The APC 9x3.9SFR is a 9×3.9 inch, 2-blade propeller weighing 12.1 g.
| Maker | APC |
|---|---|
| Model | 9x3.9SFR |
| Size | 9×3.9 in |
|---|---|
| Pitch | 3.90 in |
| Blades | 2 |
| Rotation | CCW |
| P/D | 0.43 |
| Weight | 0.03 lb |
| Max RPM | 27,000 |
|---|
| Throttle | RPM | Thrust (lb) | Power (W) | Current (A) | Efficiency (%) | g/W |
|---|---|---|---|---|---|---|
| 30 % | 3,774 | 0.24 lb | 14 W | 0.3 | 37.4 | 7.68 |
| 40 % | 4,936 | 0.42 lb | 24 W | 0.5 | 49.9 | 8.04 |
| 50 % | 6,079 | 0.64 lb | 36 W | 0.7 | 60.8 | 8.1 |
| 60 % | 7,203 | 0.90 lb | 51 W | 1 | 69.7 | 7.94 |
| 70 % | 8,305 | 1.21 lb | 72 W | 1.4 | 76.3 | 7.62 |
| 80 % | 9,384 | 1.55 lb | 98 W | 2 | 80.5 | 7.18 |
| 90 % | 10,435 | 1.93 lb | 131 W | 2.6 | 82.6 | 6.66 |
| 100 % | 11,055 | 2.17 lb | 156 W | 3.1 | 82.9 | 6.33 |