Air Propulsion Motor Boats

(Simple Electric Circuit)

Combine the joy and excitement of mechanical toys with your science project by constructing an air propelled motor boat. This is also a good way of learning about simple electric circuits. Your boat will have a battery, a switch and a motor with propeller. This can be used as a science project related to electricity, force or floatation. This idea is good for a display project, an engineering project and an experimental (investigatory) project.

The main structure is made of Styrofoam board that is available at hardware stores and home improvement stores.

Styrofoam air propulsion boat

Materials

Material used in this project are: Simple Switch, Electric Motor, Battery Holder, Propeller, Screws and Wire.

All the material are from the "Simple Electric Circuit Kit"; however, the kit also include light bulb and light holder that may be used for other projects. To utilize the extra material in this project, you may install the light in front side of your boat and use a piece of aluminum foil as reflector.

Boat parts and components

Procedure

Start by cutting the foam. You can cut the Styrofoam easily with utility knives. Just practice for a few minutes and you will get the grip on it. Hold the knife in a sharp angle and don't push too much. You may need to go over the same line a few times until you get a clean cut.

Styrofoam boards can be glued using white glue or wood glue. They can also be painted using any latex paint or water based paint.

Cutting and assembling the boat

Feel free on making your own design. Just reserve a place where you can place the electric motor and secure it with tape.

Battery is a heavy piece; it must be centered in order for your boat to have a balance on water. Adjustments may be made by placing other heavy objects onboard.

Motor placement

Please note that with this method you are not restricted to a boat. You may also make a car that drives by pushing the air backward. You just need for wheels and four nails. Make sure that the wheels are large enough and can spin freely.

To hide the battery and switch, you may also use some cardboard to make a cabin and place it over those parts.

Top view of boat

The boat that you see in the picture does not have a steering mechanism. You may try different possible methods to construct a steeling mechanism in your boat.

Completed air boat

Making a Land & Water Vehicle

Finally you can make a vehicle that can drive both on land and in water. To do that simply attach the wheels to the sides of the boat.

With your kit you may also receive four sheaves that may be used as wheels. Sheaves are almost like the ring in a bicycle; they are just missing the tiers. Students often use sheaves to make pulleys as a part of a simple machine project.

If you did not get sheaves in your kit, use the wheels of any plastic toy car instead.

Car-boat hybrid vehicle

Sheaves are added as a bonus to some of the kits purchased in the beginning of the school year. Material that comes with the kit may be used in many other projects as well.

Kit Components

Switch
Motor
Propeller
Light base
Light bulb
Wire
Screws
Battery holder

Air Propelled Car Example

Two pictures of a simple air propelled electric car. With some creativity and artwork you can make this a must better project.

Air car example 1
Air car example 2

What You Need

The Kit Contains the electric motor, simple switch, battery holder, wire, light bulb, screw base for light bulb, wire, screws and propeller.

You will need additional material and tools such as Styrofoam board, wood, nail, water color, screw driver, battery and utility knife.

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Complete kit contents

Simple Electric Circuit

For a simple electric circuit, you may install the battery holder, switch and light on a board. The switch is missing in this picture.

Simple Electric Circuit Part#KITSEC

Simple electric circuit

Frequently Asked Questions

What type of Styrofoam should I use for the boat?

Use rigid polystyrene foam boards (typically 1-2 inches thick) available at hardware stores. These are lightweight, easy to cut, and provide excellent flotation. Avoid thin packing foam as it's too fragile.

How do I waterproof the electrical components?

Place the battery holder and switch above the waterline. Use waterproof tape or plastic bags to protect connections. Consider coating wire connections with hot glue or silicone sealant for added protection.

Can I use a different motor or propeller?

Yes! Hobby store DC motors (1.5V-6V) work well. Match the propeller size to your motor - larger propellers provide more thrust but require more power. Experiment to find the best combination.

How do I add steering to my boat?

Add a simple rudder behind the propeller using a piece of plastic or cardboard. Attach it with a wire or straw that allows it to pivot. You can control it with a string from the side of the boat.

Safety First

Always have an adult help you with science experiments. Read all instructions carefully before starting, and make sure you have all the materials you need. Have fun and stay safe!