| Whisper 4 | S | SM | M | |
| 2014 | 2014 | 2014 | ||
| In-Flight-Weight | kg | 60 - 90 | 80 - 100 | 90 - 110 |
| Main-Use | Cross | Cross | Cross | |
| Certifications | ||||
| Naked-Pilot | kg | 43 - 73 | 62 - 82 | 71 - 91 |
| Wing-Load | kg/m² | 2,6 - 3,9 | 3,2 - 4,0 | 3,3 - 4,1 |
| Wing-Weight | kg | 5,5 | 5,8 | 6,2 |
| Area | m² | 23,30 | 24,90 | 27,10 |
| Area proj | m² | 20,90 | 22,30 | 24,30 |
| Span | m | 11,70 | 12,10 | 12,60 |
| Span proj | m | 9,80 | 10,20 | 10,60 |
| Ratio | 5,80 | 5,80 | 5,80 | |
| Ratio proj | 4,60 | 4,60 | 4,60 | |
| Rows | ||||
| Boxes | 19 | 19 | 19 | |
| Cells | 55 | 55 | 55 | |
| Closed Cells | 10 | 10 | 10 | |
| Lines Ø diam. | ||||
| Lines distance | m | 7,40 | 7,60 | 8,00 |
| Lines total | ||||
| Flattening | % | 10 | 10 | 10 |
| Accelerated speed | km/h | 52 | 52 | 52 |
| Basic speed | km/h | 42 | 42 | 42 |
| Minimum speed | ||||
| Best-Sink-Rate | ||||
| Best-Glide-Ratio | ||||
| GR/Fmax Estimations | p | 10,0 | 10,0 | 10,0 |
| Upper-Surface | ||||
| Under-Surface | ||||
| Lines type | ||||
| Risers | ||||
| Accelerator | Yes | Yes | Yes | |
| Trims | No | No | No | |
| Ears | Yes | Yes | Yes | |
| B Lines | Yes | Yes | Yes |