# Tag Info

2

A few things going on here. First of all -- voltage != efficiency (at least not necessarily). Efficiency is really a measure of total power output which is $I \cdot V$ (where I is current). Next, your 12V battery isn't 12V, it's got an operating range (from your link) of 12.6 to 8.4V, and I assume a typical voltage somewhere in the 11s. That means that based ...

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30 minutes is half an hour. 323.344 Watts is approximately 324 Watts. If you want 324 Watts for half an hour, then you want a (324 * 0.5) Watt-hour battery. This assumes, though, that your battery will go from 100% charge to 0% charge after exactly 30 minutes. Discharging a battery down to a state of charge of 0% can physically damage batteries, ...

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Your calculations assume that the motor will be running at full power all the time. Assuming your quadcopter's weight is less than 4 times the max motor thrust (which it needs to be to have any control), then you won't be running at full power.

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You have two motors that draw 300mA without load at 6V and you have one battery that is rated at 8.4V, 170mAh Combined, you have two motors that draw a combined (2 * 0.3 * 6) = 3.6 Watts unloaded. Compare that with your battery, that has a capacity of (8.4 * 0.17) = 1.428 Watt-hours. That is, you can run your motors unloaded for (1.428/3.6) = 0.4 ...

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If you want to learn about batteries and their characteristics, you should probably go to the BatteryUniversity to learn a few things before you start to do calculations, because if you miss interpret stated parameters as facts, you will get wrong results. https://batteryuniversity.com/learn/ The specific mAh you can get from a battery depends on the ...

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Increasing the number of blades in the props increases the amount of thrust generated but at the cost of efficiency i.e. more current will be drawn as we increase the number of blades. This is due to addition of weight and also because of increased drag, as each blade will have to cut through the turbulent air from more preceding blades which will result ...

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Motor and blades must be selected on the basis of amount of thrust required. Estimation of thrust of a motor depends on battery voltage, prop size and motor choice. Changing one of these will change the amount of thrust generated. Motors must be purchased from the manufacturers providing thrust tables that shows how many grams of thrust will be generated ...

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