Speedboats designing and making
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Speedboats – Designing and Making Design Brief To design and make a toy speed boat that can be played with at bath time. Design Criteria It will need to: Float Be easy to use Go fast Look attractive Why do things float? They are pushed up by the water. This force is called ‘buoyancy’

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Design brief l.jpg
Design Brief

  • To design and make a toy speed boat that can be played with at bath time.

  • Design Criteria

  • It will need to:

  • Float

  • Be easy to use

  • Go fast

  • Look attractive


Why do things float l.jpg
Why do things float?

  • They are pushed up by the water. This force is called ‘buoyancy’

  • As an object is placed in water, it pushes the water aside to make room for itself. This is called “displacement”

  • To float, an object has to push aside an amount of water that is equal to its own weight

  • Shape is important – it is more likely to float if it has a large surface area. So a clay ball will sink. But the same amount of clay shaped into a bowl will float.


Easy to use l.jpg

switches

Easy to use

  • What do we need to think about?

  • What type of switch and where will it be positioned?

  • Can you change the batteries easily?

  • What if your rubber band comes off the pulley? Can you replace it easily?

  • Is your deck/cabin waterproof?

  • Anything else?


Going fast l.jpg
Going fast

  • What forces will affect your speed boat?

  • Will they speed it up or slow it down?

thrust

air resistance (drag)

water resistance

up thrust (buoyancy)

Gravity (force of attraction)


Looking attractive l.jpg
Looking attractive

  • What do you like or dislike about these boats?


Looking attractive7 l.jpg
Looking attractive

  • In what way are these boats alike?

  • In what way are they different?


Looking attractive8 l.jpg
Looking attractive

  • What do you think these boats are used for?

holidays? racing? touring? fun? rescue? fishing?


Make labeled drawings to show how you would construct your toy boat l.jpg
Make labeled drawings to show how you would construct your toy boat

cabin

pulleys and drive band

stern tube

switch

bow

propeller & shaft

batteries

keel

stern

rudder

motor

hull

  • What materials will you use?

  • Where will you place your electric circuit?

  • Does it meet your design criteria?


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