Explore how diameter, pitch, rpm, voltage, CdA, mass, motor limits, and battery size interact. The real-build estimates use sea-level drag power and loaded_rpm ≈ 0.7 · Kv · V.
Mass is derived from airframe, battery, and motor masses. CdA rows use drag power for cruise and top-speed estimates.
All-up mass
562 g
220 airframe + 210 battery + 4× 33 motor
Pitch vs rpm
rpm required from pitch: 32808.5
chosen rpm: 40,000
Mach vs rpm
max rpm (M_adv ≤ 0.9): 40636.0
tip Mach: 0.9
advancing Mach: 0.9
Prop absorption model
Kv needed: 2597 rpm/V
Absorbed prop power: 1.42 kW
Feasible? Yes
Mass & endurance sanity
Static thrust (4× props): 169.4 N
Thrust-to-weight: 30.73 ×
Absorption-model endurance: 1.2 min
Absorption-model range: 6.0 km
| CdA | Drag power | Power margin | Max speed | Limiter | Endurance | Range | Run energy | Runs | After planned |
|---|---|---|---|---|---|---|---|---|---|
| 0.0030 | 1.64 kW | +1.76 kW | 364 km/h | Mach limit | 1.0 min | 5.2 km | 9.3 Wh | 3.1 | 0.6 Wh / 0.0 min |
| 0.0060 | 3.27 kW | +0.13 kW | 302 km/h | drag power | 0.5 min | 2.6 km | 10.1 Wh | 2.8 | 0.0 Wh / 0.0 min |
| 0.0100 | 5.45 kW | -2.05 kW | 256 km/h | drag power | 0.3 min | 1.6 km | 10.0 Wh | 2.9 | 0.0 Wh / 0.0 min |
| 0.0150 | 8.18 kW | -4.78 kW | 222 km/h | drag power | 0.2 min | 1.0 km | 9.7 Wh | 3.0 | 0.0 Wh / 0.0 min |
One max-speed run assumes acceleration from rest plus 10s held at estimated max speed. Mass affects top speed through thrust-to-weight here; power-limited top speed is mostly CdA and motor power.