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2.1

Minor Versionm

by Kailash NR

Introduction

Using just a couple of straws of different gauge, we create a wonderful propeller, which addresses many concepts in physics

Tools

Parts

Video Overview

    • Exercise caution when using scissors

  1. Take a 10 cm fat straw and bend it into half. Nip the two corners at the centre-fold using scissors. This would give you two diamond holes in the middle of the straw.
    • Take a 10 cm fat straw and bend it into half.

    • Nip the two corners at the centre-fold using scissors.

    • This would give you two diamond holes in the middle of the straw.

    • Make sure the holes are big enough that the thin straw can be inserted easily, but not so big that the straw breaks in half.

  2. Press down each end of the fat straw and seal them with tape. Tape over the end of the straw rather than around it, such that the tape doesn't come off The orientation is very important. In other words, when you look through the diamond holes, both taped ends should look flat to you, i.e. press the back and front and tape the ends.
    • Press down each end of the fat straw and seal them with tape.

    • Tape over the end of the straw rather than around it, such that the tape doesn't come off

    • The orientation is very important. In other words, when you look through the diamond holes, both taped ends should look flat to you, i.e. press the back and front and tape the ends.

  3. Nip one corner using scissors on each taped end of the fat straw such that they are diagonally opposite each other.
    • Nip one corner using scissors on each taped end of the fat straw such that they are diagonally opposite each other.

  4. Fold one end of the thin straw, about 2-3 mm from the edge. Nip just one corner using scissor so that you get a diamond shaped hole close to one end of the straw Nip just one corner using scissor so that you get a diamond shaped hole close to one end of the straw
    • Fold one end of the thin straw, about 2-3 mm from the edge.

    • Nip just one corner using scissor so that you get a diamond shaped hole close to one end of the straw

  5. Insert the thin straw into the diamond holes of the fat one such that the hole in the thin straw lies within the fat straw. Shut the hole-end of the thin straw with your finger and blow through the other end of the thin straw Your straw propeller should now spin!
    • Insert the thin straw into the diamond holes of the fat one such that the hole in the thin straw lies within the fat straw.

    • Shut the hole-end of the thin straw with your finger and blow through the other end of the thin straw

    • Your straw propeller should now spin!

    • The fat straw holes are too small, as a result, the thin straw won't fit loosely for it to rotate.

    • The orientation of the taping is incorrect.

    • The diametrically opposite holes in the fat straw are too small.

    • The holes in the fat straw are not diametrically opposite.

    • The thin straw hole is too far from one end and thereby not within the fat straw.

  6. Play around with the TACtivity and fill the observation sheet.
    • Play around with the TACtivity and fill the observation sheet.

  7. Vary the length of the fat straw (double, half etc) and observe its effect on the speed. Vary the number of holes and observe its effect. Make a hands-free propeller.
    • Vary the length of the fat straw (double, half etc) and observe its effect on the speed.

    • Vary the number of holes and observe its effect.

    • Make a hands-free propeller.

    • Make a propeller using straws of the same gauge.

    • Make a hands-free multi-rotor propeller.

    • To learn and make these variations, please go to Action Reaction - Straw Propeller (Variations).

Finish Line

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Suhail Ahanger

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