Drebule0001 — full quad (OpenFOAM RANS)

Geometry: drebule0001.stl (watertight). Freestream along -Z at density 1.225 kg/m³. Baseline visualization at 42 m/s (~151 km/h).

Pressure at 42 m/s

Full surface (all geometry)

Surface pressure side

Volume slice at Y=0 (hub cross-section)

Slice Y=0

The Y-normal slice passes through the narrow central region; most arm vertices lie away from Y=0, so the slice emphasizes the body. Surface view shows the full STL including arms.

Drag vs speed

Steady incompressible RANS (same mesh), one solve per speed. Drag from forceCoeffs (last 50 iterations averaged).

Speed	U (m/s)	Drag (N)	Cd	Cl
42 m/s (primary)	42.0000	9.8675	0.13718	0.00405
150 km/h	41.6667	9.6623	0.13648	0.00178
170 km/h	47.2222	12.3661	0.13599	0.00079
190 km/h	52.7778	15.5637	0.13702	0.00421
210 km/h	58.3333	18.8730	0.13601	-0.00037
230 km/h	63.8889	22.5992	0.13577	0.00126
260 km/h	72.2222	28.7941	0.13537	0.00260
300 km/h	83.3333	38.2477	0.13507	-0.00203

Higher speeds reuse the same mesh and turbulence settings; values are comparative RANS estimates. Propellers are rigid (no rotation).