Ducted fan aircraft

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

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  1. Jun 11, 2019 #1361

    henryk

    henryk

    henryk

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    -yes,ducted fan is another type of propeller(generator of thrust force),but both are working on the equal phisical principes...

    -ducted fan inside of the fuselage have small diameter
    =low specific thrust (big specific power/thrust/surface !)

    conterrotating fans can help with this problem...

    see todays turbofans (conter rotating too).

    f.e.=
    https://www.dlr.de/bt/en/desktopdefault.aspx/tabid-8196/14020_read-35636/
     
  2. Jun 12, 2019 at 2:56 AM #1362

    Malish

    Malish

    Malish

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    Actually Ducted fan has 30% more static thrust than same diameter open prop with same HP engine.
     
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  3. Jun 12, 2019 at 7:56 AM #1363

    henryk

    henryk

    henryk

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    >30 %,
    but < 1kG thrust/HP ! (small inlet surface...)

    I think, with CR and differential gear fan we can get > 1 kG/HP ?
     
  4. Jun 12, 2019 at 9:31 AM #1364

    Malish

    Malish

    Malish

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    Yes, it is, but for what kind cost and complexity?
     
  5. Jun 12, 2019 at 3:41 PM #1365

    henryk

    henryk

    henryk

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    -cost and weight not big, for 100 HP <3 kg +second propeller(fan)

    https://kasperwing.com/kasperwing-poland/

    =auer CR Differential gear/reductor 3:1 needs high RPM engine (light and compact...)

    =it is siple,allmost symmetrical construction.

    iff involve DLC technology,NO oil lubrication!
     
  6. Jun 13, 2019 at 12:09 AM #1366

    henryk

    henryk

    henryk

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