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1.3

Minor Versionm

by Kailash NR

Introduction

Cut 4 to 5 blades at the top of a plastic bottle and insert a spoke through the centre of the bottle. Now twist the blades all in the same direction. Place the bottle and spoke assembly under a fan and enjoy seeing the wind turbine model.

Video Overview

    • Exercise caution while using scissors/ cutter or any sharp tool.

  1. Stick coloured insulation tapes along the wall of the bottle to ensure good visibility when the bottle is under spin. Draw  five flower "petals" like profile on the bottle top as shown  in the figure. "Petals" are nothing but turbine blades!
    • Stick coloured insulation tapes along the wall of the bottle to ensure good visibility when the bottle is under spin.

    • Draw five flower "petals" like profile on the bottle top as shown in the figure.

    • "Petals" are nothing but turbine blades!

    • Stick at least one colour of insulation tape on the petal area.

    • Cut down the "petals" to the bottle cap using Scissor/Paper cutter.

  2. Bend all five petals at right angle towards the bottle cap. Twist the petals to any side to  make the blade profile.
    • Bend all five petals at right angle towards the bottle cap.

    • Twist the petals to any side to make the blade profile.

    • It is important that you twist all petals to one particular side.

  3. Heat any thick metal wire piece (at least 10 cm long) on a candle to make hole in the bottle cap. Make a hole at the centre of the bottle base also. The bottle must spin freely on the spoke.
    • Heat any thick metal wire piece (at least 10 cm long) on a candle to make hole in the bottle cap.

    • Make a hole at the centre of the bottle base also.

    • The bottle must spin freely on the spoke.

    • Allow the spoke to cool down after making holes.

  4. Pass the spoke through the bottle from cap to the base with the bent side above the cap. Secure the spoke with the provided spoke nut .
    • Pass the spoke through the bottle from cap to the base with the bent side above the cap.

    • Secure the spoke with the provided spoke nut .

  5. Suspend the bottle by holding it just under the spoke nut and keep it under a rotating ceiling fan or else blow air from mouth vertically down on to the blades.
    • Suspend the bottle by holding it just under the spoke nut and keep it under a rotating ceiling fan or else blow air from mouth vertically down on to the blades.

    • Holes are too small for the bottle to spin.

    • Untwisted blades or blades not twisted enough.

    • Ceiling fan's speed is too low to make the bottle spin.

  6. Initially place the turbine on the ground and switch on the ceiling fan. Gradually lift the turbine towards the fan until it starts to spin. Measure the distance from ground to the turbine using a measuring tape.
    • Initially place the turbine on the ground and switch on the ceiling fan.

    • Gradually lift the turbine towards the fan until it starts to spin.

    • Measure the distance from ground to the turbine using a measuring tape.

    • Do not increase the height of turbine once it starts to spin

    • Repeat the same for different orientations of blade profiles, and tabulate.

  7. Variation 1: Make a double bladed turbine and observe its behavior. Variation 2: Try making a turbine with just the upper half of the bottle. Variation 3: What would happen if we used card board pieces instead of plastic bottles?
    • Variation 1: Make a double bladed turbine and observe its behavior.

    • Variation 2: Try making a turbine with just the upper half of the bottle.

    • Variation 3: What would happen if we used card board pieces instead of plastic bottles?

    • To make these turbines refer 'Wind Turbine Model - Variations'

Finish Line

Attached Documents

Kailash NR

Member since: 05/02/2017

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