Ranger electrically powered?!?

Discussion in 'Electric Propulsion' started by erkki67, Jul 26, 2019.

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  1. Aug 23, 2019 #61

    pictsidhe

    pictsidhe

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    Only if you splash out on gallium arsenide cells. Trust me, you aren't going to do that. Cells that wont cost a house are around 20% efficient. You
     
  2. Aug 23, 2019 #62

    pictsidhe

    pictsidhe

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    With cells you can afford and 70% coverage, 1100W in blazing sunshine.
     
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  3. Aug 24, 2019 #63

    Hephaestus

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    Yeah but at FL20 they're much more efficient and cooled enough to produce better power.

    Sorry I had to derail the thread and make it super obnoxious and split more hairs. :D
     
  4. Aug 24, 2019 #64

    pictsidhe

    pictsidhe

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    Sigh, maybe 1200W. I'm sure that'll make it able to fly continuously. /sarcasm

    There's a depressing lack of realism on this forum lately.
     
    Last edited: Aug 24, 2019
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  5. Aug 24, 2019 #65

    Hephaestus

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    Lol I was poking fun at the next argument to come up :D
     
  6. Aug 24, 2019 #66

    Speedboat100

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    It would easily as the batteries are no longer holding it back...with their weight.

    You gotta pay more attention to details.
     
  7. Aug 24, 2019 #67

    Hephaestus

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  8. Aug 24, 2019 #68

    litespeed

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    Sure have some nice engines.

    However I am concerned they have very little structure to join it to a mount for the power and thrust.

    Esp the twin engine version with contra rotation .
     
  9. Aug 24, 2019 #69

    henryk

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  10. Aug 24, 2019 #70

    henryk

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    -see CR FLIGHT ...
     
  11. Aug 24, 2019 #71

    erkki67

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    So what can I expect from a 16kw engine and a 50lbs battery package on the Ranger and or Piojo?
     
  12. Aug 24, 2019 #72

    Dan Thomas

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    Lately?? Wishful thinking has been around here since I've been here.

    I miss Orion and his maxim: "What you believe or do not believe does not change the facts." Orion was an aeronautical engineer of wide and long experience. He had a lot to do with Boeing's airplanes, didn't he?
     
  13. Aug 24, 2019 #73

    pictsidhe

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    Taxi testing.
     
  14. Aug 24, 2019 #74

    pictsidhe

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    You gotta pay more attention in physics and maths classes.
     
  15. Aug 24, 2019 #75

    pictsidhe

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    The people who can do the physics and maths needed to just ballpark an idea seem to have mostly stopped posting on HBA. I can understand why.
     
  16. Aug 24, 2019 #76

    GeneG

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    50Kg @ 280Watt per Kg = 14Kwh (Nissan Leaf battery cells)
    100% power for 5 min = 1.6Kwh (Take off)
    12,400Kwh / 7kw (1/2 power) = 1 3/4 Hr cruise with no reserve
     
  17. Aug 24, 2019 #77

    BJC

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    I talked to the people displaying the ALPHA ELECTRO at Oshkosh. Not all the information was credible; they claimed the same endurance, one hour with reserves, in a sustained full power climb mode as reduced powered cruise as consecutive touch and go operations. One point they did make, though, that is often not discussed, was battery life. It can be a short as 300 cycles, and it’s capacity will be significantly diminished before 300.

    So, if an airplane is flown with the battery and power profile in the example above, what is the expected useful life of the battery?

    Thanks,


    BJC
     
  18. Aug 24, 2019 #78

    GeneG

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    I understand that the allowable discharge rate is 1.0, so discharging under 14 Kw would not damage of degrade the cells. As you can see, the proposed discharge rate does not exceed that max therefore not reducing their life.
    I have not sufficient information to determine what the cycle numbers would be.
    Discharging at the recommended rate would yield a life of about 10 years under normal use.
    Also, the charge rate will effect life expectancy.
     
    Last edited: Aug 24, 2019
  19. Aug 24, 2019 #79

    erkki67

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    1h with 45min of reserve on a Piojo or an Ranger, hey I like that idea.
     
  20. Aug 24, 2019 #80

    GeneG

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    It may work for you in Switzerland, but our ultralight rules make it virtually impossible.
    We could easily build viable LSA craft here, but the rules so far don't allow that either.
    Seems that the EAA is only interested in experimenting with 50 year old technology.
    I guess that moving to Australia would be the cure.
     

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