Update – Prototype balloon

A week later, and the balloon is still (at least partially) inflated.

Tasks for this week involve working out the optimal pressure for the HAB – too low and it won’t get off the ground, too high and it will leak under its own pressure. As the altitude increases pressure decreases rapidly, and at an altitude of approximately 13km the external pressure will be less than one fifth of that on the ground. Without pre-stretching the balloon and the right internal pressure, our project will not get very far off the ground!