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3.6

Major VersionM

by Raghottam Joshi

Introduction

The wave turbine is made using a plastic bottle, cardboard strip (which acts as a turbine) and thick wire (which is used to mount the turbine on top of a bottle, whose base has been removed). When this bottle is bobbed up and down in a bucket of water, the water exerts pressure on the air in the bottle which is ejected through a hole in the bottle cap to rotate the turbine.

Video Overview

    • Exercise caution when using scissors and paper cutter.

    • Beware of open safety pins and ensure to close them, to avoid getting pricked.

    • Mind the pointed ends of the binding wire, which can be sharp.

    • Beware of the cut end of the bottle, as it may be sharp.

  1. Take a cardboard strip of length slightly more than 12cm (say 12.7cm) and breadth 1.5cm. Mark at 2cm from one end of the cardboard strip. Now, place your finger at the marking and fold it backward, as shown in the picture.
    • Take a cardboard strip of length slightly more than 12cm (say 12.7cm) and breadth 1.5cm.

    • Mark at 2cm from one end of the cardboard strip.

    • Now, place your finger at the marking and fold it backward, as shown in the picture.

  2. Fold them back and forth, like an accordion, with each fold about 2cm in length. Open the folds to get a zigzag pattern of the cardboard strip. Open the folds to get a zigzag pattern of the cardboard strip.
    • Fold them back and forth, like an accordion, with each fold about 2cm in length.

    • Open the folds to get a zigzag pattern of the cardboard strip.

  3. Apply glue on one of the sides of the cardboard strip, preferably on the rougher side. The cardboard strip has six faces, indicated as 1, 2, 3, 4, 5, 6 in the image. The cardboard strip has six faces, indicated as 1, 2, 3, 4, 5, 6 in the image.
    • Apply glue on one of the sides of the cardboard strip, preferably on the rougher side.

    • The cardboard strip has six faces, indicated as 1, 2, 3, 4, 5, 6 in the image.

  4. Join faces 4, 5 and 2, 3 to make the blades of the turbine. Apply glue at the middle of the 8cm long, thick binding wire. Apply glue at the middle of the 8cm long, thick binding wire.
    • Join faces 4, 5 and 2, 3 to make the blades of the turbine.

    • Apply glue at the middle of the 8cm long, thick binding wire.

  5. Place the binding wire at the intersection of faces 1 and 6. Now, join faces 1, 6 to make the final blade of the turbine. Make sure that the binding wire is placed at the centre of the turbine blades.
    • Place the binding wire at the intersection of faces 1 and 6.

    • Now, join faces 1, 6 to make the final blade of the turbine.

    • Make sure that the binding wire is placed at the centre of the turbine blades.

    • The turbine blades have to stick firmly to the binding wire and shouldn't move.

  6. Make a hole, slightly off-centre, in the bottle cap using scissors. Take a long strip (about 12cm) of tape and place a safety pin about 2cm  from one end of the tape. The safety pin has to be placed with its head on the sticky side of the tape.
    • Make a hole, slightly off-centre, in the bottle cap using scissors.

    • Take a long strip (about 12cm) of tape and place a safety pin about 2cm from one end of the tape.

    • The safety pin has to be placed with its head on the sticky side of the tape.

  7. Fix the safety pin along with the tape on one of the sides of the bottle cap, with one end of the tape left open. Place another safety pin diametrically opposite the first one and seal it with the open end of the tape. Ensure that the two safety pins are positioned parallel to each other with the hole in the cap positioned between the parallel safety pins, as shown in the picture. This type of positioning is necessary for air to hit the turbine blades directly.
    • Fix the safety pin along with the tape on one of the sides of the bottle cap, with one end of the tape left open.

    • Place another safety pin diametrically opposite the first one and seal it with the open end of the tape.

    • Ensure that the two safety pins are positioned parallel to each other with the hole in the cap positioned between the parallel safety pins, as shown in the picture. This type of positioning is necessary for air to hit the turbine blades directly.

    • Place your turbine between the two safety pins by inserting the binding wire through the holes of the two safety pins as shown in the picture.

    • The turbine with its blades should be able to rotate freely between the safety pins.

  8. Take a plastic bottle and cut its base off, using scissors/ paper cutter. Close the bottle with the turbine cap. Fill a vessel with water as shown.
    • Take a plastic bottle and cut its base off, using scissors/ paper cutter.

    • Close the bottle with the turbine cap.

    • Fill a vessel with water as shown.

    • Note that the diameter of the vessel should be bigger than the diameter of the bottle with turbine so that the turbine model can be placed inside the vessel easily.

  9. Place your turbine bottle in the vessel filled with water and move it up and down. The bobbing motion causes a jet of air to come out of the bottle cap hole, which in turn spins the turbine. The bobbing motion causes a jet of air to come out of the bottle cap hole, which in turn spins the turbine.
    • Place your turbine bottle in the vessel filled with water and move it up and down.

    • The bobbing motion causes a jet of air to come out of the bottle cap hole, which in turn spins the turbine.

    • The turbine blades do not spin freely - This could be possible due to the following scenarios:

    • Length of the turbine bottle is small.

    • The turbine blades are not directly above the hole or if the turbine is not firmly fixed.

    • The safety pins aren't placed opposite each other or are not at the same height.

    • The up-and-down motion of the turbine bottle in the water is not fast enough

    • If the safety pins are too short, or the turbine blades are too long, then the blades would hit the bottle cap and prevent the turbine from spinning freely.

    • The jet of air hitting the centre of the turbine would not cause any rotation if the bottle cap hole is right at the centre.

    • If the safety pins are too long or blades too short, then the distance between the blades and the bottle cap is too large, hence reducing the effect of the jet of air.

Finish Line

Vishal Bhatt

Member since: 04/26/2017

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81 Guides authored

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