Re: [Paparazzi-devel] voltage drop on full throttle

[Refik Sever]

Thank you very much for your reply Gerard,

The lipo is softer than before. It seems that the voltage drop is due to lipos, 
rather than cables.

I do not now the voltage drop before crash, because we were flying using RC 
only and we did not get telemetry.

Cheers,
Refik


>Message: 3
>Date: Wed, 3 Jul 2013 21:27:18 -0300
>From: Gerard Toonstra <address@hidden>
>To: address@hidden
>Subject: Re: [Paparazzi-devel] voltage drop on full throttle
>Message-ID:
>        <address@hidden>
>Content-Type: text/plain; charset="utf-8"
>
>It depends if you saw the same some time ago. Lipo's have some internal
>resistance which increases over time, resulting in a voltage drop.
>If you feel that the lipo starts to feel a little bit "soft" (puffy)
>instead of a hard casing, it's an indication its quality reduced more and
>one or more cells are close to dying.
>On one 4s I have, one cell is bad and the voltage drop is 1.5V on a simple
>quadrotor.
>
>The voltage drop may cause failsafes or a plain voltage failure in the air.
>
>Another thing is that the classification of some lipo's in terms of current
>it can deliver is optimistic. There are lipo's where they don't make it
>clear
>that the number means "burst" current vs. continuous current and even then
>sometimes need to be divided by half.
>
>
>Filte test did a lipo test some time ago:
>
>https://www.youtube.com/watch?v=KvIaLN4AVlE
>
>Rgds,
>
>G>


On Wed, Jul 3, 2013 at 7:56 PM, Refik Sever <address@hidden>wrote:

>  Hello,
>
> After several months of hard work, today we  performed our first flight
> with paparazzi using manual mode. We also tried auto1 and auto2, for short
> periods. It was not too bad. It couldn't circle using auto2. Tomorrow we
> will try to tune the aircraft and play with the control gains.
>
> There is one problem. When we give full throttle, the voltage drops by
> 0.8V. Is it a normal situation?
>
> We had a crash last month, and all the cables from battery to ESC were
> broken, and we re-soldered them. Is this voltage drop occur due to the
> resistance of the re-soldered cables?
>
> Cheers,
> Refik
>
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>
>
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