Ducted fan aircraft

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

Help Support HomeBuiltAirplanes Forum by donating:

  1. Jun 11, 2019 #1361

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland
    -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

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    Actually Ducted fan has 30% more static thrust than same diameter open prop with same HP engine.
     
    henryk likes this.
  3. Jun 12, 2019 #1363

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland
    >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

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    Yes, it is, but for what kind cost and complexity?
     
  5. Jun 12, 2019 #1365

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland
    -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

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland
  7. Jun 19, 2019 #1367

    Malish

    Malish

    Malish

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    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

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland


    -concurenz not sleeping !

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

    Malish

    Malish

    Malish

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    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
     
    Charles_says, rv6ejguy and BJC like this.
  10. Jun 20, 2019 #1370

    Malish

    Malish

    Malish

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    And some video of today test's:

     
  11. Jun 20, 2019 #1371

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland
    =very hard (bad) conditions for first fly tests ...
     
    Chilton likes this.
  12. Jun 20, 2019 #1372

    rv6ejguy

    rv6ejguy

    rv6ejguy

    Well-Known Member

    Joined:
    Jun 26, 2012
    Messages:
    3,549
    Likes Received:
    2,574
    Location:
    Calgary, Alberta, Canada
    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

    Malish

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    Yes, this aircraft still have LS6 engine on it. LS7 engine with your EFI system will go on second aircraft.
     
    rv6ejguy likes this.
  14. Jun 22, 2019 #1374

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland
    iff to install greater ("grass") tires ?
    (temorary,for this airfield...)
     
  15. Jun 22, 2019 #1375

    Malish

    Malish

    Malish

    Well-Known Member

    Joined:
    Oct 11, 2013
    Messages:
    379
    Likes Received:
    621
    Location:
    Russia. City of Volgograd
    Are you cresy?
     
  16. Jun 23, 2019 #1376

    henryk

    henryk

    henryk

    Well-Known Member

    Joined:
    Mar 8, 2010
    Messages:
    4,547
    Likes Received:
    417
    Location:
    krakow,poland

Share This Page

arrow_white