f990dc30_ion__and_Energy__Build_a_Blimp__Explain
[Steps] Tape the propulsion system to the bottom of the straw frame that connects the two Mylar balloons. [Explain] 
Tape the propulsion system to the bottom of the straw frame that connects the two Mylar balloons. Be sure to leave enough space at the open end of the straw so you can pump or blow air into the balloon.
Force, Motion, and Energy: Build a Blimp
Explain