro for a high-definition FPV experience and the WTFPV DIY version for custom builds. This manual provides essential information for safe and effective operation, covering assembly, flight, maintenance, and troubleshooting.

Note: Contents vary by selected WTFPV or O4 Pro specifications. The WTFPV version does not come with any VTX or camera.

Safety Information

• Warning: Not suitable for children under 36 months.
• This product does not include any batteries. Ensure you use compatible and safe batteries.
• Always operate the quadcopter in open, unobstructed areas, away from people, animals, and property.
• Maintain visual line of sight with the quadcopter at all times during flight.
• Familiarize yourself with local regulations regarding drone operation before flying.
• Keep fingers and loose clothing away from rotating propellers.
• Handle batteries with care. Do not overcharge, over-discharge, or damage batteries.
• In case of a crash, immediately disconnect the battery.

Product Features

• Compact Frame: 1.6-inch frame crafted with carbon fiber and injection molding, weighing a mere 86g (O4 Pro version) for easy portability and agile flight in tight spaces.
• 4K Ultra HD Imaging (O4 Pro Version): Equipped with DJI O4 Air Unit Pro VTX, featuring a 1/1.3-inch image sensor, capturing crystal-clear footage at 1080p/100fps with ultra-low latency (15ms) and a max transmission bitrate of 60Mbps.
• 4-Point Damping System: Integrated system effectively reduces frame vibration and 'jello effect' in footage, ensuring stable and clear aerial imaging.
• Lightweight Control, Strong Power: Features compact yet powerful 1003 14800KV motors for a nimble TinyWhoop flight feel.
• Powerful Performance: TAKER F411-12A-E 1-2S AIO flight controller with integrated ELRS 2.4G receiver (in ELRS versions) saves weight by eliminating the need for an extra receiver.
• Quick-Release Modular Design: The VTX module can be detached by removing just 6 screws, simplifying servicing and maintenance.
• Fixed XT30 Power Connector: Ensures simple and secure battery connection.
• Dual Version Options: Choose between the DJI O4 Air Unit Pro version for a new HD FPV experience or the WTFPV version for flexible custom builds (without VTX/camera).

Image: Key imaging and performance features of the DarkStar16 O4 Pro.

Image: Design highlights including handheld size, VTX, power connector, damping, frame, and modular design.

Image: Comparison of the two main versions: O4 Pro (with VTX) and WTFPV (without VTX).

Package Contents

Please check the contents of your package against the list below for your specific version:

DarkStar16 O4 Pro Version

Image: Detailed product list for the DarkStar16 O4 Pro version.

• 1 x DarkStar16 O4 Pro Drone
• 1 x Protective Frame
• 1 x Gemfan 1636-4 Props (2CW + 2CCW)
• 1 x Camera Protector
• 1 x Top Plate
• 2 x IPEX1 5.8G Copper Tube Antenna
• 1 x Receiver Mount
• 1 x M2 Hex Mini Screwdriver
• 1 x Keychain
• 1 x SIM Card Pin
• 1 x Spare screw pack (includes M2*6mm Round Head Hex Screw x6, M2*6mm Flat Head Hex Screw x2, M2*14mm Flat Head Hex Screw x2, M1.4*4mm Round Head Torx Screw x6, M2*3.5mm Pan Head Screw x4, M2*5mm Pan Head Screw x4)
• 1 x Silicone Damping Ball (x2)
• 1 x M2 Metal Hex Nut (x4)
• 1 x M2 Nylon Hex Nut (x2)
• 1 x L-shaped Screwdriver 1.5mm

DarkStar16 O4 Pro WTFPV Version

Image: Detailed product list for the DarkStar16 O4 Pro WTFPV version.

• 1 x GEPRC DarkStar16 O4 Pro WTFPV Drone
• 1 x Protective Frame
• 1 x Gemfan 1636-4 Props (2CW + 2CCW)
• 1 x Camera Protector
• 1 x Top Plate
• 4 x IPEX1 5.8G Copper Tube Antenna
• 1 x Receiver Mount
• 1 x O4 Pro Coaxial Cable 6cm
• 1 x M2 Hex Mini Screwdriver
• 1 x Keychain
• 1 x SIM Card Pin
• 1 x Spare screw pack (includes M2*6mm Flat Head Hex Screw x2, M2*14mm Flat Head Hex Screw x2, M1.4*4mm Round Head Torx Screw x6, M2*6mm Round Head Hex Screw x2, M2*3.5mm Pan Head Screw x2, M2*5mm Pan Head Screw x2)
• 1 x Silicone Damping Ball (x2)
• 1 x M2 Metal Hex Nut (x4)
• 1 x M2 Nylon Hex Nut (x2)
• 1 x L-shaped Screwdriver 1.5mm

Setup

1. Unboxing and Inspection: Carefully remove all components from the packaging. Inspect the quadcopter and all accessories for any signs of damage.
2. Battery Connection: Connect a fully charged LiHV 2S 530mAh battery to the fixed XT30 power connector. Ensure the connection is secure.
3. Propeller Installation: Install the Gemfan 1636-4 propellers. Pay close attention to the rotation direction (CW/CCW) and ensure they are mounted on the correct motors as indicated in the flight controller documentation or motor markings.
4. Receiver Binding (ELRS 2.4G Version): If you have the ELRS 2.4G version, you will need to bind the onboard receiver to your compatible ELRS transmitter. Refer to your ELRS transmitter's manual for specific binding procedures.
5. External Receiver Installation (WTFPV Version): If you have the WTFPV version and plan to use an external receiver, soldering will be required to connect it to the flight controller. Consult the flight controller's wiring diagram for correct connections.
6. VTX and Camera Installation (WTFPV Version): For the WTFPV version, install your preferred VTX and camera. The mounting holes are 25.5x25.5mm (M2). Ensure compatibility and proper wiring. Note that using non-DJI O4 Air Unit Pro components with the O4 Pro version may affect performance.
7. Flight Controller Configuration: For advanced users, PID settings may need adjustment based on flying style and environment. The manufacturer suggests Page 1 PID settings for the O4 Pro version (better outdoors) and Page 2 default PIDs for the WTFPV version (better indoors).

Operating Instructions

1. Power On: Connect the battery. The quadcopter will perform a self-check.
2. Transmitter Connection: Ensure your remote control is powered on and successfully connected/bound to the quadcopter's receiver.
3. Arming the Motors: Follow your flight controller's specific arming sequence (usually a stick combination on your transmitter). The propellers will start spinning at a low idle speed.
4. Takeoff: Gently increase throttle to lift off. The DarkStar16 is suitable for both indoor and outdoor use.
5. Flight Control: Use your remote control to maneuver the quadcopter. The DarkStar16 supports Beginner, Intermediate, and Expert operator skill levels.
6. Video Transmission (O4 Pro Version): If using the O4 Pro version, ensure your DJI Goggles are powered on and connected to receive the HD video feed.
7. Landing: Reduce throttle slowly to land. Once on the ground, disarm the motors immediately.
8. Power Off: Disconnect the battery from the quadcopter after each flight.

Flight Performance Notes:

• Flight Time: Approximately 4 minutes with a LiHV 2S 530mAh battery during low-speed indoor cruising. Actual flight time will vary significantly with aggressive flying and environmental conditions.
• Remote Distance: The quadcopter has a remote control range of up to 1000 meters.
• Video Latency (O4 Pro): Expect low latency: 15ms with DJI Goggles 3 (Race Mode), 22ms with DJI Goggles N3 (Race Mode), and 30ms with DJI Goggles 2 / Integra.

Maintenance

1. Post-Flight Inspection: After each flight, visually inspect the quadcopter for any damage, especially to the frame, propellers, and motors.
2. Propeller Replacement: Check propellers for cracks, bends, or nicks. Damaged propellers can cause instability and reduce flight performance. Replace them immediately if damaged.
3. Cleaning: Keep the drone clean from dust, dirt, and debris. Use a soft brush or compressed air.
4. Screw Tightness: Periodically check all screws, especially those securing the motors, frame, and VTX module. Tighten any loose screws.
5. VTX Module Maintenance: The quick-release design allows for easy detachment of the VTX module (by removing 6 screws) for cleaning or servicing.
6. Battery Care: Follow the battery manufacturer's guidelines for charging, discharging, and storage. Store batteries in a cool, dry place and never leave them unattended while charging.
7. Firmware Updates: Check the GEPRC official website regularly for any available firmware updates for the flight controller or VTX. Updating firmware can improve performance and add new features.

Troubleshooting

• Quadcopter does not power on:
  • Ensure the battery is fully charged.
  • Check the XT30 power connector for a secure connection.
  • Inspect battery wires and connectors for damage.
• No video feed (O4 Pro Version):
  • Verify that the DJI O4 Air Unit Pro VTX and camera are properly connected and powered.
  • Ensure your FPV goggles are powered on and correctly tuned to the VTX frequency.
• Unstable flight or 'jello effect' in footage:
  • Check all propellers for damage; even minor damage can cause instability.
  • Ensure the 4-point damping balls are correctly installed and not damaged.
  • Consider adjusting PID settings in the flight controller software.
• Quadcopter not responding to remote control:
  • Confirm your remote control is powered on and has sufficient battery.
  • Re-bind the receiver to your transmitter.
  • Check for any physical obstructions or interference between the transmitter and receiver.
• Short flight time:
  • Battery may be degraded or not fully charged.
  • Aggressive flying consumes more power; try a more gentle flight style.
  • Ensure you are using the recommended LiHV 2S 530mAh battery.

Specifications

Image: Detailed specifications comparison between the O4 Pro and WTFPV versions.

User Tips

• If you opt for the ELRS 2.4G version, it comes with an onboard AIO receiver. If you prefer to use an external receiver, be aware that soldering will be required for installation.
• The DarkStar16 O4 Pro version is specifically designed to support the DJI O4 Air Unit Pro (with camera). Using other VTX or camera models may lead to compatibility issues or affect performance. The mounting holes are 25.5x25.5mm (M2).
• For optimal flight characteristics, consider the recommended PID settings: Page 1 PID settings are generally better for outdoor flying with the O4 Pro version, while Page 2 default PIDs are tuned for better indoor performance with the WTFPV version.
• The stated flight time of 4 minutes is based on low-speed indoor cruising with a LiHV 2S 530mAh battery. Aggressive maneuvers or flying in windy conditions will significantly reduce actual flight duration.
• Take advantage of the quick-release design for the VTX module. Removing just 6 screws allows for easier access for maintenance, cleaning, or potential upgrades.
• When choosing between versions, the O4 Pro offers a complete, integrated HD FPV experience, while the WTFPV version provides greater flexibility for users who prefer to customize their VTX and camera setup.

Warranty & Support

The GEPRC DarkStar16 comes with a 3-month warranty from the date of purchase. For technical support, troubleshooting assistance, or warranty claims, please contact GEPRC customer service through their official website or your point of purchase. Please have your product model and purchase details ready when contacting support.