How do I calculate flight time on my new Icon A5?
I just bought a new Icon A5 PNP with 960kv motor, and I also have a fresh homebuilt quadcopter with four 1200kv motors. I am using 4x 30w plush ESC's for the Quad, and one 30w eFlite ESC in the plane.
I bought 2 Turnigy 2650mah 3c batteries, which I want to share between the two aircraft. What I am really struggling with is how to figure out the flight time with these batteries, for each of the 2 aircraft.
Can anyone help me with this question? I'm a newbie, but I'm completely hooked! Haven't had this much fun since my PT-19 flight trainer in 1972!!
It's impossible to say for sure unless you have a voltage meter or a charger that tells you how many amps it's putting into the battery.
My preferred method is to fly the plane for a few minutes, land and measure the voltage, then fly again for a few minutes, and repeat. Once the voltage drops to 3.75V per cell or less, I'm done. I have one of these ($2) in my field box.
As for me, I never fly more that about 60-70% of the battery capacity during a flight, to leave enough power for a go-around or similar. Or, in case you do much more acrobatics or something.
In your case, with a 2650 Mah battery pack, that's 2.65 Ampere Hours. And, 60% of that 2.6 Amp Hours is 1.56 Amp Hours.
So, next time you fly, fly for perhaps exactly 4 minutes, then charge that battery. If you put in 0.94 Ampere Hours, then you can fly 1.56 Ampere Hours, divided by 0.94 Amp Hours, times that 4 minutes. That comes out to 6.6 Minutes or 6 minutes, 36 seconds or so. It's nice that it takes about the same number of Amp Hours to recharge the battery as you took out of the battery on the previous flight.
Without a charger that has an LCD display that shows Ampere Hours, you are pretty much flying in the dark.
I'm with mclarkson on this. Measure the battery cell voltage after flying and adjust flight time until the individual cell voltage, measured a minute or two after removing the battery, is in the 3.7 - 3.75V range.
Get one of those cheap little voltage checkers and you can measure voltage easily in the field and so very quickly arrive at your optimal flight time.
one of these voltage alarms may help too.
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