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2.2

Major VersionM

by Raghottam Joshi

Introduction

Moving an object using force is known as propelling. Using the energy stored in a rubber band, we make a model of a boat using an icecream stick as the propeller and rudder. This model also demonstrates the mechanism used by ducks and ships to propel themselves forward. Mechanisms similar to the rudder are used by birds, aeroplanes in air and fishes, boats in water to change direction.

Video Overview

    • Exercise caution while using scissors/paper cutter.

    • Be mindful of the pointed end of the toothpick.

  1. Take an empty 30 ml plastic bottle. Mark two points from the neck of the bottle, first at 1 cm and the second at 4 cm. Take two rubber bands and place them around the two markings.
    • Take an empty 30 ml plastic bottle.

    • Mark two points from the neck of the bottle, first at 1 cm and the second at 4 cm.

    • Take two rubber bands and place them around the two markings.

  2. Take the 15 cm cycle spoke and mark a point at 4.5 cm from the screw end of the spoke. Similarly, mark another point at 7.5 cm from the screw end of the same spoke.
    • Take the 15 cm cycle spoke and mark a point at 4.5 cm from the screw end of the spoke.

    • Similarly, mark another point at 7.5 cm from the screw end of the same spoke.

    • Repeat the steps for the other cycle spoke as well.

  3. Gently lift the rubber bands and insert the threaded end of the cycle spoke through them. Make sure the rubber bands rest on the marks made on the cycle spoke. Similarly, insert the other spoke and make sure that the two cycle spokes are placed diametrically opposite to each other.
    • Gently lift the rubber bands and insert the threaded end of the cycle spoke through them.

    • Make sure the rubber bands rest on the marks made on the cycle spoke.

    • Similarly, insert the other spoke and make sure that the two cycle spokes are placed diametrically opposite to each other.

    • The bends of the cycle spokes should face outwards, away from each other.

    • Use an insulation tape to secure the position of the cycle spokes, by sticking the tape along the rubber band and spoke assembly.

  4. Take an ice cream stick and cut one of the rounded edges. Now, make a mark at 5 cm from the straight edge of the ice cream stick. Cut the ice cream stick along the mark using scissors.
    • Take an ice cream stick and cut one of the rounded edges.

    • Now, make a mark at 5 cm from the straight edge of the ice cream stick.

    • Cut the ice cream stick along the mark using scissors.

  5. Take the propeller which is 5 cm long and mark its midpoint  (2.5 cm). Place a rubber band around the marked midpoint of the propeller. Stick a piece of insulation tape on the rubber band to secure it to the propeller.
    • Take the propeller which is 5 cm long and mark its midpoint (2.5 cm).

    • Place a rubber band around the marked midpoint of the propeller.

    • Stick a piece of insulation tape on the rubber band to secure it to the propeller.

  6. We will use the remaining part of the ice cream stick to make our spacer. Mark 3.5 cm from the straight edge of the ice cream stick and cut along the mark. Place the spacer, horizontally, between the two spokes to increase the space between them.
    • We will use the remaining part of the ice cream stick to make our spacer.

    • Mark 3.5 cm from the straight edge of the ice cream stick and cut along the mark.

    • Place the spacer, horizontally, between the two spokes to increase the space between them.

    • Push the spacer down until it touches the base of the bottle.

  7. Stick the spacer to the bottle using insulation tape to avoids the spacer from shifting its position. Now, assemble the body and propeller together. Stretch one end of the rubber band, from the propeller, over one end of the spokes, resting it about 1 cm away from the bent end.
    • Stick the spacer to the bottle using insulation tape to avoids the spacer from shifting its position.

    • Now, assemble the body and propeller together.

    • Stretch one end of the rubber band, from the propeller, over one end of the spokes, resting it about 1 cm away from the bent end.

  8. Take the 4 cm x 4 cm thick foam piece. Make a 2 cm x 2 cm square at one of the corners. Now, cut along the lines of the 2 cm x 2 cm square.
    • Take the 4 cm x 4 cm thick foam piece.

    • Make a 2 cm x 2 cm square at one of the corners.

    • Now, cut along the lines of the 2 cm x 2 cm square.

  9. Now, take the remaining piece of foam and mark a rectangle of dimensions 2 cm x 4 cm. Cut along the 4 cm marked line. We will now have two foam pieces, a square piece having dimensions 2 cm x 2 cm and a rectangular piece having dimensions 2 cm x 4 cm.
    • Now, take the remaining piece of foam and mark a rectangle of dimensions 2 cm x 4 cm.

    • Cut along the 4 cm marked line.

    • We will now have two foam pieces, a square piece having dimensions 2 cm x 2 cm and a rectangular piece having dimensions 2 cm x 4 cm.

  10. Now, take the 2 cm x 2 cm thick foam piece. Pierce a toothpick through the piece of foam from one of the shorter edges, such that the pointed end of the toothpick appears from the opposite edge of the foam piece. Make sure the toothpick is straight while piercing through the foam.
    • Now, take the 2 cm x 2 cm thick foam piece.

    • Pierce a toothpick through the piece of foam from one of the shorter edges, such that the pointed end of the toothpick appears from the opposite edge of the foam piece.

    • Make sure the toothpick is straight while piercing through the foam.

  11. Scoop out a small circular piece of foam, at the centre of the 2 cm x 2 cm foam piece using a paper cutter. The bottle cap should fit snugly into the hole made. Stick the foam piece to the bottle cap using a rubber based glue.
    • Scoop out a small circular piece of foam, at the centre of the 2 cm x 2 cm foam piece using a paper cutter.

    • The bottle cap should fit snugly into the hole made.

    • Stick the foam piece to the bottle cap using a rubber based glue.

    • Let the glue dry for 5 to 10 minutes.

    • Do not use water based glue, as there is a possibility of the foam piece getting detached from the bottle cap while playing.

    • Do not disturb the model until the glue dries.

  12. Take the 2 cm x 4 cm rectangular piece of foam. Mark two points at a distance of 0.5 cm from the shorter edges. Draw a line of length 2 cm from one of the points. This will be our rudder holder.
    • Take the 2 cm x 4 cm rectangular piece of foam.

    • Mark two points at a distance of 0.5 cm from the shorter edges.

    • Draw a line of length 2 cm from one of the points. This will be our rudder holder.

    • Make a small incision at the rudder holder mark using a paper cutter.

  13. Insert the remaining part of the ice cream stick into the rudder holder. Connect the rudder assembly and rudder holder, by piercing the toothpick at the mark made in the rudder holder. While connecting the two (rudder holder and rudder assembly), make sure that the rudder is at least half dipped in water.
    • Insert the remaining part of the ice cream stick into the rudder holder.

    • Connect the rudder assembly and rudder holder, by piercing the toothpick at the mark made in the rudder holder.

    • While connecting the two (rudder holder and rudder assembly), make sure that the rudder is at least half dipped in water.

    • Now, twist the rubber band multiple times with the propeller and release it after placing it in water.

    • Rotate the rudder towards the left or right and see the duck change direction of movement.

    • Water is entering inside the bottle - Check if the bottle cap is tightened properly and if any hole is present along the floating side.

    • Boat is not balanced while floating - Check if the spokes are positioned diametrically opposite to each other. Also, ensure the propeller is exactly in the middle of the rubber band.

  14. Variation 1 : Square shaped model. Variation 2 : Changing size of the bottle. Variation 3 : Use a single ice cream stick as propeller.
    • Variation 1 : Square shaped model.

    • Variation 2 : Changing size of the bottle.

    • Variation 3 : Use a single ice cream stick as propeller.

    • Variation 4 : Use two ice cream sticks as propellers.

    • To learn more about the variations, Boat Model (Variations)

Finish Line

Raghottam Joshi

Member since: 05/02/2017

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