how to find the minimum battery capacity C required for the drone to reach the landing point?

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xCrane

New Member
I calculated the height object height, Distance to the base of the object, Drone weight, maximum and minimum battery voltage, resistance force and power (P). The drone is flying in steady state, without acceleration and flying on a straight trajectory. I started looking for formulas on the Internet and came across this one: Umax=Umin−Qmax/C. Qmax is the maximum charge of the battery that it can give from a fully charged state to a fully discharged one. And the problem is that I can't find the formula for Qmax. The formulas I found were through the minimum battery capacity C. I may be an idiot, but I'm trying to fix it. P.S. - Sorry about my English
 
What then is your question? Are you trying to determine the time from launch to landing on a battery? One good way to figure that out would be to fully charge the battery and fly the drone close by until the power runs out. Time that period. You would have a ballpark feel. Remember however there are other factors that affect the flight time, such as wind direction and speed. Good luck sir!
 
xCrane said:
I calculated the height object height, Distance to the base of the object, Drone weight, maximum and minimum battery voltage, resistance force and power (P). The drone is flying in steady state, without acceleration and flying on a straight trajectory. I started looking for formulas on the Internet and came across this one: Umax=Umin−Qmax/C. Qmax is the maximum charge of the battery that it can give from a fully charged state to a fully discharged one. And the problem is that I can't find the formula for Qmax. The formulas I found were through the minimum battery capacity C. I may be an idiot, but I'm trying to fix it. P.S. - Sorry about my English
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eCalc.ch site is your friend here, can use it for free or pay for unlocking other products they have specs for or put in your own for running the calculations. As LoneRC said there are many factors even knowing the prop size and pitch the motors and ESCs and the battery capacity in mAh and the C-rating in general indicates the max discharge without significantly dropping voltage from the current load (amount of power it's trying to deliver to the motors)
 
Ultimately the best way to know is to test and in testing you should fly straight away the same distance straight back to nullify effects of wind (averages out if wind is behind you one way and face on the other way). The particular throttle control and efficiency of a flight will depend on how much the altitude changes even if you want that altitude change to be 0 across the flight it never will be the quad will dip and pick up altitude from thermals regular wind and other atmospheric conditions that vary and are out of your control. Best is to figure out what you need to make it work with physical testing and then get it 120% better so you have some overhead.
 
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