3. Tie a string on the unwinder hook.
4. Thread the string through the four holes so that the unwinder is firmly attached to the
other end of the hanger board.
5. Pull the same string through the hole at the other end of the hanger board and attach
the string to the parachute. The string now runs across the hanger board.
3.4 Preparing RS41 Unwinder
When you perform a sounding with no optional accessories, the radiosonde unwinder is
attached directly to the balloon. See option 2 in Figure 4 (page 20).
Visit www.vaisala.com/RS41 to watch a short video on how to attach the unwinder to the
balloon.
It is very important to prepare the unwinder carefully, following the instructions below.
Correct handling of the unwinder ensures a successful sounding.
3.4.1 Detaching Unwinder Stick
To start using the RS41 unwinder, you must first detach the unwinder stick from the
unwinder body.
1. The unwinder stick (number 1 in Figure 5 (page 23)) is attached between two plastic
clips in the unwinder hook (number 2). Detach the stick from between the plastic clips
and pull it out from the unwinder bottom plate (3).
If the unwinder stick is tightly attached to the bottom plate, it is a good idea to
slightly twist the unwinder stick before pulling it out.
RS41-D User Guide M211952EN-C
22
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