Hello everybody, we are experimenting a weird problem about consumptions in our vehicle. We are taking off a quadcopter (U10 plus 80kv motor and 30 - 10.5" blades - ESC Flame 100 14S); although we are able to take off and land without problems, our batteries (two 6S batteries connected in series of 10000 mAh each one) die very fast, only a few minutes of flying in vtol. We are losing energy very fast but we did not detect any overheat at the wires or any other device. Does anyone a tip about which coould be our problem? maybe any parameter should be tune ?
Our calculus say it should able to lift without problems, the weight is 16kg, and the lift of the motors up to 40 kg (aprox).
Im open to any suggest or hint
Thanks
Tuning might help but doesn’t increase your flight time drastically (if you have a reasonable flight before). Did you monitor the vehicle’s power consumption? Perhaps some logs?
You have 12S 10Ah. U10’s have 10kg per motor at max thrust give it or take. For weight per motor is 4kg, so (I did not find the exact motor type, just assuming), just for lift off, each motor needs %50 thrust, which is 8amps for each motor, 32 amps for the vehicle. Approximately your max flight time is 10/32*60 = 18.75 minutes at most. By saying “few minutes”, how much?
Hi and thanks for replying! The specs of our motors (assuming 75% eff) are 11.8 A per motor, so 47.2A of consumptions.
The C-rate is 30C for the batteries. Extrapolating to your calculus, we should have 10/47.2*60=12.71 min , we had calculated for 18 min aprox. Anyway, we flew for 5 min, which is weird.
We have to check Qgroundcontrol+Ardupilot analysis log yet.
Why don’t you just plug those numbers into eCalc? If you did you would find it’s underpowered/overweight (~69% throttle at Hover) and should fly (hover) for ~9 minutes to 85% capacity.
Post a link to a .bin flight log and let’s see how close this prediction is.
Hi! I posted here because we are using Arducopter 4.1.3, and for the current problems, I thought this was the most similar topic . Still we dont move to fixed wing mode