The state of the Art?

Discussion in 'Electric Propulsion' started by Foundationer, Mar 10, 2019.

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  1. Mar 10, 2019 #1

    Foundationer

    Foundationer

    Foundationer

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    Seeing as we have this shiny new forum to fill with rabid fan boy rantings I thought it might be an idea to start with some links to successful electric homebuilt airplanes. The more detail on motor/ESC/batteries the better!

    I'll start with Dale Kremer whose E-Lazair project in a lot of ways probably put the lightbulb over people's heads re. This being achievable.
    https://www.rcgroups.com/forums/showthread.php?1412424-100-scale-Electric-Lazair
     
  2. Mar 10, 2019 #2

    Foundationer

    Foundationer

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  3. Mar 10, 2019 #3

    Aerowerx

    Aerowerx

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    From what I can see he never got out of ground effect.
     
  4. Mar 10, 2019 #4

    Foundationer

    Foundationer

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    But he was flying in ground effect! Plus, given how that thing was built, I think it's for the best he didn't go any higher!
     
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  5. Mar 10, 2019 #5

    radfordc

    radfordc

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    You just need to see the right video clip. Look here starting at 6:00: https://youtu.be/x-9uLPIxrGE
     
  6. Mar 10, 2019 #6
  7. Mar 10, 2019 #7

    Tiger Tim

    Tiger Tim

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    Peter is a member here who usually posts in the Ultralight sub-forum. With his experience in electric I’d like to see him post here too though I imagine he’s pretty busy.
     
  8. Mar 17, 2019 #8

    John.Roo

    John.Roo

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    I have to edit WIKIPEDIA - Phoenix projects are not listed....
    Phoenix Air - developing airplanes with electric propulsion since 2010 :)
    Low e-pass.jpg

    First flight of Phoenix D-14 in 2011
    https://youtu.be/f-VjNI-2fJo
    LiFePO battery at the beginning, than Li-Po battery with capacity 5,5 kWh, later 7,8 kWh. Motor 33 kW air cooled outrunner.
    More about D-14 project - it is movie filmed for Czech Television (ENG subtitles done by myself so I apologize for lower translation quality)
    https://youtu.be/QlkDs9m43Zk
    I really enjoyed also legendary formation flight of 3 electric projects in Grenchen 2018.
    Grenchen 2017 ©Jean-Marie urlacher_000019.jpg

    e-Legends from 2011.jpg

    New elektra Phoenix U-15/17E test flown in 2018
    https://youtu.be/y6CU8cfcYN4
    Battery Li-Ion 35kWh, endurance 2,5 h + 30 min reserve. 60 kW watercooled outrunner motor.
    Weather is improving so next week we will continue with flight tests - I am really eager :)
    First e-flight 3.jpg

    let 1.jpg

    Best regards!
    Martin
     
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  9. Mar 22, 2019 #9

    John.Roo

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  10. Mar 22, 2019 #10

    Exian

    Exian

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    Dear Martin,
    What is the weight of your 35kWh Li-Ion Battery pack?
    Considering an energy density of 250Wh/kg I get a weight of 140kg!
     
  11. Mar 23, 2019 #11

    John.Roo

    John.Roo

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    Hello dear Arnaud!
    Your calculation is practically exact :)
    To keep same CG we replaced weight of fuel in fuel tanks (2x 40 kg of cells) and installation weight of Rotax in the front (1x 70 kg of cells). All together 150 kg.

    For comparizon - on first elektra I had at the beginning 34 kg battery (5.5 kWh) and after has ben done small upgrade to 50 kg (7.8 kWh).

    By the way...
    I found interesting photo of one beautifull one-seater on this page :)
    https://woelfle-engineering.com/

    Best regards!
    Martin
     

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