How is it going?

We made the car to carry the container. And we programmed it to go forward and then come back.

Any troubles?

It keeps breaking. The engine falls off. It goes forward but when it turns... but it.. when it goes backwards it falls off. See?

What is your plan for next day? Is the motor too strong?

We'll add more legos to it.

Mostly to the top.

Yup, to the top and hold it in close [to the RCX unit] and it will hold it.

Hey, you beefed up the mounting around the motor. Is it falling off?

No it is OK.

Here are different sizes of gears. Why don't you play with these and see what you can come up with.

... How are things going?

The motor goes too fast so we put the big gear on it. The little gear is on the wheel so it goes slower.

Have you tested it?

Not yet. We're going to do that now.

... How did your test go?

We fixed it. This gear has to go on the motor. It has 15 teeth so the motor goes around and 15 teeth go by and this [the gear attached to the wheel] is 24 so look here... you have nine more before it goes around once.