演講摘要：

此演講將介紹一般無人機與四軸的基本原理、架構、重要組件、測試等等，然後討論四軸無人機的飛行時間限制，並說明我們如何突破此限制，及利用太陽能達到飛行超過三小時，這是目前無化學燃料四軸無人機的飛行時間世界紀錄。

In this presentation, I will first introduce the basic principles of drones and quadcopters, their configuration, key compo-nents, test, …, etc. Then the major drawback of quadcop-ters, the severe limitation of flight time, will be discussed and followed by the possible ways to overcome the time limit by using solar power. So far, we have achieved over 3 hours of flight, which is the world record of flight time for quadcopters without using chemical fuels.