Jerzy Chojnacki

All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.

All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.

2.1. Test Stands For the experiment, a laboratory stand was prepared, which ensured precise and repeatable measurements of the drone’s movement speed, altitude above the tree, and propeller spin speeds. On the stand, the drone was affixed to a rolling cart on rails supported by fixed structures at opposite ends. The cart was then pulled by an electric motor and a rope connected to the cart.