What do you thing about "e-soaring"?

Discussion in 'Soaring' started by John.Roo, Dec 5, 2013.

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  1. Nov 10, 2019 #361

    henryk

    henryk

    henryk

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    -greate thanks !

    =butyfull aircraft,
    but lower AR=lower L/D=lower fly distance ...

    =how much ?

    BTW=the weight of central wings+extenders =?
     
  2. Nov 14, 2019 #362

    John.Roo

    John.Roo

    John.Roo

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    I fully agree Henryk - with lower AR you increase energy necessary for flight.
    But you don´t need always to fly long distance or long time. Sometimes is flight done just for fun :)

    Weight of one complete wing with 15 meters wing extension is approx. 40 kg (no battery of fuel inside).
     
    Last edited: Nov 14, 2019
  3. Nov 14, 2019 #363

    John.Roo

    John.Roo

    John.Roo

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    Natural hybrid airplane” – what it means?
    People are asking me if I really believe that electric propulsion is ecological. And they always start to speak about "dirty" sources of electric energy like coal power stations. I could start to explain about how to get green energy from renewable energy sources, but I prefer to say:
    “You are forgetting the idea of sport aviation. We are not always flying from point A to point B. We are flying because we love the freedom feeling in the air. And during this type of flying we need only a little bit of energy to get to strongest and cleanest energy source every glider pilots knows – thermals below of cumulus clouds”.

    “Hybrid” typically means that you have two energy sources aboard. U-15E Phoenix has aboard electric propulsion, and second energy source is nature. Of course you can easily fly “cruise flights” with short winglets like with typical sport plane. But when you install the long wing extensions and you reach your first thermal lift you will understand what “natural hybrid airplane” really means :)

    Conclusion - every TMG (even with combustion engine) is "hybrid airplane" helping to make our world cleaner :)
     
  4. Nov 14, 2019 #364

    henryk

    henryk

    henryk

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    "one complete wing with 15 meters wing extension is approx. 40 kg"= L + R = 80 ?
     
  5. Nov 14, 2019 #365

    henryk

    henryk

    henryk

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    =QUIKI A-8 ELECTRO ! (Youri Yakovlev...)

    BTW= "kWh" =electric energy, not caopacity or power !
     
  6. Dec 5, 2019 #366

    John.Roo

    John.Roo

    John.Roo

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    Electric flying in arctic conditions? No problem :)

     
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  7. Dec 5, 2019 #367

    BJC

    BJC

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    Nice.

    I'm curious: Is there a minimum battery temperature below which it is not recommended to fly?

    Thanks,


    BJC
     
  8. Dec 7, 2019 at 6:38 AM #368

    John.Roo

    John.Roo

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    Hello BJC!
    This is info I get from battery producer.

    Store and use cells at lower temperatures (5-15°C). As the temperature rises, the service life decreases. Cooling to -35°C does not impair the service life. However, the internal electrolyte freezes around −40°C.

    It means that operation of electric airplanes in winter conditions will request hangar, ideally heated (5-15°C). I can imagine situation when the airplane has to stay outside overnight - than woud be good to keep baterry at 40-80% and before first flight connect charger. During charging will battery temp increase and that will be better for battery capacity and lifetime.

    Best regards!
    Martin
     
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  9. Dec 7, 2019 at 10:04 AM #369

    BJC

    BJC

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    John.Roo

    Thanks,


    BJC
     
  10. Dec 8, 2019 at 7:55 PM #370

    emir_82

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    There is some papers saying that storing the packs at low temperatures extend the battery's calendar life.
    Of course you have to preheat the pack before using it.

    Regards
     

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