Design > Stunt design

I. C. Engine vibrations.

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Chris Wilson:
Has anyone pondered about vibes from an I.C. engine contributing to it's aerodynamics?
I know there is some evidence that hinge lines benefit by shaking loose stiction but that's not what this is about.
Perhaps a rough shark skin surface combined with 10,000 micro movements a minute may help flow.

Now that I have thrown the meat into the lions cage let's see what comes up.
Chris.

Ken Culbertson:

--- Quote from: Chris Wilson on April 09, 2021, 04:01:32 PM ---Has anyone pondered about vibes from an I.C. engine contributing to it's aerodynamics?
I know there is some evidence that hinge lines benefit by shaking loose stiction but that's not what this is about.
Perhaps a rough shark skin surface combined with 10,000 micro movements a minute may help flow.

Now that I have thrown the meat into the lions cage let's see what comes up.
Chris.

--- End quote ---
The only thing that I personally feel that vibration *adds* is that you can see all of the loose balsa you forgot to get out of the canopy bouncing around.
I have 57 years flying IC and only 4 invested in electric.  Once I learned that the controls needed to be free of all binding because of the lack of vibration all I found was a plane that flew better, even the ones I converted.  So if vibration adds to aerodynamics then the high frequency vibration of the electrics must be even better.  I do miss the sound....

Brett Buck:

--- Quote from: Chris Wilson on April 09, 2021, 04:01:32 PM ---Has anyone pondered about vibes from an I.C. engine contributing to it's aerodynamics?
I know there is some evidence that hinge lines benefit by shaking loose stiction but that's not what this is about.
Perhaps a rough shark skin surface combined with 10,000 micro movements a minute may help flow.

--- End quote ---

Right off, I don't know. My gut feeling is that it doesn't matter, but I would be open to contrary evidence.

    Brett

Chris Wilson:
It would be interesting to deliberately get away from dead flat high gloss finishes and try something similar racing yatchs riblets skin developed at Langley by NASA.
It's available in tape form and designed to reduce subsonic flow.
Chris.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.nasa.gov/centers/langley/news/factsheets/Riblets.html&ved=2ahUKEwiJuq6j0_TvAhVegtgFHWSjASsQFjAFegQIDhAC&usg=AOvVaw1vxl2Mw_pHMwVav5k19ngh&cshid=1618091171943

Brett Buck:

--- Quote from: Chris Wilson on April 10, 2021, 03:18:25 PM ---It would be interesting to deliberately get away from dead flat high gloss finishes and try something similar racing yatchs riblets skin developed at Langley by NASA.
It's available in tape form and designed to reduce subsonic flow.
Chris.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.nasa.gov/centers/langley/news/factsheets/Riblets.html&ved=2ahUKEwiJuq6j0_TvAhVegtgFHWSjASsQFjAFegQIDhAC&usg=AOvVaw1vxl2Mw_pHMwVav5k19ngh&cshid=1618091171943

--- End quote ---

   Or, as a smaller-scale experiment - festoon it with VGs , trip strips, turbulators, and zizag strips.

     Brett

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