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  1. Erwan
    Post

    comparison foil vis surface gliding ski at best angle of attack

    According to Pierre Gutelle "Architecture du Voilier " page 131 For a dinghies the optimum Angle of Planing is around 4.5°
    Post by: Erwan, Jan 30, 2021 in forum: Hydrodynamics and Aerodynamics
  2. Erwan
    Post

    hard wing vs soft wing?

    The teardrop mast/ sail junction is not very streamlined when changing tack
    Post by: Erwan, Jan 3, 2021 in forum: Hydrodynamics and Aerodynamics
  3. Erwan
    Post

    hard wing vs soft wing?

    One of the advantage of a hard wing vs a soft wing (teardrop mast + batten sail), as explained by Joseph Ozanne for BMWOR big tri, afair, was...
    Post by: Erwan, Jan 3, 2021 in forum: Hydrodynamics and Aerodynamics
  4. Erwan
    Post

    hard wing vs soft wing?

    Thank you very much Mr Speer for this "Private Lecture" Your explanation regarding the use & design of bubble ramp is very interesting, and new...
    Post by: Erwan, Dec 18, 2020 in forum: Hydrodynamics and Aerodynamics
  5. Erwan
    Post

    hard wing vs soft wing?

    Thank you Doug I guess you make reference to BL Parameters like the H parameters, I still need to dig here as I am not very comfortable with...
    Post by: Erwan, Dec 14, 2020 in forum: Hydrodynamics and Aerodynamics
  6. Erwan
    Post

    hard wing vs soft wing?

    Thanks a lot DCockey & Doug, I was aware of LSB and the associated "Transition Ramp", used to trigger transition, especially in the case of...
    Post by: Erwan, Dec 14, 2020 in forum: Hydrodynamics and Aerodynamics
  7. Erwan
    Post

    hard wing vs soft wing?

    A rookie question regarding the separation bubbles 1-Are separation bubbles always "Laminar separation bubbles" or does some other form of...
    Post by: Erwan, Dec 12, 2020 in forum: Hydrodynamics and Aerodynamics
  8. Erwan
    Post

    hard wing vs soft wing?

    Thanks for the explanation DCockey.
    Post by: Erwan, Sep 22, 2020 in forum: Hydrodynamics and Aerodynamics
  9. Erwan
    Post

    hard wing vs soft wing?

    Thank you very much for the clarification With rookie's words can one says that : Dissipation is not a natural fluid dynamic phenomenon, but a...
    Post by: Erwan, Sep 20, 2020 in forum: Hydrodynamics and Aerodynamics
  10. Erwan
    Post

    hard wing vs soft wing?

    Thank You Inquisitor, As you seems very proficient with JAVAFOIL, do you know if NCrit options exist or natural turbulences of the atmosphere is...
    Post by: Erwan, Sep 20, 2020 in forum: Hydrodynamics and Aerodynamics
  11. Erwan
    Post

    hard wing vs soft wing?

    Congratulations Inquisitor for your homeworks with JAVAFOIL.
    Post by: Erwan, Sep 20, 2020 in forum: Hydrodynamics and Aerodynamics
  12. Erwan
    Post

    hard wing vs soft wing?

    Slingshot, There is a "concept" or CFD phenomenon, called : "Dissipation" I suggest you to investigate. Unfortunatly, I cannot help you as I am...
    Post by: Erwan, Sep 20, 2020 in forum: Hydrodynamics and Aerodynamics
  13. Erwan
    Post

    hard wing vs soft wing?

    Thanks for your participation Inquisitor, afaik JAVAFOIL can address 2 elements slotted wing, while, XFOIL addresses only single wing section with...
    Post by: Erwan, Sep 17, 2020 in forum: Hydrodynamics and Aerodynamics
  14. Erwan
    Post

    hard wing vs soft wing?

    You are perfectly right Doug, it is my shi..y English which creates the confusion. The essence of my message is :Trust what CFD gurus used to say...
    Post by: Erwan, Sep 16, 2020 in forum: Hydrodynamics and Aerodynamics
  15. Erwan
    Post

    hard wing vs soft wing?

    Very interesting debate here, A long time ago I posted similar questions regarding slotted wingsail/morphing single wing/classic...
    Post by: Erwan, Sep 16, 2020 in forum: Hydrodynamics and Aerodynamics
  16. Erwan
    Post

    Downwash equation for Bell-Shaped spanload distribution

    Sorry, the Smiley is unintentional, just a mistake, I am not digital native
    Post by: Erwan, Mar 26, 2020 in forum: Hydrodynamics and Aerodynamics
  17. Erwan
    Post

    Downwash equation for Bell-Shaped spanload distribution

    Thank you very much Mr Speer and sorry for late answer, this corona has triggered unexpected issues and I wanted to use Vortex a little bit before...
    Post by: Erwan, Mar 26, 2020 in forum: Hydrodynamics and Aerodynamics
  18. Erwan
    Post

    Wind gradient - twist on windsurfing sail

    Please find attached an Excel spreadsheet with VR=Vent Réel = TRUE WIND = 7 m/s TWS= True Wind Speed AWA = Apparent Wind angle BS= Boat Speed...
    Post by: Erwan, Mar 12, 2020 in forum: Hydrodynamics and Aerodynamics
  19. Erwan
    Post

    Downwash equation for Bell-Shaped spanload distribution

    I should add: It could be interesting for How to cut sail, probably only for third league players in the sail industry, as big names like...
    Post by: Erwan, Mar 1, 2020 in forum: Hydrodynamics and Aerodynamics
  20. Erwan
    Post

    Downwash equation for Bell-Shaped spanload distribution

    Thanks you All for your lights DCockey, You read in my mind: My "Case Study" is an A-Cat rig which means constant span, constant area, constant...
    Post by: Erwan, Mar 1, 2020 in forum: Hydrodynamics and Aerodynamics
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