Re: [Paparazzi-devel] Multicopter new flight record 129min 37sec

[Sergey Krukowski]

Hi Michal!

The initial idea was to not using the GPS module to save extra couple of  
grams weight. For the second flight however I used a small GPS module from  
HK, but the receive wasn't good enough, so I didn't try to switch to hover  
mode. I'm currently preparing some new tests with autonomous flights, will  
keep informing.
Btw, here is the video of the second flight:
http://www.youtube.com/watch?v=vUbc73-x9sE

Best regards,
Sergey

> Hi Sergey,
>
> congratulations, that is a pretty long flight! I have a question - I
> noticed in your log that you were flying in manual mode (good job keeping
> fingers on sticks for over two hours) - have you tried also autonomous
> flight for such a long time? I am curious about the performance of  
> kroozSD.
>
> Regards
> M
>
> On Sun, Nov 2, 2014 at 9:18 AM, Sergey Krukowski <address@hidden> wrote:
>
> > Well, that's pity... I read that LiIons aint give their capacity if load
> > is close to 2C. But in my setup the average current is about 10A, so  
> > for 7P
> > cells it's significantly less than even 0.5C load. That is where my
> > suspicion about inaccurate current measurements came from. But  
> > according my
> > earlier investigations with precise amperemeter my current data should  
> > be
> > pretty good.
> > So, probably the cells are really not good enough.
> >
> > Best regards,
> > Sergey
> >
> >
> >  Hi Sergey.
> > > Now that is along flight time for a rotorcraft!
> > > I don't think that your sensor is wrong, i have yet to find a battery  
> > > that
> > > delivers its
> > > stated capacity.
> > > Every cell i have tried usually fall short of its advertised capacity  
> > > by
> > > 10%
> > > Chris
> > >
> > > On Sun, Nov 2, 2014 at 5:39 PM, Sergey Krukowski <address@hidden>  
> > > wrote:
> > >
> > >  Hi guys!
> > > > Well, I finally done the new flight time record with my octo frame  
> > > > under
> > > > normal outdoor conditions.
> > > > The result is 129min 37sec. Well, it's not really way too longer, than
> > > > Ferdinands record, but the flight conditions wasn't very good today.
> > > > Partially was pretty windy.
> > > > The wind once even dropped my timer down from the logging installation
> > > > box.
> > > > Looks like the NCR18650B cells in my battery are a bit old. Not sure  
> > > > if
> > > > my
> > > > current sensor is 100% precise, but despite of the theoretical  
> > > > capacity
> > > > of
> > > > 23800mAh, or, according the seller:
> > > > https://www.akkuteile.de/lithium-ionen-akkus/18650/
> > > > panasonic/panasonic-ncr18650b-3-6v-3400mah/a-100639/
> > > > the minimum capacity 3250mAh x 7 = 22750mAh, it gave me only 20230mAh.
> > > >
> > > > The attached logs are in rar file.
> > > > I'll upload the flight video on my youtube soon.
> > > >
> > > > Best regards,
> > > > Sergey
> > > > _______________________________________________
> > > > Paparazzi-devel mailing list
> > > > address@hidden
> > > > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
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