Decalage angle

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

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  1. Aug 27, 2019 #1341

    Tornado Flyer

    Tornado Flyer

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    It looks like the trailing edge is up on the right and down on the left. It seems that would cause a constant roll to the right?
     
  2. Aug 27, 2019 #1342

    BJC

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    I’m sure that it does, until the stick is centered.


    BJC
     
  3. Aug 27, 2019 #1343

    Eugene

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    Better picture would answer a lot of questions. What kind of airplane that is? Does anybody know?
     
  4. Aug 27, 2019 #1344

    poormansairforce

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    Just an Ohioan
    That shape came from this idea:
    https://www.rcgroups.com/forums/showthread.php?1608266-Prop-Slot-Noise-Reduction-Design-and-Tests
     
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  5. Aug 28, 2019 #1345

    Eugene

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    I was trying to find fuselage tuft testing video and found this one. I understand now that I have very long.....long....long....long....long....long way to go! ("Six Days Seven Nights" with Harrison Ford)

     
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  6. Aug 28, 2019 #1346

    erkki67

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    No, the controls where just not inline.
     
  7. Aug 28, 2019 #1347

    Eugene

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    Can we get picture from the top? Is there name for this aircraft?
     
  8. Aug 28, 2019 #1348

    Tornado Flyer

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    Not in line? Who puts ailerons that small and that far inboard? They would be ineffective.
     
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  9. Aug 28, 2019 #1349

    BJC

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    Those are full span ailerons, with a notch near the propeller tip.


    BJC
     
  10. Aug 28, 2019 #1350

    Eugene

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    Now it all make sense. Thank you! Perfect example of how good picture can be better than 1000 words.
     
  11. Aug 28, 2019 #1351

    BBerson

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    About 10" prop extension also"
     
  12. Aug 28, 2019 #1352

    erkki67

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    JLG 2 is the name of that bird, I don’t think that there is a picture existing from a birds view.
     
  13. Aug 28, 2019 #1353

    erkki67

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    The designers name is;

    Jean Louis Gehannin
     
  14. Aug 29, 2019 #1354

    Eugene

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    Screen Shot 2019-08-28 at 21.47.10.png

    I would like to know how did we get 16 sq.ft.? Maybe 8-10, but not 16.

    100 HP at 80% prop efficiency = 100 MPH
     
  15. Aug 29, 2019 #1355

    Tornado Flyer

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    Even neutral there is still one tab up and the other down. There would still be a rolling action.
     
  16. Aug 30, 2019 #1356

    proppastie

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    well if the chart and your conclusions are correct......lots of disturbed air, turbulence.
     
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  17. Aug 30, 2019 #1357

    Eugene

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    This time at Oshkosh I spend some time looking at Icon A5. Because I feel so much smarter today than 2 years ago, I see the reason why this aircraft is not very fast. That big boat on the bottom creating a lot of drag. Somewhat similar to my situation. Because I don't need to land on water = there is hope for improvement.

    Screen Shot 2019-08-29 at 21.40.48.png icona5_329114.jpg fullsizeoutput_17cb.jpeg fullsizeoutput_17c9.jpeg
     
  18. Sep 2, 2019 #1358

    Eugene

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    IMG_2997.JPG fullsizeoutput_17c1.jpeg

    Found something else interesting about my airplane. I was taking some measurements for new metal structure on my afterbody project. Idea is to connect everything to the screws you can see on my pictures. I was getting different measurements from left side to right side. I tried many times and and it was starting making me crazy! And I didn't drink that day at all!!!

    Turns out composite fuselage has difference in dimensions by about 22mm or almost 1 inch. Airframe is all symmetrical. Only fuselage was made that way. Not sure what to make of it. I am sure that I can make it work. But how did that happened ??? . In aircraft manufacturing 22 mm difference is normal? Below 100 MPH we don't worry about little thins like 22mm difference???

    fullsizeoutput_17a1.jpeg

    Sounds like they all made that way and left fender always rubbing.


    IMG_1743.jpg
     
    Last edited: Sep 2, 2019
  19. Sep 4, 2019 #1359

    Eugene

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    fullsizeoutput_17dd.jpeg fullsizeoutput_17db.jpeg fullsizeoutput_17d7.jpeg fullsizeoutput_17d8.jpeg fullsizeoutput_17dc.jpeg fullsizeoutput_17e4.jpeg fullsizeoutput_17e3.jpeg

    Best book I found so far. After reading it, I understand now that afterbody on any moving object is very important.
     
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  20. Sep 4, 2019 #1360

    Eugene

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    fullsizeoutput_17e0.jpeg fullsizeoutput_17e1.jpeg fullsizeoutput_17de.jpeg fullsizeoutput_17df.jpeg fullsizeoutput_17e2.jpeg fullsizeoutput_17d9.jpeg fullsizeoutput_17da.jpeg

    So, from drag stand point, my airplane should be called "Skycow" instead of Skyboy
     
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