He has watched Hermannsburg's school attendance rate climb from 50% to 80% in just three years mainly, he reckons, because the community's women wanted change.

The batteries take one hour to charge and can provide enough power for 15 minutes of autonomous aerobatics at speeds of up to 250kph and a climb rate of around 5.3m per second.

The rate is expected to climb further in the fall and winter, when rental demand is weaker, pushing vacancies to the highest levels since Reis began its count in 1980.