Ducted fan aircraft

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

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  1. Sep 6, 2019 #1501

    Malish

    Malish

    Malish

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    The idea was to have jet fighter looking airplane, that also flying like a jet(no prop moments), but same time be not expensive to own and operate and can be flown by average GA pilot(not jet fighter pilot).
    In the future, this aircraft will be electric powered, but still with duckted fans.
     
    Last edited: Sep 6, 2019
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  2. Sep 6, 2019 #1502

    nicknack

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    My numbers are for each engine..
    for both engines working it will x2 as you pointed out.
    Full power only for turbines only sustainable for takeoff, cannot be used for whole hour unless you want to do an inspection every few flights. Maybe burn 20 gallons to reach FL180, depends on what climb rate, I am assuming 1500 to 2000ft/min is no problem for turbine version.

    Max continuous is at 80%. Fly at FL180 or just below if using non-pressurized mask oxygen delivery. Hopefully flying close to 300kts with a total fuel burn of 28 to 32gph. Now if a 800lb class turbofan gets developed fuel consumption should be reduced to 60ish+ percent.
     
  3. Sep 6, 2019 #1503

    nicknack

    nicknack

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    100% agree, electric will be great. Let the turbines work in big combined gas cycle Electric generation plants. With electric engines being smaller, less vibration, maybe even pitch variable fans are possible and no loss in h/p with altitude.

    Cost wise, the pbs TJ100 is 40k per unit full fadec everything included brand new, not cheap but cheaper than one from the big manufacturers. If it ever comes down to 30k or so per unit it’s a very attractive price.
    Guess we will know the maintenance cost from the sub-sonex community in future.
     
    Last edited: Sep 6, 2019
  4. Sep 6, 2019 #1504

    rv6ejguy

    rv6ejguy

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    I think you need to check your math. BSFC on the manufacturers site is listed at 1.167 lbs./lb. X 337= 393 lbs/hr. divided by 6.6= 59.5 GPH X 2 = 119gph for both engines. Might make 70% power at 18,000 feet so that's 83 GPH in cruise. At least 100 gph in climb and probably at least 30 gph on the ground at idle for both engines.
     
  5. Sep 7, 2019 #1505

    Doggzilla

    Doggzilla

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    Ya, I dont know where they are getting the numbers in their brochure, but if the SFC efficiency is correct then its 119 gph at full thrust.

    At least one of their numbers is very wrong.
     
  6. Sep 7, 2019 #1506

    AdrianS

    AdrianS

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    That's a fascinating panorama.
     
  7. Sep 7, 2019 #1507

    Malish

    Malish

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    I see that, at full thrust is 150 liters/hr(39 gal/hr) per engine. But our aircraft will need 4 of TJ-100 engines to create needed trust, that is 600(158 gal) liters of fuel needed for 45 minutes of flight!
    Our aircraft holds only 280 liters(73 gal) of fuel, that means 20 minutes of flight.
    Better go with electric power!
     
    Last edited: Sep 7, 2019
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  8. Sep 7, 2019 #1508

    Malish

    Malish

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    Did you see our PJ-II "Dreamer"? It's on the grass, behind red "Yak's" and of the left wing of Su-34, painted in the same collars(blue/light green).
    IMG_1169 (Large).JPG
     
  9. Sep 7, 2019 #1509

    nicknack

    nicknack

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    Yup... electric will be great if/when we get the next gen batteries to be more than 2x current densities of ~1MJ/kg.
     
  10. Sep 7, 2019 #1510

    pictsidhe

    pictsidhe

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    Malish, you should see if you can get a photo of your plane lined up with a MIG and a Sukhoi. Perhaps offering to give the right person a 'test' flight would help?
     
  11. Sep 7, 2019 #1511

    pictsidhe

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    It's worse than that. Turbine BSFC climbs rapidly as thrust is reduced.
     
  12. Sep 7, 2019 #1512

    henryk

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    Last edited: Sep 7, 2019
  13. Sep 8, 2019 #1513

    AdrianS

    AdrianS

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    I did.
    It took a bit of panning around. So many blue twin-tailed aircraft there!

    I liked the pop-up info on all the planes when you click on them, even though I don't read Russian - that's how I confirmed that I'd found the "dreamer".
     
  14. Sep 8, 2019 #1514

    Malish

    Malish

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    To take photo with Mig's and Su, we need to land at military airfield, but in Russia it not so easy. But to give you a ride - you're welcome in Russia. thumbnail (10).JPG
     
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  15. Sep 8, 2019 #1515

    Speedboat100

    Speedboat100

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    What is the topspeed of the Dreamer ?
     
  16. Sep 8, 2019 #1516

    Malish

    Malish

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    Vne = 400 km/hr(250 mph)
    Vno = 300 km/hr(187 mph)
    Vfe = 180 km/hr(112 mph)
    Vge = 200 km/hr(125 mph)
    Vso = 130 km/hr(81 mph)
    Vs = 110 km/hr(68 mph)
     
    Last edited: Sep 8, 2019
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  17. Sep 9, 2019 #1517

    pictsidhe

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    Yes, but only one is a cute blue twin tailed baby aircraft! The Sukhois are big aircraft. The MIGs arent exactly small.
     
  18. Sep 9, 2019 #1518

    AdrianS

    AdrianS

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    On my phone, they're all small.


     
  19. Sep 11, 2019 #1519

    Malish

    Malish

    Malish

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    After MAKS 2019 show, we did perform all systems check for next phase of test flights.
    This phase will be more focus on fan's efficiency improvements. P9092024 (Large).JPG
     
    Last edited: Sep 11, 2019
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  20. Sep 11, 2019 #1520

    rv6ejguy

    rv6ejguy

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    Hope all goes smoothly on your test flying phase.
     

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