On 2014年12月24日 周三 at 17:04 Sergey Krukowski <
address@hidden> wrote:
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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