Both sound sources: whirring and selected sounds:

 

 

Mixing board, line out socket and main amplifier: 

 

 

3 photos showing beginning of building the harness to support the balloon:

 

 

 

GPS/LCD board with basic info on screen:




Speed test experiment:

 

 

Temporary supports added to either the top or bottom:

 




Experimental rig for measuring speed of the motors, each has 3 tests and the driving circuit can be tuned for consistency (invalid data shown, not in use yet):

 

 

2nd method again for motor speed assessment - rotary encoders and read on a separate PC to the one controlling the motors: