How far are we from the perfect electric "homebuilt" ?

Discussion in 'Hangar Flying' started by Speedboat100, Aug 20, 2019.

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  1. Sep 21, 2019 #381

    Speedboat100

    Speedboat100

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    I doubt that is very cheap.
     
  2. Sep 21, 2019 #382

    stanislavz

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    It was sarkastic quote. Fes for mini lak adds 20000 eu to price..
     
  3. Sep 23, 2019 #383

    rv7charlie

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    Speedboat100 said:
    Comes very naturally when you have so many engines in e-planes...among other aspects.

    I just love lifting fuselage conceps.

    IIRC, Barnaby Wainfan (Facetmobile), in a paper describing a NASA PAV candidate a/c, talked about the higher structural efficiency due to the thicker cross section saving so much weight that airframe size (wing area) can shrink saving even more weight, so that ultimately, it can offset much of the drag penalty. He posts here from time to time; maybe he'll comment.

    Charlie
     
    Last edited: Sep 23, 2019
  4. Sep 23, 2019 #384

    Speedboat100

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    I would love that...weight savnig by putting the "useless" ( when considering most caeses for aerodynamical benefits ) fuselage into work was also the aim of De Monge...whose design was the Bugatti 100P.
     
    Last edited: Sep 23, 2019
  5. Sep 23, 2019 #385

    stanislavz

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    Like this one ?

    [​IMG]

    Quite low on wing loading, but fast for it too.

    Plus google for : Kharkiv KhAI-3
     
    Last edited: Sep 23, 2019
  6. Sep 23, 2019 #386

    Speedboat100

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  7. Sep 23, 2019 #387

    Speedboat100

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    Last edited: Sep 24, 2019
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  8. Sep 23, 2019 #388

    stanislavz

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  9. Sep 23, 2019 #389

    blane.c

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    I still think some people have to compromise and make a hybrid to move forward in this area. As battery energy density improves you can rely less on the fossil fuel powered generator and eventually (hopefully) replace it entirely.
     
  10. Sep 23, 2019 #390

    Speedboat100

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    Solar battery plane is a hybrid too.

    ----

    Khai-3 looks sorta unmature.
     

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  11. Sep 23, 2019 #391

    Aerowerx

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    Well, it was built in 1936!
     
  12. Sep 23, 2019 #392

    stanislavz

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    It all depends. For me it is quitness and reliability. Both much better than two stroke..

    But for cross country, one small and detuned 4 stroke with magical 3kw of power is why not... But it needs an efficient airframe.

    Addition. Was not able to find 4 stroke with pressure lubrication at mini size. Was looking into industrial one only. China 125cc scoter is no no for..

    And i am.back into flying wing. Now considering Jim Marske Monarch. Maybe it looks weird, ant as sexy as swift to me, but forward swept wing is a thing. And no single word of bad handling.

    Kevlar/carbon version if ok even for 115 kg with battery. 63kg empy, 6g for 90kg pilot...

    And 1 to 19 glide ratio with open pilot.
     
    Last edited: Sep 24, 2019
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  13. Sep 24, 2019 #393

    Speedboat100

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    Ok...I tought it was paperware.
     

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  14. Sep 24, 2019 #394

    Speedboat100

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  15. Sep 24, 2019 #395

    stanislavz

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    Last edited: Sep 24, 2019
  16. Sep 24, 2019 #396

    henryk

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    =motor weight ?

    (similar german motor HPD13 weight is,iff I remember, 4.5 kg ?)
     
  17. Sep 24, 2019 #397

    Speedboat100

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    Funny , but I just worked 2 hrs tuning my hub motor.

    12 KW is amazing.
     
  18. Sep 24, 2019 #398

    blane.c

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    It would take on the order of 20hp to turn a 12kw generator? Sounds like the right size?
     
  19. Sep 24, 2019 #399

    Hephaestus

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    Do yourself a favor and google microturbine range extender.
     
  20. Sep 24, 2019 #400

    stanislavz

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    Give an example. I do not know, any efficient turbine in less than 100ke range
     

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