Happymodel Mobula7 75mm Freestyle BNF Drone User Manual

1. Introduction

The Happymodel Mobula7 Freestyle BNF (Bind-N-Fly) is a 75mm ultra-light drone designed for freestyle flying. Weighing approximately 24.5 grams, this quadcopter features high-speed RS0802 KV25000 brushless motors and HQPROP 1.6-inch tri-blade propellers, providing an enhanced freestyle experience. It comes equipped with an HDZero AIO5 flight controller and a built-in SPI ExpressLRS 2.4GHz receiver, compatible with ExpressLRS v3.0 firmware.

2. What's Included

Please verify that all items listed below are present in your package:

1x Happymodel Mobula7 Freestyle BNF Drone
1x Spare Canopy
1x Spare Propeller Set
1x Screwdriver
1x Propeller Disassembly Tool

Happymodel Mobula7 drone and included accessories — Figure 2.1: The Happymodel Mobula7 drone along with its included accessories, such as spare propellers, a screwdriver, and a propeller disassembly tool.

3. Specifications

Detailed technical specifications for the Mobula7 drone:

General

Weight: 24.5g (without battery)
Recommended Battery: 1S 450mAh / 550mAh / 650mAh (not included)
Propeller Size: 40mm
UPC: 086972527226
Manufacturer Part Number: M53713 drone

AIO Flight Controller

MCU: STM32F411 (100MHz, 512K Flash)
Gyro: ICM42688P
On-board voltage and amperage meters
Built-in 5A (each) BLHeli_S 4-in-1 ESC (Bluejay ESC firmware pre-installed)
Built-in 5.8GHz HDZero VTX
Built-in SPI ExpressLRS 2.4GHz receiver (compatible with ExpressLRS v3.0)
Built-in 5V 1A BEC
Board Size: 28.5x28.5mm with 25.5x25.5mm mounting holes
Betaflight Firmware: CRAZYBEEF4SX1280 4.5.1 (factory default)

HDZero Lux Camera

Sensor Size: 1/2 inch
Resolution: 720p60 (4:3 and 16:9 aspect ratios)
FOV (4:3): D:155° H:126° V:94°
FOV (16:9): D:145° H:126° V:70°
WDR (Wide Dynamic Range)

Motors

Model: RS0802
Kv: 25000
Stator Diameter: 8mm
Stator Length: 2mm
Shaft Diameter: Φ1.5mm
Weight: 2.0g (each)

Happymodel Mobula7 drone on a digital scale — Figure 3.1: The Mobula7 drone displayed on a digital scale, indicating its approximate weight of 24.5 grams without a battery.

4. Setup

Follow these steps to prepare your Mobula7 drone for its first flight.

4.1 Battery Connection

Ensure the drone's power switch (if present) is in the OFF position.
Connect a fully charged 1S LiPo battery (450mAh, 550mAh, or 650mAh recommended) to the drone's battery connector. Ensure correct polarity.
Secure the battery in the designated battery tray or strap.

4.2 ExpressLRS Receiver Binding

The Mobula7 features a built-in SPI ExpressLRS 2.4GHz receiver. To bind it with your ExpressLRS compatible radio transmitter:

Power on the Mobula7 drone by connecting the battery. The receiver's LED should start flashing slowly.
Power cycle the drone three times rapidly (connect battery, disconnect, connect, disconnect, connect). After the third connection, the receiver LED should flash rapidly, indicating it is in binding mode.
On your ExpressLRS compatible radio transmitter, navigate to the ExpressLRS LUA script or menu and select the 'BIND' option.
Once bound, the receiver LED on the drone will turn solid, indicating a successful connection.
If binding fails, ensure your transmitter's ExpressLRS firmware version is compatible with the drone's receiver (v3.0 or newer recommended).

4.3 Betaflight Configuration (Advanced Users)

The drone comes pre-configured with Betaflight firmware CRAZYBEEF4SX1280 4.5.1. For advanced settings or troubleshooting, you can connect to Betaflight Configurator:

Download and install the latest Betaflight Configurator software on your computer.
Connect the drone to your computer using a USB-C cable.
Open Betaflight Configurator and click 'Connect'.
You can now adjust PID settings, rates, OSD elements, and other advanced parameters. Caution: Modifying settings without proper knowledge can lead to unstable flight or damage.

Top-down view of Happymodel Mobula7 drone showing internal components — Figure 4.1: A top-down view of the Mobula7 drone, highlighting the flight controller, motors, and wiring connections.

5. Operating Instructions

This section provides guidance on safely operating your Mobula7 drone.

5.1 Pre-Flight Checks

Ensure propellers are securely attached and free from damage.
Verify battery is fully charged and securely mounted.
Check for any loose wires or components.
Confirm your radio transmitter is powered on and bound to the drone.
Perform a range check in a safe area before flying.

5.2 Arming and Disarming

The drone's motors will not spin until it is armed. Arming and disarming procedures are typically configured in Betaflight:

Arming: Move the arming switch on your transmitter to the designated arm position. The motors will typically spin slowly, indicating readiness for flight.
Disarming: Move the arming switch back to the disarm position. The motors will stop spinning. In an emergency, you can also disarm by moving the throttle to zero and yawing hard left or right (check your Betaflight configuration for specific emergency disarm gestures).

5.3 Basic Flight Controls

Familiarize yourself with standard quadcopter controls:

Throttle: Controls altitude (left stick up/down for Mode 2).
Yaw: Rotates the drone horizontally (left stick left/right for Mode 2).
Pitch: Tilts the drone forward/backward (right stick up/down for Mode 2).
Roll: Tilts the drone left/right (right stick left/right for Mode 2).

5.4 HDZero VTX Operation

The integrated HDZero VTX transmits video to your HDZero compatible goggles. Refer to your HDZero goggles manual for channel scanning and selection. The VTX settings (power, channel) can typically be adjusted via Betaflight OSD (On-Screen Display) menu using your transmitter sticks or through Betaflight Configurator.

Front view of Happymodel Mobula7 drone with HDZero camera — Figure 5.1: Front view of the Mobula7 drone, showcasing the HDZero camera and propeller guards.

6. Maintenance

Regular maintenance ensures the longevity and optimal performance of your drone.

6.1 Propeller Replacement

Damaged propellers can significantly affect flight performance and safety. Replace them immediately if bent, cracked, or chipped.

Use the provided propeller disassembly tool to carefully remove the old propeller from the motor shaft.
Ensure the new propeller is oriented correctly (clockwise or counter-clockwise rotation as indicated by markings or motor direction).
Gently push the new propeller onto the motor shaft until it sits flush. Do not force it.

6.2 Cleaning

After flights, especially in dusty or grassy environments, clean your drone:

Use a soft brush or compressed air to remove dust and debris from motors, flight controller, and camera.
Avoid using liquids directly on electronic components.

6.3 Motor Care

Inspect motors for any signs of damage or excessive wear. Ensure they spin freely without obstruction. If a motor feels gritty or makes unusual noises, it may require replacement.

6.4 Firmware Updates

Periodically check the Happymodel website or relevant community forums for updated Betaflight or ExpressLRS firmware. Updating firmware can introduce new features, improve performance, or fix bugs. Follow official update guides carefully.

Happymodel Mobula7 drone from a slight angle, showing camera and propellers — Figure 6.1: The Mobula7 drone, illustrating the propeller guards and the HDZero camera, which are key components for both flight and maintenance.

7. Troubleshooting

This section addresses common issues you might encounter with your Mobula7 drone.

7.1 Drone Not Powering On

Check Battery: Ensure the battery is fully charged and correctly connected.
Inspect Connector: Verify the battery connector on the drone is not damaged or loose.
Visual Inspection: Look for any visible damage to the flight controller or power distribution board.

7.2 No Video Signal (HDZero)

Goggle Compatibility: Ensure your goggles are HDZero compatible and powered on.
Channel Match: Verify that your goggles are tuned to the same channel as the drone's VTX.
Antenna Check: Ensure the VTX antenna on the drone and the antennas on your goggles are securely attached.
VTX Power: Check VTX power settings in Betaflight OSD or Configurator.

7.3 Drone Not Arming

Transmitter Link: Confirm your radio transmitter is powered on and successfully bound to the drone (solid receiver LED).
Arming Switch: Ensure the arming switch on your transmitter is correctly configured and activated.
Safety Pre-checks: Betaflight has safety checks. Connect to Betaflight Configurator and check the 'Setup' tab for any warnings (e.g., accelerometer calibration needed, low battery voltage, motor output issues).
Throttle Position: Ensure your throttle stick is at its lowest position.

7.4 Unstable Flight / Drifting

Propeller Damage: Inspect all propellers for damage and replace any that are bent, cracked, or chipped.
Motor Issues: Check motors for debris, loose wires, or signs of damage. Ensure they spin smoothly.
Accelerometer Calibration: In Betaflight Configurator, perform an accelerometer calibration on a level surface.
PID Tuning: For advanced users, minor PID adjustments in Betaflight may be necessary, though the factory tune is generally suitable.

Bottom view of Happymodel Mobula7 drone showing flight controller and battery connector — Figure 7.1: Bottom view of the Mobula7 drone, illustrating the flight controller and the battery connection point, crucial for power and signal integrity.

8. Warranty and Support

Specific warranty information for the Happymodel Mobula7 drone is not provided in this manual. For details regarding warranty coverage, technical support, or service, please refer to the official Happymodel website or contact your retailer directly. Keep your proof of purchase for any warranty claims.

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