Science: Hot Air Balloons

Earlier this term we were visited by several hot air balloonists.  We enjoyed their visit and learned a lot.  Afterwards, we decided to make our own model hot air balloons.  Take a look at the photos below.

The early stages of construction.

"It's almost complete."

"Look, I made a square!"

"Smile!"

"By my calculations, this will require a simple tap here.  Ah, perfect."

Under construction.

"Take off!"

"Good work team!"