Decalage angle

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

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  1. Sep 5, 2019 #1361

    Eugene

    Eugene

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    I was talking to someone with wind tunnel experience today. He was telling me that they start seeing separation after 5°. And for sure after 8° you will have separation at 100 MPH


    558F0053-4A6E-4154-AF8A-6BE320671A77.jpeg
     
    Last edited: Sep 5, 2019
  2. Sep 6, 2019 #1362

    Eugene

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    6D8BA8D4-5825-4E82-98C0-DEAC0DCBD2D6.jpeg F268CC82-FBCE-4E57-A4F6-D4239F4AB5C4.jpeg 4D37267E-E3F6-4B02-9D45-1E017E8BDC5F.jpeg F624051E-3010-42F6-A21A-BB3A1930E477.jpeg 2A34F8CE-D097-4564-B0E7-05675EDF53FD.jpeg 60C597F6-B230-43C7-A671-622D63C848F7.jpeg E226EC30-DFFE-4D3C-8EE4-76504B99CFEC.jpeg E47FBAF6-D384-4425-90A8-A8AC61117867.jpeg D1D5A45E-03E2-4FC1-B939-CD72F5A0CE66.jpeg AC895D33-1B61-4DCA-AE6F-B405FC68C6E9.jpeg

    Just wanna make sure that it looks right before I feel everything with Styrofoam
     
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  3. Sep 6, 2019 #1363

    rtfm

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    So what does styrofoam "feel" like :)
     
  4. Sep 6, 2019 #1364

    plncraze

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    I would like to thank rtfm for this test of self control and maturity. o_O
     
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  5. Sep 7, 2019 #1365

    proppastie

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    Thought you were going to fabric cover.....quicker cheaper,....remember its a Polish aircraft. for test do not need to paint or finish just glue and shrink, at $ 4.35 a yard for un-certified bleed-cloth plus glue about $25 from where you are at.
     
  6. Sep 7, 2019 #1366

    Eugene

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  7. Sep 7, 2019 #1367

    Eugene

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    Sorry, I will try to do better next time.
     
  8. Sep 7, 2019 #1368

    Eugene

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    Hope was to make somewhat flexible and flying experimental platform. Were I can add or remove foam between tuft testing. It's not at all about money. Money I have. What I don't have is time. That is why this project moving forward 10 times slower than I like.
     
  9. Sep 7, 2019 #1369

    Eugene

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    They didn't like my pictures from this morning and asked for dimensions. Maybe optical illusion. Pictures are not blueprints after all. That is OK. I can remove everything in 10 min and start all over again.
     
  10. Sep 8, 2019 #1370

    Eugene

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    4646C41A-32B3-4797-875E-31EF73FC4455.jpeg

    OK, I was told to change the shape of my metal tube like you see on picture above. This way trailing edge will somewhat follow the shape of upper fuselage. Not sure how I will finish empty pocket under the tail boom at this point. But sure I can think about something when I get that far .
     
  11. Sep 8, 2019 #1371

    TFF

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  12. Sep 9, 2019 #1372

    Eugene

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    Yes, to make it smaller was another recommendation. But only by about 15%. I was told that it need to be long enough so airflow from the bottom doesn't get pool up in to the prop. But to do 10 inches is too much, 6 will be good enough. And 48" under the prop will get smaller to 44-42".
     
  13. Sep 9, 2019 #1373

    Eugene

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  14. Sep 9, 2019 #1374

    Eugene

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  15. Sep 9, 2019 #1375

    proppastie

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    Who telling you. ...did they say the results too.....will you be happy with 5%....?
     
  16. Sep 9, 2019 #1376

    Eugene

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    I am talking to Russians with a lot of experience. Nobody else is talking to me anymore. American recommendation from EAA members is simple and with very predictable results - " sell it and get something better". This is right thing to do here in experimental aviation today. And yes nobody know what kind of result I will get. As long as I am willing to try, they telling my what they would try in my shoes. They not as spoiled as we are here. They still fixing things like we did long time ago.
     
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  17. Sep 9, 2019 #1377

    Eugene

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  18. Sep 9, 2019 #1378

    Eugene

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    One of Skyboy owners send me this message. I think what he describe is tail volume for vertical tail is too small. I need someone smarter to confirm. Thank you.

    Screen Shot 2019-09-09 at 10.08.05.png Screen Shot 2019-09-09 at 10.08.36.png Screen Shot 2019-09-09 at 10.09.09.png
     
  19. Sep 9, 2019 #1379

    Speedboat100

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    Try this:
     
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  20. Sep 10, 2019 #1380

    plncraze

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    Thank you for sharing what you are doing and what the folks in Russia think about this. There are a lot of smart folks there and since the average person here does not speak Russian we never hear their ideas. The separation they see after 5 or 8 degrees makes sense. High velocity air is low pressure and it wants to separate. Keep those drawings and pictures coming!
     
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