Decalage angle

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Eugene, May 29, 2017.

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  1. Sep 10, 2019 #1381

    proppastie

    proppastie

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    Yes , you have an "aft CG " marginal stability aircraft,....keep the nose down and the speed up..... I hope you can fix it......perhaps your wind-tunnel friend can make a quick Styrofoam model and put it in the wind tunnel.
     
  2. Sep 10, 2019 #1382

    Eugene

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  3. Sep 10, 2019 #1383

    Eugene

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    Still trying to find logical way to finish this piece, so everybody would agree with. It is not easy to make everybody happy. A3319CD4-AF68-41FA-B019-9504D783B51F.jpeg 3C3C296C-76E3-4EC8-BAB1-5C92EB388776.jpeg 1AB46D3D-69E3-4604-804A-98D0BDB744A3.jpeg 050E8786-1AEA-4CE5-BC6A-5FBAE23932B4.jpeg C1E80426-B1B5-4E27-A162-5FBED0618C48.jpeg
     
  4. Sep 11, 2019 #1384

    plncraze

    plncraze

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    The tufts will have your answers. The battle between surface area and streamlining is tough.
     
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  5. Sep 11, 2019 #1385

    Eugene

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    OK, looks like, this will be more ore less final configuration. Spend some time to make sure that it is inline with airframe. Wondering if this whole thing will make tail boom stronger and eliminate deflection under load.

    CbjjCozNTiGc7z99V8mNQg.jpg fullsizeoutput_17fc.jpeg 4V8obDu6Snuop6XjgVTgyQ.jpg hRa%9LV1Ru+mPRsxKSKudQ.jpg OYD7xMuLQj+gZtK6gSp3qQ.jpg imUBhtuVThOxQZ7J2Jdx9w.jpg f95JDKaeTp+y2VffiAcRPg.jpg a6mW1jN8QTaP%wipViuAGQ.jpg
     
  6. Sep 12, 2019 #1386

    Eugene

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    This definitely turned into a pretty solid structure to my surprise. For sure I will not be afraid to fly with it. And maybe I’m reading too many books lately, but it looks better this way. But maybe it’s in my head. DA754C34-C59F-4471-9360-8229A33B5B0F.jpeg 68C09BAD-8FB1-47A3-A1CF-866F520019CB.jpeg 9B65B8C0-7A63-4DF4-91E6-ADE65F5EBDA2.jpeg 450A009B-5124-4472-87E3-4BFE633FD277.jpeg 99051A16-68BC-49D7-B8FF-C1FD3D0ECA9B.jpeg F227E489-6917-454B-BE93-AC74B76006C2.jpeg 8924D627-1596-4B05-B32D-80095391513B.jpeg
     
  7. Sep 13, 2019 #1387

    Eugene

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  8. Sep 14, 2019 #1388

    Eugene

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  9. Sep 25, 2019 #1389

    Eugene

    Eugene

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    I was kicking different ideas for a while about best way to do this. This is what I came up with so far. It should work. Top part will remained open so I can fill it up with liquid foam.


    9BBF8FDC-DD98-49EB-B38E-5AB83A73758D.jpeg 46AC182F-915B-469C-AFEC-CD5EDAF1CE33.jpeg 29F1E43D-53FC-4E5B-9BD4-C99C85151512.jpeg E1C7116C-39FE-4F8B-9694-DA4FA381C3E9.jpeg A5845BDD-5EA3-406C-BAA9-6E2EA5D676A8.jpeg 56B87E2F-2973-4BC0-8E76-75F4395417FB.jpeg
     
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  10. Sep 26, 2019 #1390

    Tornado Flyer

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    If you attach this contraption, how much more difficult is it going to be to remove the rear fiberglass?
     
  11. Sep 26, 2019 #1391

    Eugene

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    Not if. This contraption is already attached to the rear fiberglass.

    My plan is to create flying foam plug. Should be possible to add or remove foam between tuft test flights. If I see any drag improvement at all, then I will park airplane and finish this plug. So, I can make molds from it.

    After removing molds this whole contraption will be destroyed down to original rear fiberglass afterbody. That old fiberglass should have very little damage to it. So I can still fly and use new mold to build new afterbody right in my living room in January.

    Screen Shot 2019-09-18 at 22.27.41.png Screen Shot 2019-09-18 at 22.24.01.png Screen Shot 2019-09-18 at 22.14.55.png Screen Shot 2019-09-18 at 22.14.06.png
     
  12. Sep 26, 2019 #1392

    mcrae0104

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    Rounded wingtips do not produce less drag.
     
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  13. Sep 26, 2019 #1393

    Eugene

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  14. Sep 28, 2019 #1394

    Eugene

    Eugene

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    I am getting little bit suspicious about this project. This whole thing turning into pretty large additional area. We will see. Time will tell.


    FDB288E6-F388-42BA-8499-6D32CC8F7544.jpeg 7D7C1048-D718-48E5-AE96-064E380984A8.jpeg 17F9472A-F1B3-4C87-BF89-0214DF2CAEFD.jpeg 71F2DA6E-8DA7-425C-AFA2-E6945898B2D4.jpeg
     
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  15. Sep 28, 2019 #1395

    Eugene

    Eugene

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  16. Sep 28, 2019 #1396

    plncraze

    plncraze

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    Where did you get the cfd pictures? Those are cool!
     
  17. Sep 28, 2019 #1397

    Eugene

    Eugene

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    I was trying to find pictures of very successful German aircraft - flight design. I wanted to see how smart people with wind tunnel capabilities designing rear fuselage. And I found these pictures on their website.
     
  18. Sep 30, 2019 #1398

    Eugene

    Eugene

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    Looks like I am ready for foam without getting this stuff all over the floor

    2E9B02AB-B048-4E07-A5DE-3D9C66696538.jpeg
     
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  19. Oct 2, 2019 #1399

    Eugene

    Eugene

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    Didn't have enough foam. Need to get some more.

    fullsizeoutput_1878.jpeg rrcgmUkJTcuRzcLegcBEKw.jpg
     
  20. Oct 4, 2019 #1400

    Eugene

    Eugene

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    267FD924-DDF6-44AA-87AB-A20FEE10FE43.jpeg Still not enough!!! Will get more tomorrow . Anybody have any doubts that this is hundred times more fun than flying straight and level ???!!!
     

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