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1.1

Minor Versionm

by Procheta Mallik

Introduction

Take a small strip of paper and cut right down the middle of the long edge to make two strips to a third of the length. Split the two strips to create a 45-60 degree angle between them and throw them up and enjoy them rotate as they come down.

Tools

Video Overview

    • Handle Scissor with care.

  1. Mark Three lines on the rectangular strip as shown in the figure Make cut along the lines you drew
    • Mark Three lines on the rectangular strip as shown in the figure

    • Make cut along the lines you drew

    • The length of two vertical lines mentioned in the picture is 1/3 of the width of paper.

  2. Fold the sides onto each other along the vertical axis Fold the bottom of the body so that it locks the  vertical folds you made on the above step. Stick Cellophane tapes, if necessary.
    • Fold the sides onto each other along the vertical axis

    • Fold the bottom of the body so that it locks the vertical folds you made on the above step.

    • Stick Cellophane tapes, if necessary.

  3. Keeping the vertical cut as reference,  gently fold the "Propellers" in opposite directions so that it looks like 'V' from the side.
    • Keeping the vertical cut as reference, gently fold the "Propellers" in opposite directions so that it looks like 'V' from the side.

  4. Drop the roto-copter from a decent height to see it in action as it rotates about the vertical axis and descend slowly.
    • Drop the roto-copter from a decent height to see it in action as it rotates about the vertical axis and descend slowly.

    • "Propeller" length too short

    • Not enough Surface area for propellers to work efficiently

    • Stick a cassette tape to the bottom of the roto-copter and measure the speed in RPM!

    • Make roto-copters of different sizes, drop it from the same height and compare their speeds.

Finish Line

Kailash NR

Member since: 05/02/2017

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