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Old Jul 02, 2012, 09:41 PM
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United States, NY, Huntington Station
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Question
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:


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.
ESC: warm.
Batteries: slight warm
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Last edited by chuenwe; Jul 02, 2012 at 09:54 PM.
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Old Jul 02, 2012, 09:51 PM
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United States, MI, Jenison
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Quote:
Originally Posted by chuenwe View Post
What can I do to increase the flight time
Fly more often
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Old Jul 02, 2012, 09:55 PM
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Have you been using http://www.ecalc.ch/xcoptercalc_e.htm?ecalc to help benchmark your setups?
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Old Jul 02, 2012, 09:56 PM
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Yea, the ecalc told me I could not even take off at 3.3Kg. And it apparently was wrong.
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Old Jul 02, 2012, 10:05 PM
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Originally Posted by chuenwe View Post
Yea, the ecalc told me I could not even take off at 3.3Kg. And it apparently was wrong.
What C rating are your Lipos
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Old Jul 02, 2012, 10:07 PM
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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.
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Old Jul 02, 2012, 11:13 PM
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United States, SD, Rapid City
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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?
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Old Jul 02, 2012, 11:15 PM
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I'm only using 10x4.5 thou with my 3s.
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Old Jul 02, 2012, 11:28 PM
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yeah that's too much load on those motors cause it getting hot even with 10x4.5 when its meant for 12x4.5 on 3s
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Old Jul 02, 2012, 11:32 PM
James not bond
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use better motor.. and lower the current load...
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Old Jul 02, 2012, 11:33 PM
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Originally Posted by sirbow2 View Post
yeah that's too much load on those motors cause it getting hot even with 10x4.5 when its meant for 12x4.5 on 3s

I'll try some 12x4.5 then. Thx.
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Old Jul 02, 2012, 11:34 PM
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Quote:
Originally Posted by jy0933 View Post
use better motor.. and lower the current load...
What would you recommend?

My current motor seems pretty good:

Power out put from ESC, 3S LiPo, 12x45 Propeller

25% 50% 75% 100%
Amp
Wattage
Thrust 1.5 A
17.5W
230gr 6.1 A
70W
650gr 14.2 A
160W
1290gr 20A A
210W
1380gr
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Old Jul 02, 2012, 11:36 PM
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Originally Posted by chuenwe View Post
I'll try some 12x4.5 then. Thx.
what i meant is that you have so much weight that it is even making the motors hot on 10x4.5, it will be worse on 12in props.

Quote:
My current motor seems pretty good:
not for this weight
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Last edited by sirbow2; Jul 02, 2012 at 11:44 PM.
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Old Jul 02, 2012, 11:40 PM
James not bond
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United States, MN, Minneapolis
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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
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Old Jul 02, 2012, 11:41 PM
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Quote:
Originally Posted by sirbow2 View Post
what i meant is that you have so much weight that it is even making the motors hot on 10x4.5, it will be worse on 12in props.
So what would you recommend?

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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