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

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

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  1. Aug 23, 2019 #101

    Dan Thomas

    Dan Thomas

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    Yup. I knew that. Only halfway thru the first cup of coffee...
     
  2. Aug 23, 2019 #102

    Dan Thomas

    Dan Thomas

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    Except that 100 small propellers will be condiderably less efficient than one large prop.
     
  3. Aug 24, 2019 #103

    Aerowerx

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    Yes, but others may not.
     
  4. Aug 24, 2019 #104

    Aerowerx

    Aerowerx

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    Doesn't anyone read Asimov any more?:(
     
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  5. Aug 24, 2019 #105

    stanislavz

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    Why ? Ok, lets say one and fourth ?

    An example of better airframe for electrification compared to lazair

    SPECIFICATIONS:

    Wing Span: 35.4ft:

    Length: 19.68 ft.

    Wing Area: 105.5 ft.2

    Empty Weight: 250 lbs.

    Max Flight Weight: 470 lbs.

    Useful Weight: 220 lbs.

    Propeller (wood): 51.2" x 22.8"

    Engine Hp Direct Drive: 24. Hp at 3200 rpm

    Engine weight complete with prop = 86 lbs.

    Operating G-loads +4, -2

    Stall speed: 25 mph

    Max-VNE: 78 mph

    Glide Ratio: 16:1

    Climb: 5 5 0 ft./min.

    Take off distance (grass): 150 ft.

    Landing Distance 180 ft.

    Sink Rate: 3 1 2 ft/sec. at 40 mph

    Note: Performance figures are with a 165 lb. pilot, at sea level, at standard conditions, and with the 24hp motor.

    Please pay attention to glide ratio, and ic engine weight and rpm... And best climb speed

    This one should cruise with 3kw of power. And 85 lbs + fuel - will allow to put 1.5 tesla battery modules. 7kwh of useful energy

    The question is - go with one two or three propellers.
     
    Last edited: Aug 24, 2019
  6. Aug 24, 2019 #106

    litespeed

    litespeed

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    What is this actual airframe you are looking at?

    Is that the Lazair?
     
  7. Aug 24, 2019 #107

    litespeed

    litespeed

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    Here is a old glider that was converted to electric power years ago by the team that made the system for the Luciole MC30 electric. Also did the power system for the record breaking MC15 Cri Cri electric.



    Note the power package is quoted including battery @ 76 pounds.

    The aircraft features a 5.5-kilowatt-hour lithium-polymer battery pack with management system and controller that produces 26 hp and weighs 75 pounds. The motor turns a 47-inch, two-blade E-PROPS propeller. An alternative feathering propeller is currently under development.


    Initial test data shows that the ElectroLight2 can fly for one hour, 45 minutes at 65 knots or produce a maximum altitude gain of 9,842 feet at a maximum weight of 694 pounds.

    Naturally it is still quite a slippery machine for old school.
    http://www.lightaircraftassociation.co.uk/2012/News/electravia.html
     
    Last edited: Aug 24, 2019
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  8. Aug 24, 2019 #108

    litespeed

    litespeed

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    General specs for the glider, not with engine.

    Type A60 Fauconnet Immatriculation F-CDLC
    Developpment Egon Scheibe (D) Company of fabrication Avialsa (F)
    First flight of the type 1960 Number ever built 177
    year of fabrication 1970 Nr. 125 Number of seats 1
    Wingspan 15 m Length 6.25 m
    weight (empty) 152 kg Wing area 11.7 m2
    Wing profile
    Mu 14 Aspect ratio 19
    fuselage construction tube and fabric Construction material wood and fabric
    Maximum speed 193 km/h
    Best glide ratio 29 @ 85 km/h Minimum sinking speed 0.65 m/s @ 62 km/h
    First owner Club Bordeaux
    Today´s owner Peter Urscheler Home airfield Challes (LFLE)
    Last revision 2001 Hours / Flights 3053
     
  9. Aug 24, 2019 #109

    Speedboat100

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    That would not classify as a Part 103 aeroplane.

    Flynano is under 70 kg aeroplane that can take off from water with electric engine..has no endurance.

    This is less than half the weight of the A60 Fauconnet : https://www.inverse.com/article/50695-archaeopteryx-lightest-glider-in-the-world
     
    Last edited: Aug 24, 2019
  10. Aug 24, 2019 #110

    stanislavz

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  11. Aug 24, 2019 #111

    litespeed

    litespeed

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    For the Straton, I would do a aerofoil shaped pylon and make it as clean as possible.

    That current setup seems extremely draggy and heavy, esp the engine.

    But would be a good start for electric at that cheap price.

    It probably would be best having the battery in the fuse below the current tank.
     
  12. Aug 24, 2019 #112

    litespeed

    litespeed

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    So what? Who said it must be part 103?

    The flynano is irrelevant to this discussion and the Archaeopteryx is the most fragile design at the highest cost per pound of aircraft, with a very small ability to take weight for batteries.

    It makes the Lazair seem like a cross country machine.
     
  13. Aug 24, 2019 #113

    stanislavz

    stanislavz

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    Nice figures, it is based on old squale glider as i think...

    But i do hate to put all load in one fuselage at one point of a wing..
     
  14. Aug 24, 2019 #114

    Speedboat100

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    Well I agree...motorize this: https://en.wikipedia.org/wiki/Glidersport_LightHawk
     
  15. Aug 24, 2019 #115

    henryk

    henryk

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    -I think, SWIFT like tailless glider is moore optimal...

    f.e. BKB1-A in new,composites technology=

    http://www.reaa.ru/yabbfiles/Attachments/_bogdan_laminat_005_005.jpg

    +Conter Rotating propellers (moore specific thrust).
    https://kasperwing.com/kasperwing-poland/

    or=

    http://www.reaa.ru/yabbfiles/Attachments/impact_als_motorsegler.JPG

    (rigid wing + trike).
     
  16. Aug 24, 2019 #116

    Dan Thomas

    Dan Thomas

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    How does any of that address the efficiency differential between 100 1-hp props and one 100-hp prop?
     
  17. Aug 24, 2019 #117

    stanislavz

    stanislavz

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    Ok. It was more about possibility to scale motor and not loosing efficiency.
     
  18. Aug 25, 2019 #118

    Speedboat100

    Speedboat100

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    Anyone have a good idea where to get funding for experimental electric aircraft developement ?
     
  19. Aug 25, 2019 #119

    Tiger Tim

    Tiger Tim

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    Make a website, post pretty pictures and vaguely engineering-looking screenshots, make big promises, accept deposits.
     
  20. Aug 25, 2019 #120

    Speedboat100

    Speedboat100

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    Can you recommend a web platform for it ?
     

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