The subtitle of the article is: > The US-1, from Impossible Aerospace, can fly for 2 hours If the drones goes at full speed, it loses more energy due to incre

The subtitle of the article is: > The US-1, from Impossible Aerospace, can fly for 2 hours If the drones goes at full speed, it loses more energy due to increased fiction with air and between mechanical parts. So, it reaches neither maximum flight time nor maximum flight range. The optimal speed to reach 75km is probably smaller.