iFlight Defender 25 O4 PRO 2.5-Inch Cinewhoop Frame Kit

The iFlight Defender 25 O4 PRO is a 2.5-inch cinewhoop frame kit built to carry the DJI O4 Air Unit Pro for close-proximity, ducted indoor and near-subject flying. The 112mm wheelbase chassis pairs a carbon fibre core with TPU propeller ducts that shield people, pets and gear during tight passes.

Key features

• Injection-moulded 2.5-inch propeller ducts protect the motors and surroundings from contact during close-range flying.
• Vibration-damped camera mount keeps footage smooth and preserves clean gyro data for in-flight and post stabilisation.
• Frame is built around the DJI O4 Air Unit Pro, with mounting for both the O3 and O4 versions of the stack.

Specifications

• Wheelbase: 112 mm
• Frame dimensions: 158 x 155 x 37.5 mm
• Arm and top plate thickness: 2.5 mm
• Max flight stack height: 25 mm (O4 version) / 25.7 mm (O3 version)
• Motor mounting: 9 x 9 mm, φ2 mm
• VTX mounting: 25.5 x 25.5 mm, φ1.6 mm
• Battery: XT30 packs of about 650-1100 mAh (strapping the battery takes a little DIY)
• Weight: approx. 90 g (frame, ducts and hardware)

The kit ships as a bare frame with an anti-spark filter and screw bag; you will still need a whoop-style AIO flight controller, 1404-class motors, 2.5-inch propellers and the DJI O4 PRO system to complete the build.