| Number of surface parts | l, sm | V0, m/s | V, m/s | f | |
| Theor. | Practical | ||||
| 1 | 69.8 | 70.0 | 0.225 | 0.24 | 0.591 |
| 2 | 58.6 | 60.0 | 0.24 | 0.253 | 0.582 |
| 3 | 64.0 | 70.0 | 0.25 | 0.261 | 0.575 |