8/12/2023 0 Comments Quadcopter battery time calcIt combines this information with propulsion data and estimates your flight time for you.įor this article, we will borrow data from this propulsion system with a T-Motor MN4014 motor and an APC 12圆e propeller in order to demonstrate the relationship between payload and flight time.įigure 3: Drone Flight Time Calculator with sample data We have developed a drone flight time calculator that allows you to input your drone’s information, such as drone and battery weight, battery capacity, and the # of propellers. Since we will be drawing higher voltage (and therefore greater power) to reach a higher RPM, the battery life will deplete faster, and our flight time will be lower. The more power drawn, the shorter the life of the battery. If you have a capacity of 70 Wh, you can draw 70 watts of power for 1 hour or 1 watt of power for 70 hours. Learn more: watch this video to see how voltage affects motor speed.īattery capacity is often expressed in Watt-hours (Wh). To increase the RPM, we have to draw more electrical power from the battery, specifically more voltage. Since we are keeping our propellers constant, we will therefore have to increase the RPM. For a more accurate thrust, consider testing with a thrust stand. There are a few ways to calculate thrust, but it is generally dependent on several factors, including propeller diameter and pitch, air density, velocity, and rotation speed (RPM), as demonstrated by this equation for dynamic propeller thrust:īased on this equation, derived by Electric Aircraft Guy, there are a couple ways we can increase thrust: we can change the dimensions of the propeller, or we can increase the RPM. Ultimately, greater mass = greater thrust requirements.įurther reading: How Much Payload Can a Drone Carry When a drone is hovering, it is in equilibrium so the thrust is equal to the weight:įor most drones, you want their max thrust to be about twice as much as is required to hover, which allows them to take-off, climb, and operate smoothly. When you add mass to a UAV, you increase the amount of thrust required to lift it off the ground. It ultimately comes down to this: to overcome a higher weight, more thrust is required from the propellers, which requires higher RPM, which draws more power from the battery, thus decreasing the available battery life and flight time. Note that decreasing the airframe’s weight is a good option too and it has the same effect as reducing the payload’s mass. Most people assume this intuitively, but why is it true? For the purpose of this article, we are assuming that the payload is increased while the drone’s components stay the same. We can start with the assumption that adding payload decreases flight time. Figure 1: Agricultural drone carrying a payload Drone Payload Calculation
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