Captain Dino's Adventure Through the Water

Today we made a different kind of boat than we made before.  A few weeks ago we made a boat that moves by using a fan to push air backwards.

We needed empty plastic water bottles for the boat, but our bottles were full of water, so Cici and I raced Adam to see who could finish their bottle first.  Adam lost because he is super super so-so.

 We made holes in the bottles so we could put an axle through the middle.  Then we put a big red disc in the middle, and put paddles on each end.  The popsicle sticks push the water so the boat will go:

Look the dinosaur is being a captain on the boat.

Then we made our circuit with a battery, a switch, and a motor.  We had to make sure we connected the wires so that the motor would make the boat go forward instead of backward.  The motor uses a rubber band help the paddles have a stronger force.  The motor has to go around 9 times to make the paddle go around 1 time.  This is a kind of mechanical advantage.

This is the rubber band that takes energy from the motor and sends it to the paddles.

We put a little toy dinosaur on the boat for fun.  Then we went outside to try the boat in the water.

It's almost time for Captain Dino to have a ride. 

Ta-da!  The boat went really well.  It moved and it didn't sink.  But the dinosaur did not have a good time.  He fell in the water, I ran home to get a net, and Cici saved him.

Captain Dino is on the way to the island.

Do you want to know what happened to Captain Dino?  He sunk, but someone saved him.  He still has a chance to go to the island.  I don't know when Captain Dino will have an adventure with us again.