It’s winter and I’m cold and bored. So it’s time for another fun building project. My decision to leave my Ranger EX as a normal APM Plane left me with the 31" (800mm) quad booms. In reverse design fashion, I seem to have found a home for them in the Zeta FX–79 Buffalo flying wing.
The 2000mm wingspan with large prop in the rear makes it a difficult, unsafe plane to hand launch. Converting it to a quadplane eliminates these concerns. The design has a flat bottom airfoil with easily removable wings. The FX-79 dimensions, weight, and forward flying power system are similar to the Ranger EX but has a favorable mounting position for the quad booms that can make it a dedicated conversion while also retaining some travel convenience.
SunnySky X3508 700kv motors - BuddyRC $28.50
TM 12x5.5" Carbon Fiber CW CCW Propeller - RC Timer (4 pairs) $25.
NFS ESC 45A Multi-Rotor ESC SimonK Firmware (OPTO) - RC Timer $12.86
4mm Male to 3.5mm Female Adapters from HK - $1.85/set
HXT4mm w/12AWG Silicon Wire 10cm (Battery Side)
HXT4mm w/12AWG Silicon Wire 10cm (ESC side)
Metric Hardware and 42mm Cross Hole Motor Mounts:
NTM Prop Drive 35 Series Accessory Pack - $1.89/ea
M10410 - M3x25mm Flat Head Socket Cap Screw – 0.5 Pitch - Black - $0.23/ea
M50350 - M3x.5 Nylock Nut - $0.04/ea