![]() To keep a good control authority, the maximum thrust achievable by the propeller should be about twice the hovering thrust. Here, our drone weighs 777 g, so we need a total thrust of 7.6 N to hover or 1.9 N per propeller.įigure 2: Drone weight and hover thrust requirements At hover, we can assume that the combined thrust of the propellers is equal to the drone’s total weight.įrom this assumption and with the weight of the drone, we can deduce the thrust required by each propeller in order to maintain hover. The rotation of the propellers generates thrust and allows the drone to rise and maintain flight. A drone’s weight is the product of its mass times gravity and drag is the force resisting the drone's motion through the air, which is dependent on reference area, air density and flow velocity. In order for a drone to become airborne, it must overcome its weight and drag. The first step is to understand how a drone can fly and take-off. With this current design, our flight time is ≈ 4 minutes. 1 battery: Turnigy nano-tech 1300mAh 4S 45~90C Lipo Pack.4 ESCs: Afro 20A Race Spec Mini ESC with BEC.The first unoptimized version of our quadcopter has: To better illustrate the process, we will use the Otus Quadcopter as an example, though this method is applicable to any flying UAV. Additionally, we will optimize a multi-rotor that is mostly hovering (our drone is neither a racing drone nor a competition drone).įurther reading: Drone Design Calculations and Assumptions First, let’s assume that the drone already flies, so you have an existing design from which you know the weight and the battery size. The optimization process is a loop, so we need to start by making some assumptions. Note: We will be using the Series 1585 thrust stand to gather motor and propeller data for this article. Calculate drone flight time (with calculator).Find the most efficient drone propeller. ![]() The concepts applied here can also be used to increase your drone's lift capacity. Many concepts presented here also apply to fixed-wings vehicles. The goal of this report is to demonstrate a simple process for extending your multicopter flight time. ![]() By Charles Blouin Video Tutorial - Improve Drone Flight Time
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