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

[Sergey Krukowski]

Recently made a test payload flight. Used a 1,6 kilo brick as a payload.  
Approximate max flight time a bit more than an hour.
https://www.youtube.com/watch?v=OrPo1fjULk0

Next year will make some long range tests in NAV mode.

Merry Christmas, guys!

> It can definitely be true, respecting the overall propeller circle area.  
> I will definitely test it as well.
>
> Best regards,
> Sergey
>
> > Hi Sergey,
> >
> > Maybe you could gain some flight time by flying at slow speeds in nav  
> > mode.
> > The power required to fly at low speed is sometime lower than in hover.
> > Just my two cents...
> >
> > Regards
> > Loïc
> >
> > 2014-11-19 9:42 GMT+01:00 Sergey Krukowski <address@hidden>:
> >
> > > 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
> > > > > > > _______________________________________________
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> > > > > > >
> > > > > > >
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