|Jul 02, 2012, 09:41 PM|
How to increase flight time?
I built a Talon Hexa and it went through a few revisions. The build thread is here.
I did a few test using different batteries but seems to be hitting the copter/motor's limit. What can I do to increase the flight time with minimal changes? I'm thinking I could try a set of higher power motor, but I'm hopping to see if anyone have any experience in this aspect.
Here are some detail/spec:
Flight Controller: DJI NAZA
Motors: AC2836-358, 880Kv
Props: GemFan 10x4.5
ESC: 6 x Turnigy dlux 30A (2s~6s)
BEC: Castle Creations' CC BEC
Here are some flight time numbers:
Take Off Weight: 2.4Kg
Batteries: 2x 2250mAh
Flight Time: 7 minutes
Weight: 3.02Kg (carrying a FPV camera)
Batteries: 2x 5000mAh
Flight Time: 14 minutes (but the battery was completely exhausted. The battery warning was set too long)
Weight: 3.48Kg (carrying a FPV camera)
Flight Time:15 minutes (this time I have the Battery Warning set at 11.2V)
Actual Power used: 12403mA (measured from the battery charger)
Batteries: 2x 8400mAH
Motors were hot, but it's not hot enough that I can't hold on to it.
ESC was warm
Weight: 4.202Kg (carrying a Canon T2i that I would not normally use)
Flight Time: 5m 42 seconds
Actual Power used: 5619mA (measured from the battery charger)
Batteries: 2x 5000mAh
LiPo voltage after landed: 11.4V
Motors: Hot. I could hold it for 3 seconds and I had to let it go.
Batteries: slight warm
|Jul 02, 2012, 10:05 PM|
|Jul 02, 2012, 10:07 PM|
The 5000mAh ones are the Zippy 40C and the 8400mAh ones are the Turnagy nanotech 40C. I run them in pair in parallel, so essentially, they are 80C.
|Jul 02, 2012, 11:13 PM|
put a 4s lipo on there with some 11x4.5 props(since 3s uses 12x4.5).
20A motors for that much weight isn very big; get some bigger motors. 30Amp draw maybe?
|Jul 02, 2012, 11:33 PM|
|Jul 02, 2012, 11:34 PM|
My current motor seems pretty good:
Power out put from ESC, 3S LiPo, 12x45 Propeller
25% 50% 75% 100%
Thrust 1.5 A
230gr 6.1 A
650gr 14.2 A
1290gr 20A A
|Jul 02, 2012, 11:36 PM|
|Jul 02, 2012, 11:40 PM|
honestly... sell the 3s... use 4s(even 5s if you get high grade motor) pack
pretty simple physics.... V*I=P.... at same power... higher volt >> lower current....>>> lower current>>> longer flight time (count resistance which goes motor/esc heating up..) the final time will be about.. 5~10% less... theoretically
|Jul 02, 2012, 11:41 PM|
But anyway, the 4KG test was just to see how much weight it COULD carry. I've never planned to carry a hefty 1.1Kg Canon T2i. So the actual flight weight is much lighter. I just want longer flight time.
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