PASCO WA-9826 Doppler Rocket - Manual (Page 6)

Doppler Rocket Model No. WA-9826
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8. Have the student nearest the rocket quickly pull apart their handles
in a snapping motion. The Doppler Rocket should “fly” down the
ropes to the other student (See Figure 2).
9. As the rocket approaches, the student at the other end needs to
slightly separate the ropes to slow the rocket.
c) Playing Catch with the Doppler Rocket
An alternative to using the ropes is to have students play a gentle game of
catch with the Doppler Rocket. Simply turn the sound on and have students
toss the rocket around like a ball. As the rocket approaches them, they should
listen for the perceived increase in pitch. As the rocket moves away from
them, they should listen for a decrease in pitch.
Replacing the Batteries
The Doppler Rocket uses an alkaline, 9-volt battery that will require periodic
replacement.
To replace the battery, remove the O-rings on each end and separate the two
adjoining foam halves of the rocket. Insert the replacement battery, align
and combine the adjoining foam halves, and replace the O-rings.