Vortex: Find the Best Release Angle

In groups, students throw the vortex at three release angles guided by a tilted pole and measure each throw. The data show that the real optimal angle is lower than the textbook 45 degrees, and students think about why.

How to play

1. Explain the vortex grip and throw with a three-step approach and the arm extended back (3 min).
2. In groups of four, a partner holds a tilted pole beside the thrower and sets the angle with a phone inclinometer app: 20, 35 and 50 degrees (3 min).
3. Three rounds, one per angle: each thrower takes three throws trying to release the vortex parallel to the pole (10 min).
4. The group measures every throw, averages each angle and plots it on a simple chart (6 min).
5. Discussion: which angle works best, and how do release height and air resistance affect it (3 min).

Rules

• Throw only when the sector judge confirms the landing area is clear.
• The pole holder stands behind the throwing arm, never in front.
• Always walk to retrieve, and everyone goes together on the signal.
• Groups throw side by side at least 15 feet apart.

Variations

Adaptations

• Limited mobility: throws from the wheelchair at the same angles, with the throwing line moved closer to the landing area.
• Autism: gets the order of rounds in writing and keeps the same role before throwing.
• Hearing impairment: the sector judge signals each throw by raising a pinny.

Learning goals

• Understand how release angle affects throwing distance.
• Collect, organize and display data simply.
• Improve javelin throwing technique with a safe implement.

Equipment for a class of 25

• vortex throwers: 7
• poles: 7
• tablets or phones: 7
• tape measure: 7
• worksheets: 7

Teacher tip

A vortex whistles when it flies well, so the sound itself is good feedback. In most groups the best angle ends up between 30 and 40 degrees.

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