Battery/Flight time Testing - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-24-2016, 08:36 PM   #1
kidd
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Battery/Flight time Testing


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New Reptile 500 build, AUW = 1,421g (3.13lb) with a Turnigy 3600mAh 3S 30C Lipo, hovering about 60'up in the "GPS hold" spinning 1045 props at a bit less then 50% throttle, brought it down to land 11.25 minutes, battery tested at 3.75 volts. I am very Happy with this test and the time that was shown, will now be ordering a 5000mAh 4s lipo then try some different size props, in hopes of increasing this time.
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Old 07-24-2016, 09:39 PM   #2
Max
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Re: Battery/Flight time Testing

Excellent.

Bigger batteries mean more weight. Will be interesting to see what you get with the 5000's
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Old 07-24-2016, 10:01 PM   #3
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Re: Battery/Flight time Testing

Thanks Max, going to the 5K will add an additional 205g, but also going to try some bigger props
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Old 07-25-2016, 05:31 AM   #4
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Re: Battery/Flight time Testing

You actually want smaller props with higher voltage batteries to keep the power level the same.
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Old 03-29-2017, 10:03 PM   #5
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Re: Battery/Flight time Testing

Quote:
Originally Posted by Helno View Post
You actually want smaller props with higher voltage batteries to keep the power level the same.
I was of the thinking that:

power (watts) = voltage (volts) * current (amps)

so...

with a battery that has more cells (more voltage), then you don't need as much current to get the equivalent power output (watts).

Larger props I think would still require the same amount of power for equivalent performance, but at a lower RPM.

Or am I getting something wrong here?

I've tried to get longer flight times with all sorts of different configs on my big quad. Best I ever got was 11.5 minutes with a 5000mah 4s battery on 5008-370 motors spinning 15x5.5 carbon props. I gave up and bought a Mavik.
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Old 03-30-2017, 12:00 AM   #6
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Re: Battery/Flight time Testing

What can happen with more voltage is you end up with substantially more rpm at half throttle , for example , then more load on the motors with more current being used. To compensate you hAve to reduce pitch. From 3 to 4s even at the same current you are looking at almost a 25% increase weight. Then when you jump from 3600 mah to 5000 ma
another 36% or so increase . That could work out to a 61% increase in weight.
May I asked the purpose of increased flight time ?


Rather than invest a whole lot in larger heavier batteries , try a 4S at 3600 . Then try prop changes
With less pitch and different brands. Just a warning this could be an expensive experiment. Better to do little changes at a time to see just in what works best and what direction you going.

I believe the more thrust starts with longer props at less pitch since your hover motor speed is good at about half throttle. In the end , your all up weight is your enemy. Maybe also consider doing weight saving measures. Looking at different brands of batteries and their weights.

Just some considerations fir thought.

Last edited by stegl; 03-30-2017 at 12:14 AM.
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