Ducted fan aircraft

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by jthunt, Mar 17, 2012.

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  1. Apr 22, 2016 #901

    henryk

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  2. Apr 25, 2016 #902

    Battler Britton

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    Great videos of a neat airpane!


    The UL-39 Albi, the "jet" ultralight motorized Version

    Published April 24, 2016 by Editor 0 Comments

    Albi
    A replica of L-39 Albatros carbon fiber, powered by a BMW engine driving a "fan" is the microlight market ...

    Presented in Friedrichshafen on the stand of the Czech manufacturer Skyleader - known for his series of two-seater microlight Skyleader 100 to 600 and its subsidiary JIHLAVAN Airplanes which took over the facilities of the former manufacturer Kappa in 2005 - UL-39 is Albi taking a tandem scaled silhouette of military training aircraft L-39 Albatros, used among others by private and civil patrols. The prototype made its first flight on April 4, at the hands of Radim Sterba.

    The design is due to Professor Robert Theiner (Ustav Letadlové techniky), with a university project conducted over nearly 17 years. JIHLAVAN always had ties, especially when developing ULM / LSA Skyleader with aerospace Institute dependent Brno University of Technology, but also with the Technical University of Prague.

    The UL-39 is made of carbon fibers, JIHLAVAN spot of technical resources in the field of composite materials, especially realizing the doors of the Airbus A320 and subcontracting for various certified aircraft manufacturers. The UL-39 two-seater, boasting a returning train is powered by a BMW driving a "fan" with 13 blades, with a diet of over 10,000 rev / min cruise. The designation (UL) indicates that the manufacturer is the microlight market to the European with a maximum weight of 472.5 kg at takeoff. ♦♦♦

    Image and video via AirZone.TV
    and www.flying-revue.czGoogle


    https://www.youtube.com/watch?v=g64Jdg9paoM

    https://www.youtube.com/watch?v=Lct_kxY8R_I#t=152
     
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  3. Apr 28, 2016 #903

    Malish

    Malish

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    Here is the photos of flight of PJ-II at Sun-n-Fun 2016 DSC_0403.JPG 55853_1460389895 (Large).jpg zpIMG_0033 (Large).jpg zpIMG_0039 (Large).jpg zpIMG_0046 (Large).jpg zpIMG_0050.JPG tmp_19215-aIMG_8919-1305321457.JPG zpIMG_0151 (Large).jpg
     
  4. Apr 28, 2016 #904

    henryk

    henryk

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    -have anyone video with Dreamer fly at Sun&Fan ?
     
  5. May 1, 2016 #905

    Malish

    Malish

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    Someone said they have video. As soon I get it, it's will be published.
    For now more photo's from Sun-n-Fun: DSC_0291_zpswgaksgib.jpg DSC_0419_zpspbmfnxtm.jpg DSC_0413_zps2e1hkqxv.jpg DSC_0414_zps43s1oob7.jpg DSC_0283_zpscspb0wkk.jpg DSC_0267_zpsdclkfh9r.jpg DSC_0272_zpsykieli8p.jpg
     
  6. May 1, 2016 #906

    henryk

    henryk

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  7. May 2, 2016 #907

    Bart

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    Malish, how does the performance and fuel consumption of this design compare with using the same engine with a conventional propeller?
     
  8. May 8, 2016 #908

    Solly

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    Bart,
    Where exactly would you stick a propeller on an aircraft that looks like this. The idea here is to have plane that looks like a fighter but does not need a government budget to fly. The efficiency of a prop plane against a fan is not the issue here.
    Just putting things into the right perspective.
    Malish, you did a great thing for the benefits of Experimental Aircraft fans all over the word. CONGRATULATIONS
     
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  9. May 9, 2016 #909

    Bart

    Bart

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    You're missing the point of my question entirely.

    Surely Malish and others have run some basic numbers on thrust of such a ducted fan configuration with a given amount of horsepower, vs. using the same horsepower to turn a propeller.

    Granted, there are pros and cons of either configuration, and a lot of variables, but I'm wondering if you have X horsepower from the engine, what's the comparative thrust if used to drive ducted fan(s) vs. turning a prop, all else equal?

    And, is it better to put the torque of the engine into one larger duct, or two smaller ones as seen in this plane vs. the Czech plane?

    Could be, Malish's application of engine torque to two fans is more efficient use of power than either the one duct of the Czech plane, or even perhaps than if applying to torque to a propeller.
     
  10. May 20, 2016 #910

    Malish

    Malish

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    No way to compare it. Ducted fan is different propulsion system. I our case it's makes aircraft look and fly like a jet. 12923102_1027307307344053_1326368101787645631_n.jpg 12932612_1027307394010711_3924988519880263686_n.jpg 12986918_1027307367344047_8901412881117737357_n.jpg tmp_19215-aIMG_87941413477843.JPG tmp_19215-aIMG_8932842365195.JPG
     
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  11. May 20, 2016 #911

    Sockmonkey

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    Side bonus of extra safety on the ground by preventing prop strikes against bystanders and debris.
     
  12. May 20, 2016 #912

    Doggzilla

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    So how did you like the weather back in America? :grin:
     
  13. May 20, 2016 #913

    bmcj

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    I think Malish already knew what to expect. He lived in Atlanta in the 80's.
     
  14. May 21, 2016 #914

    mcrae0104

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    Might prevent a prop strike on the runway but how is debris prevented from entering the prop disc?
     
  15. May 21, 2016 #915

    Malish

    Malish

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    This airplane for hard surface runways only. It's like a jet aircraft can "swallow" any debris from the ground. We always avoid to taxi or takeoff from dirty runways.
     
  16. May 21, 2016 #916

    henryk

    henryk

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    -for example=

    https://www.youtube.com/watch?v=dgG6X5yvHPQ
     
  17. Jun 4, 2016 #917

    John.Roo

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    Hello dear friends,
    unfortunatelly seems that Albi had a problem during test flight...
    Albi.jpg
    UL accident in LKCS
    So far is text only in Czech langauage, but incl. video and photos.
    I will try to find more details.
    Martin
     
  18. Jun 4, 2016 #918

    Doggzilla

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    Mi no Gusta.
     
  19. Jun 4, 2016 #919

    DangerZone

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    Could it be they were testing the parachute system to determine aircraft safety during canopy deployment..?

    Although, the nose down position does not look good for a parachute safety system design. There are better ways to save an aircraft with a foil canopy.
     
  20. Jun 4, 2016 #920

    Blue Chips

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    Not likely, at that angle not going to be a happy ending.
     

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