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  1. berridos

    Low aspect ratio sport plane ideas

    Would love to understand why the central bottom section looks like an inverted airfoil. Bart is really innovative
  2. berridos

    Low aspect ratio sport plane ideas

    That paper is great, thanks. Personally i consider a max CL of 1,65 excellent for an inverted zimmerman, knowing that no stall is possible. That max cl can really be squeezed out and is a practical max cl, not one where i have to forgive the last 20% in order to avoid a potential stall. Such a...
  3. berridos

    Low aspect ratio sport plane ideas

    Would be nice to test a leading edge that is round in cruise and sharp at approach. Some sort of moving wedge that splits the leading edge. Wonder if the allround envelope would improve.
  4. berridos

    Low aspect ratio sport plane ideas

    Verhees has 7º anhedral
  5. berridos

    800cc aircraft engine

    Can that engine be mounted in a tilted attitude or has it to be upright? If it is injected, are you injecting the gasoline oil mixture?
  6. berridos

    Low aspect ratio sport plane ideas

    The retract system of the verhees is reasonably simple and folds onto itself to fit between the legs, but the plans are copyright protected. Still doesnt know if its practical to use a retract on a single long gear leg. Someday i need to calculate the additional weight of that retract system
  7. berridos

    EAA No Longer Has Free SolidWorks

    over the years i just have changed too many times the cad software i use, and at the end, i am not really profeccient in any of the cad offerings. The one i liked most was catia, but maybe because at that time i was young and had a fresh head, or maybe because a licence costs above 50000 bucks...
  8. berridos

    New skin material

    https://techxplore.com/news/2022-02-aeroshark-thin-airplanes.html?fbclid=IwAR2WfL2-wADAsLTqzrvsriMR4MD5rC12tMC0awzMGl6aC5qqoVjrPMCH-Wo
  9. berridos

    EAA No Longer Has Free SolidWorks

    There are a million easy youtube tutorials about doing worthless cfd on 3d wings in ansys, openfoam and freecad, But not a single one that calculates the spanwise lift distribution. At the end its just integrating forces on discrete panels along the wing, but if you arent proficcient its a...
  10. berridos

    Enrique, from Spain... but Germany

    Welcome. We have to meet someday for a Beer as i am also from Madrid.
  11. berridos

    How to hinge and seal a elevon in a very thick airfoil of a ultralight

    I wonder if a frise aileron would be beneficial on tailless airplanes. Also in case of vortex flying mode (high angle of attack) a frise elevon in large cord wings should be more responsive. On my rc prototype i will test a two segment differential frise elevon. differential frise elevon is a...
  12. berridos

    EAA No Longer Has Free SolidWorks

    Has freecad human models, manikins available in some repository?
  13. berridos

    Building a mini bi plane... very new at this

    line-u control i the middle of the rodeo field maybe)))
  14. berridos

    Building a mini bi plane... very new at this

    For the first time we found an application where an electric plane makes sense)))
  15. berridos

    Heat Distortion and Post Curing

    MGS L285 is not a resin design for infusion as it has too much viscosity. I used to like the Sicomin resins for infusion and they have friendly postcure temperatures.
  16. berridos

    Shapes of pontoons.

    What was intriguing in the seagull, was how to achieve the transition from floating on the hull to planning on the skies. The hull looked like uncapable of planning.
  17. berridos

    Shapes of pontoons.

    rocker is the tip curve, scoop is the rear part of the curve. In rough sea, you want enough rocker not to nail the waves. Bad thing much rocker retards planing The scoop has to be straight in order to facilitate early planning (end at the step). No curve there. The edges of the pontoon razor...
  18. berridos

    Shapes of pontoons.

    Sharp corners and concaves improve the early planning ability aswell as cutoff tails. Thats another reason for the step.
  19. berridos

    Heat Distortion and Post Curing

    You could use heatable molds. Heated by electric wire or warm water.
  20. berridos

    Celera 500L (was: More Vaporware)

    any pic of the inner life of that interesting heat exchenger?
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