Frame Specifications

The Bennu frame uses a TBS Source One V5 7" Deadcat as the base, with custom 3D-printed adapter parts for the companion computer, camera, and GPS mast.

Base Frame: TBS Source One V5 7" DC

Spec	Value
Type	7" Deadcat (props out of camera view)
Diagonal (M2M)	~320mm
Weight	~144g
Arm thickness	6mm
Top plate	2mm carbon fiber
Bottom plate	2.5mm carbon fiber
FC/ESC stack mount	30.5x30.5mm and 20x20mm
Open-source files	GitHub (DXF, STL)

Why Deadcat?

The deadcat layout angles the front arms backward so propellers do not appear in downward-facing camera images. This is essential for photogrammetry — props in frame create artifacts in orthomosaics.

Custom 3D-Printed Adapters

These parts are printed in CF-PETG and mount onto the Source One V5 frame.

Part	Est. Print Time	Notes
Pi 4 top plate adapter	~1.5h	Mounts Pi 4 (85x56mm) above the FC stack on M2.5 standoffs
Camera mount	~1h	Bottom-mount for IMX477, 15° forward tilt
GPS mast base	~30min	Clips onto rear standoffs, holds 12mm CF tube vertical
Canopy	~2h	Protects Pi 4 + wiring from wind/debris

Print Settings

Setting	Value
Layer height	0.2mm
Perimeters	3--4
Infill	30--40% gyroid
Nozzle temp	240--250°C
Bed temp	80--85°C
Material	CF-PETG

Nozzle

Use a 0.4mm hardened steel nozzle. Carbon fiber filament wears out brass nozzles quickly.

Non-Printed Components

Part	Qty	Notes
CF tube 12mm OD x 150mm	1	GPS mast
M3x8 button head screws	8	Adapter mounting
M3 heat-set inserts	8	Press into printed adapters
M2.5x6 screws	4	Pi 4 mounting
M2.5 standoffs 10mm	4	FC vibration mount (included with Pixhawk 6C)
Vibration dampening balls	4	FC soft mount

Target Weight

	Weight
Source One V5 7" DC frame	~144g
3D-printed adapters (all)	~30g
Total frame weight	~174g
Target AUW (with 2200mAh)	<750g
Target AUW (with 3000mAh)	<830g