Model-F OWA Assembly Instructions

Unpack and Inspect Frame Kit

Lay out all frame components and hardware. Verify you have:

• Top plate (main body)
• Bottom plate
• Arms x4 (or integrated X-frame)
• Standoffs (M3 aluminum, ~25-30mm)
• M3 screws (various lengths)
• Camera mount hardware

Assemble Arms to Bottom Plate

If using separate arms, attach each arm to the bottom plate using M3x8 screws. Use 2 screws per arm.

• Apply small drop of Loctite 243 to each screw
• Tighten in star pattern (opposite corners)
• Verify arms are seated flat against plate

Install Standoffs

Thread M3 standoffs (25-30mm) into the bottom plate at the 4 corner mounting positions.

• Hand-tighten first, then use hex driver
• Standoffs will support the electronics stack
• Verify all are same height

Motor Position Reference (Props Out)

Standard Betaflight "Props Out" configuration:

        FRONT

    M4 (CCW)     M2 (CCW)
         \       /
          \     /
           \   /
            \ /
             X
            / \
           /   \
          /     \
         /       \
    M3 (CW)      M1 (CW)

        REAR

Motor 1 (Rear Right): CW  - Props spin inward
Motor 2 (Front Right): CCW - Props spin inward
Motor 3 (Rear Left): CW   - Props spin inward
Motor 4 (Front Left): CCW - Props spin inward
                        

Mount Motors to Arms

Use 4x M3 screws per motor (typically M3x6 or M3x8):

• Thread screws through motor base into arm
• Apply Loctite 243 to each screw
• Tighten in cross pattern
• Do NOT overtighten (can strip threads)

Route Motor Wires

Run motor wires along the arms toward the center:

• Keep wires away from prop arc
• Use zip ties or tape to secure
• Leave enough slack for ESC connection
• Note: Wire order determines rotation direction

Prepare ESC

The 4-in-1 ESC sits on the bottom plate, supported by the frame standoffs:

• Clean ESC with isopropyl alcohol
• Apply double-sided tape or soft mount to bottom
• Identify motor output pads (M1-M4)
• Identify battery input pads (B+ / B-)

Solder Motor Wires

Solder each motor's 3 wires to the ESC motor pads:

• Tin pads and wire ends first
• Use 350-380°C iron temperature
• Keep joints clean and shiny
• Match motor positions: M1=Rear Right, M2=Front Right, M3=Rear Left, M4=Front Left

Solder Power Input

Solder battery lead wires to ESC power pads:

• Use 12-14 AWG silicone wire
• Red = Positive (B+)
• Black = Negative (B-)
• Add 35V 1000uF capacitor across B+/B- (close to ESC)
• Add XT60 connector at end

Mount Flight Controller

FC mounts above ESC using soft-mount grommets or standoffs:

• Use soft-mount grommets to reduce vibration
• Align FC arrow with frame forward direction
• Connect FC to ESC via ribbon cable or solder pads
• Verify UART, power, and signal connections

Connect ESC to FC

Connection between ESC and FC varies by model. Common methods:

• Ribbon Cable: Plug directly if using matched FC/ESC
• Solder Pads: Connect ESC signal wires to FC motor pads
• Verify 5V/GND power from ESC BEC to FC

Mount GPS Module

GPS should be mounted on a mast, away from electronics:

• Use 4" carbon fiber or 3D printed mast
• Mount at rear of frame, above battery area
• GPS antenna faces UP (sky-facing)
• Arrow on GPS points forward
• Keep away from VTX and ESC (interference)

Connect GPS to FC

GPS connects via UART (serial port):

• GPS TX → FC RX (on selected UART)
• GPS RX → FC TX (on selected UART)
• 5V → 5V
• GND → GND
• Note which UART for Betaflight config

Clean Up Wiring

Organize and secure all wires:

• Bundle wires with small zip ties
• Keep signal wires away from power wires
• Ensure no wires can contact props
• Leave service loop for battery lead

Mount FPV Camera

Camera mounts in the front of the frame:

• Adjust tilt angle: 25-35° typical for FPV flight
• Use included mounting hardware
• Ensure lens is protected from prop strikes
• Secure with appropriate screws

Wire Camera

Camera wiring (3 wires typical):

• Yellow/White = Video signal → VTX video in
• Red = Power (5V) → FC 5V out or VTX 5V out
• Black = Ground → Common ground

Mount VTX

VTX placement considerations:

• Mount with antenna connector accessible
• Keep away from GPS (interference)
• Ensure adequate cooling (airflow)
• Use double-sided tape or zip ties

Wire VTX

VTX connections:

• Video In ← Camera video out
• Power (7-26V typical) ← Battery voltage or regulated
• GND ← Common ground
• Smart Audio/Tramp ← FC UART TX (for OSD control)

Install VTX Antenna

Antenna installation is critical:

• Use RHCP (Right Hand Circular Polarized) antenna
• Ensure connector is secure (MMCX, UFL, or SMA)
• Mount antenna vertical or at 45° angle
• Keep antenna away from carbon (blocks signal)

Mount Receiver

Receiver placement:

• Mount away from ESC and VTX (interference)
• Use double-sided tape or zip ties
• Ensure antenna can be routed externally
• Consider crash protection

Wire Receiver

Crossfire Nano connections:

• TX → FC UART RX (UART1 typical)
• 5V → FC 5V
• GND → FC GND
• Note: Crossfire uses CRSF protocol (serial)

Install RX Antenna

Crossfire Immortal-T antenna:

• Route antenna away from carbon frame
• Secure with zip tie at frame edge
• Keep antenna element straight, not coiled
• 915MHz range - antenna should be ~8cm exposed

Print/Source Mount Plate

The MF-BPH-001 frame adapter:

• 3D print in PETG or ABS (strength required)
• 100% infill recommended
• Dimensions: 80mm x 50mm x 8mm
• Features dovetail rail on bottom

Attach to Frame Bottom

Mount plate attaches to underside of main frame:

• Align with center of frame
• Use 4x M3x8 screws through frame holes
• Apply Loctite to screws
• Verify plate is level and centered

Print/Source Payload Cradle

The MF-BPH-002 cradle:

• 3D print in PETG or ABS
• 100% infill for structural integrity
• Dimensions: 80mm x 70mm x 60mm internal cavity
• Features dovetail interface on top
• Strap slots on sides

Install Release Servo

For servo-actuated release (optional):

• Mount 9g servo in designated pocket
• Connect servo to FC SERVO output
• Wire: Signal → FC servo pad, 5V → 5V, GND → GND
• Test servo movement range

Attach Cradle to Mount

Slide cradle onto mount plate rail:

• Align dovetail interfaces
• Slide cradle forward onto rail
• Verify secure engagement
• Add retention pin/clip if designed

Load Payload

Payload insertion procedure:

• Insert payload into cradle cavity
• Center payload for balanced CG
• Secure with retention straps
• Verify payload cannot shift in flight
• Check total weight is within limits

Install Top Plate

Secure the top plate:

• Verify all wires are tucked inside
• GPS mast passes through or around plate
• Use M3 screws into standoffs
• Don't overtighten (carbon can crack)

Install Battery Strap

Add battery mounting system:

• Thread strap through frame slots
• Add non-slip pad on top plate
• Test strap tension

Install Propellers (For Testing Only)

Prop installation for motor spin test:

• Match CW props to CW motors (M1, M3)
• Match CCW props to CCW motors (M2, M4)
• Hand tighten prop nuts
• Verify props spin freely, no rubbing

Connect to Betaflight Configurator

Initial connection:

• Download Betaflight Configurator (Chrome app)
• Connect FC via USB
• Install drivers if needed (STM32 Virtual COM Port)
• Select correct COM port and Connect

Ports Configuration

Configure serial ports:

• UART1: Serial RX → Enable
• UART2: GPS → Enable (if GPS on UART2)
• UART3: VTX (TBS SmartAudio) → Enable Peripherals
• Save and Reboot

Configuration Tab

Essential settings:

• Mixer: Quad X
• ESC/Motor Protocol: DShot300 or DShot600
• Motor Direction: Props Out
• Receiver: Serial, CRSF protocol
• GPS: Enable if installed
• Arming: Set appropriate angle limit

Motor Test (PROPS OFF!)

Verify motor operation:

• Go to Motors tab
• Enable motor test mode
• Slide each motor to ~20%
• Verify correct motor responds
• Verify correct spin direction
• Fix any reversed motors (swap wires or BLHeli direction)

Bind Crossfire Receiver

Binding procedure:

• On Tango 2: Menu → Crossfire → Bind
• Power on drone (receiver in bind mode or button press)
• Wait for solid green LED on receiver
• Verify in Betaflight Receiver tab: channel values move with sticks

Channel Mapping

Standard channel assignment:

• CH1: Roll (Aileron)
• CH2: Pitch (Elevator)
• CH3: Throttle
• CH4: Yaw (Rudder)
• CH5: Arm switch
• CH6: Flight mode
• CH7+: AUX functions (beeper, etc.)

Set Failsafe Behavior

Critical safety setting:

• Go to Failsafe tab
• Set Stage 1: Hold last values
• Set Stage 2: Drop (disarm) or GPS Return (if equipped)
• Test by turning off transmitter
• Verify motors stop within 1 second

Use Smoke Stopper

First power-on procedure:

• Connect smoke stopper between battery and drone
• Watch for smoke stopper LED/buzzer
• If smoke stopper trips: STOP - find short
• If no trip: proceed to next step

Video System Test

Verify FPV video:

• Power on goggles
• Power on drone
• Verify video feed on goggles
• Check for interference/static
• Test OSD displays (if configured)

GPS Lock Test

Verify GPS operation:

• Take drone outside (clear sky view)
• Wait for GPS lock (green LED on GPS)
• Verify satellite count in OSD or Betaflight
• Minimum 6 satellites for reliable position

Control Response Test

Verify control inputs (PROPS OFF):

• Arm drone (may require throttle down + switch)
• Move sticks gently
• Listen for motor speed changes
• Verify pitch, roll, yaw respond correctly
• Disarm immediately after test

Hover Test

First hover procedure:

• Go to open outdoor area (no people/obstacles)
• Install propellers (final check on direction)
• Set drone on level ground
• Arm and slowly raise throttle
• Hover at 1-2 meters
• Check for stability, any drift or oscillation
• Land and check motors (not hot = good)