Build your own HO229 WW2 German Jet Fighter!!

Discussion in 'Hangar Flying' started by Aerowerx, Jul 14, 2019.

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  1. Jul 23, 2019 #81

    Speedboat100

    Speedboat100

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    Horten brothers were totally uneducated sailplane fanatics. Prandtl never even realized a flying wing could be made.
     
  2. Jul 23, 2019 #82

    Speedboat100

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    Of course it does..your flying wings have 4 x wider chord at the root of the wing than on the tip.
     
  3. Jul 23, 2019 #83

    Speedboat100

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    Here a graph shows that straight wing has elliptical spanload whereas swept has always e spanload.
     

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  4. Jul 23, 2019 #84

    Red Jensen

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    Juke, you’re just making a fool
    Of yourse
    That makes zero sense.
     
  5. Jul 23, 2019 #85

    Speedboat100

    Speedboat100

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    So he claims.

    Anyway...as you suggest the wing is the thing...now lets put man inside..it needs a long chord in the middle. What does the spanload look now on the each three examples ?
     

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    Last edited: Jul 23, 2019
  6. Jul 23, 2019 #86

    Red Jensen

    Red Jensen

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    Juke,

    You are locked into the elliptical way of thinking. Platform alone does not dictate spanload. Please, for everyone’s sake, read and UNDERSTAND the paper before commenting further.

    Hint: We use twist to vary the spanload.
     
  7. Jul 23, 2019 #87

    harrisonaero

    harrisonaero

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    I think Tunnels is back but without the !! identifier this time.
     
  8. Jul 23, 2019 #88

    Aerowerx

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    <Insert Deep Sigh Here>

    Read and understand this....

    He started with an ELLIPTICAL wing shape to begin with. That is why it had an elliptical distribution. It has nothing to do with being straight. And he shows in the video that when the wing was swept, the distribution changed, so how can you say that it is elliptical when straight and ALSO elliptical when swept????

    Read and understand the this ^^^^^
     
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  9. Jul 23, 2019 #89

    Speedboat100

    Speedboat100

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    Ok...non swept is better than straight as a term to describe what he was trying to push through. I am just at awe how come he became into totally different cocnclusion as Al Bowers with 24 years of experience on the subject.
     
  10. Jul 23, 2019 #90

    Speedboat100

    Speedboat100

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    Are you saying the twist is enough to keep the plane direction straight when one engine is out and you have two ? You certainly need the split aileron ( brake device ) ...but will it damage the aerodynamics into a state where the plane no longer can sustain decent flight ?
     
  11. Jul 23, 2019 #91

    pictsidhe

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    Oh!!!! No!!!! Not!!!!!! Tunnels!!!!!!!!!!
     
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  12. Jul 23, 2019 #92

    pictsidhe

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    That will depend on the airfoils and the twist distribution
     
  13. Jul 23, 2019 #93

    Speedboat100

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    Is it ( lift distribution ) then bell, P or E shape..when all the best choices and means are used ?
     
  14. Jul 23, 2019 #94

    pictsidhe

    pictsidhe

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    That's easy, he has a website that calculates stuff for him. No need for theory when you have a website!
     
  15. Jul 23, 2019 #95

    Speedboat100

    Speedboat100

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    I think he ought to let us have a well studied flying wing for all to fly.

    I assume Hortens bros also studied bats ?
     

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  16. Jul 23, 2019 #96

    Speedboat100

    Speedboat100

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    Suntin like this...the computer define aerodynamics for him ?!
     
  17. Jul 23, 2019 #97

    Aerowerx

    Aerowerx

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    Did you forget the tons and tons of RC flying wings? And all the hang gliders and powered trikes?

    Aeriane Swift? (and, yes, it does have wing tip rudders. Still, no conventional tail and empenage).

    [​IMG]
     
  18. Jul 24, 2019 #98

    Speedboat100

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    But if flying wing is so much more efficient...we ought fly only those.
     
    Last edited: Jul 24, 2019
  19. Jul 24, 2019 #99

    Speedboat100

    Speedboat100

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    Torenbeek says this:

    An elementary analysis has been made of generic wing-body configurations with variable volume allotment in wing and body, for constant total useful volume, including the all-wing configuration. These aircraft were compared on the basis of the Lift-to-Drag (L/D) ratio, for specified flight conditions. In addition the parameter ML/D for constant corrected thrust has been optimized, resulting in certain combinations of altitude and speed for maximum specific range (if corrected TSFC = constant). Finally, the effect of volume allotment on L/D for given engine size was studied. It has been found that in many cases optimum volume allotments indicate that wing-body combinations are to be favored. Only in the case of relatively low Mach numbers and high-altitude flight the flying wing outperforms conventional aircraft, but it will generally require larger engines.

    https://www.jstor.org/stable/44547589?seq=1#page_scan_tab_contents


    I am fond of the motorized solar powered possibilities of this configuration...albeit I'd put the fins on it.
     
    Last edited: Jul 24, 2019
  20. Jul 24, 2019 #100

    Aerowerx

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    You are right. But flying wings are harder to design than tailed aircraft, and get right.

    Also, efficiency is not the only parameter to consider. You have to think about the purpose of the aircraft, too. Some jobs may be more suited to tails, such as large cargo aircraft. Or STOL bush planes used in rough country.
     

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