This article is about the Foam Boat that I made. I used a foam packaging material from an electronic device that my father purchased a few month ago.

1. Toy

You can see the toy boat that I made from two brushes and dual wheel movement motor.

I used five 1.5 V AA batteries that can supply 7.5 V (1.5 V * 5 = 7.5 V). I also used a plasticine instead of blue tack because I do not have blue tack. The motor is attached to the foam packaging with a metal spring. However, you can use other materials.

Video - Raymond Island, Victoria, Australia:

2. Testing

On the photo you see that the rotation angle separation between two paint brushes is almost zero or very small. Such alignment would shift the centre of mass of the wheel paint brush spades structure, putting too much mass on one side of this structure and would thus impede the rotational movement of the spades/two wheels.

Thus you see in the video that difference of the rotational angle of the two paint brush spades is 180 degrees of Pi radians: