Flight times
If you know the amp draw and the battery size what is the formula to get the expected flight times?
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RE: Flight times
ORIGINAL: andrewskj If you know the amp draw and the battery size what is the formula to get the expected flight times? run time in minutes = (Battery Capacity in Ah/Motor Current in A) x 60 This is just a rough guide, and it requires that you know approximately how much current your power system draws. A wattmeter will tell you. The formula also needs your battery capacity in Amp Hours (Ah). Divide mAh by 1000 to get Ah. The simplest method is to measure your current at full throttle and use that number in the formula. In reality, you probably won't fly at full throttle all the time, so your average current usage probably will be less than the full-throttle value. Also, a power system will often draw less current in flight than it does during ground testing. So if you use the full-throttle current in the formula, it will generally give you a worst case flight time. Actual flight time will usually be greater. I've included some examples below. - Jeff Here are some examples. Example 1: 1500 mAh battery power system draws 12A 1500 mAh = 1.5 Ah 1.5/12 x 60 = 7.5 minutes Example 2: 1500 mAh battery power system draws 18A 1500 mAh = 1.5 Ah 1.5/18 x 60 = 5 minutes Example 3: 4000 mAh battery power system draws 25A 4000 mAh = 4.0 Ah 4.0/25 x 60 = 9.6 minutes Example 4: 5000 mAh battery power system draws 25A 5000 mAh = 5.0 Ah 5.0/25 x 60 = 12 minutes |
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