The RS41 unwinder is specifically designed for use with Radiosonde RS41. The unwinder pin tied to the twine is installed to the radiosonde so that it bends the sensor boom into the correct position, ensuring repeatable results in the soundings.
| Material of the string | Cellulose-based |
| Strength (pull) | < 95 N |
| Length of the string | 55 m |
| Unwinder weight with pin | 36 g |
The unwinders are shipped in the radiosonde package, packed separately from the radiosondes. This allows the operator to prepare the balloon and the unwinder at a time that is most convenient.
