Gluing
Race car with a balloon motor

In our series "Gluing technique", we would like to offer you technically oriented crafting ideas. Hereby, the main focus lies on the subject "alternative motors" and "energy". In this issue, we would like to present you a race car with a balloon motor.

Downloads.
Further material for this article.

Race car with a balloon motor

In our series "Gluing technique", we would like to offer you technically oriented crafting ideas. Hereby, the main focus lies on the subject "alternative motors" and "energy". In the process of building, the students are supposed to gather experience and technical knowhow, such as stability, hardness, load capacity, drive, energy production and usage.

You can use crafting material, such as cork, plastic film cans, wood sticks and straws. For more stability of the object, the sort of glue is of decisive importance. Therefore, we recommend the use of all-purpose glue. What is special about it is that many different materials can be glued together, cleanly, strongly and fast. To top this series off, we offer you our tried-and-tested easy download templates that are ready to use in class.

 


In this issue, we would like to present you a race car with a balloon motor. Driven by the element "air", this model reaches a top velocity performance of up to 6 km/hr.

Way of functioning

First, air is blown into the balloon. The race car is driven by the air of the balloon. The air escape of the balloon causes an identically strong pressure in the opposite direction. This will move the car.


Air is blown into the balloon through the opening of the film can (blue arrow).The motor of the balloon moves the race car by the air that escapes from it.

You will need the following materials for the balloon race car:
Download template of the car, 1 balloon, 1 cork, 1 thin straw (from a drink pack), 1 plastic film container, wooden stick (shashlik skewer), a pair of scissors, 1 knife and all-purpose glue, a drilling machine with a 10mm drill (used only when accompanied by adults).

This is how it works:

Cut a 2cm long and 1.5cm wide opening into the film container along the long side. The narrow side that shows to the bottom of the film container should be round. Avoid sharp edges and pointy corners.
Drill 2 holes into the floor of the container, in which 2 tightly fitting straws are stuck through. The one will serve as an axis, the other will affix the motor. The holes should have a distance of 2.5 cm between one another.
 
Then stick the balloon into the upper half of the film container. To prevent the balloon from popping while blowing air into it, it is important that there are no sharp edges.
 
Drill a hole into the lid of the container that is 1cm in diameter (using a drilling machine).
 
Then pull the end of the balloon through the cut open lid, so that it can be wrapped around the lid.
 

Now set the lid back on the container. This way, the balloon will jam into the container and cannot slip out of the lid anymore.
The "motor" is completed.

 
A cork from a bottle can be used as wheels for the car. Just cut it into 4 equal parts.
 
Now, it is time to build the chassis, the mainstay for the motor and the tires.
We use the download template for this, which is transferred to a piece of cardboard and then cut out. The corresponding surfaces are folded along the folding edges and glued together with all-purpose glue. Drill the holes just big enough, so that the straw fits through and does not move.
 
Now, stick the approx. 4cm long straw pieces through the holes. Place the motor into the cardboard trough, affix it to the cardboard by using the straws and glue it to the chassis with all-purpose glue.
 
In order to keep the wheels turning smoothly and easily, stick them onto the wooden sticks. Then adjust the bars, so that the wheels turn easily. Finally, the cork plates are glued onto the wooden sticks with all-purpose glue.
 
This is what the race car looks like when it is done. The balloon is blown up and the race car is placed onto a smooth surface. Let it go and it will dash away.
The race car can be primped and painted, so that you can arrange a real car race later on.