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 #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 #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 #1364

    Malish

    Malish

    Malish

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    Yes, it is, but for what kind cost and complexity?
     
  5. Jun 12, 2019 #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 #1366

    henryk

    henryk

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  7. Jun 19, 2019 #1367

    Malish

    Malish

    Malish

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    We did move our airplane from large airport of Volgograd to a small field with grass runway about 3000' long. Russian aviation authorities didn't want us to fly our test flights in this large airport.
    But, what it's makes things better, if we could fly our aircraft from this small airfield with short grass runway, PJ-II "Dreamer" will be even more attractive for potential buyers. P6191908.JPG
    P6191909.JPG
    P6191911.JPG
    Изображение 002 (Large).JPG
    Изображение 001 (Large).JPG
     
  8. Jun 20, 2019 #1368

    henryk

    henryk

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    -concurenz not sleeping !

    BTW= very short TO/L distances, circa 100m ...
     
    Last edited: Jun 20, 2019
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  9. Jun 20, 2019 #1369

    Malish

    Malish

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    Today we finished assembly of our aircraft and did some high speed runs on grass runway. New landing gear and aircraft performed well.
    We did run it up to rotation speed(95 km/hr) and it was no problems to get this speed in 250 meters(750 feet).
    Also there was no problems with debris "sucking" into the airducts.
    Tomorrow morning we will do some test flights from this airfield. P6201913 (Large).JPG P6201916 (Large).JPG P6201917 (Large).JPG
     
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  10. Jun 20, 2019 #1370

    Malish

    Malish

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    And some video of today test's:

     
  11. Jun 20, 2019 #1371

    henryk

    henryk

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    =very hard (bad) conditions for first fly tests ...
     
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  12. Jun 20, 2019 #1372

    rv6ejguy

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    Are you still running the original engine and mechanical fuel injection or do you have the LS7 and EFI in there now?
     
  13. Jun 22, 2019 #1373

    Malish

    Malish

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    Yes, this aircraft still have LS6 engine on it. LS7 engine with your EFI system will go on second aircraft.
     
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  14. Jun 22, 2019 #1374

    henryk

    henryk

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    iff to install greater ("grass") tires ?
    (temorary,for this airfield...)
     
  15. Jun 22, 2019 #1375

    Malish

    Malish

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    Are you cresy?
     
  16. Jun 23, 2019 #1376

    henryk

    henryk

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  17. Jul 27, 2019 #1377

    Malish

    Malish

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    Now our airplane is in paint shop, getting ready for MAKS airshow.
    This is how it's will look when all is done.

    P7221929 (Large).JPG

    thumbnail.jpg
     
  18. Jul 27, 2019 #1378

    Blackhawk

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    Excellent paint scheme; looking forward to seeing it finished.
     
  19. Jul 27, 2019 #1379

    Doggzilla

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    You read my mind Malish.

    She looks great in those colors!
     
  20. Jul 28, 2019 #1380

    Doggzilla

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    Hey Malish, what are you getting for your static thrust?

    I was checking out the Martin Jetpack after they recently went out of business and was surprised to see their ducted fans produced the same thrust as a prop for the same HP. Over 700lbs with 200hp, the same as a 200hp Cessna with prop.

    The patents are all almost 30 years old, so most of the patents are expired. You may find them useful, depending on your power to thrust ratio.
     

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