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    Copyrights, patents and another aviation evolution problems...Any Solutions?

    Hi people, In my opinion, the secrets, copyrights and the fear to show something new go against aviation evolution. I don't want to enlarge this discusion with questions, only with answers. I really think that when we contrast our experience (like this forum), then we can improve our airplanes...
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    Mr. Lednicer about Riblett airfoils, and questions

    Hi all! I discover an opened letter about Mr. Riblett. (link: Riblett airfoils (Walter Lounsbery, David Lednicer, "highflyer")) It's interesting, but I don't understand the point 2, why the induced drag doesn't depend from the airfoil? Maybe because the induced drag is the lift-generated drag...
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    Cruise speed: Balanced Speed or CL/CD max speed?

    Hello people I'm trying to clear my ideas, but after working on it hours and hours, I can't clear my mind now! My airplane is optimize for the Cruise stage. using XFLR5 (very good program) I obtained the performance. I have a Balanced speed in 80 m/s and CL/CD max point in v=50m/s (loiter)...
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    Auto Motor: Aerobatic capable?

    Hi all, 1.- I read that the Wankel motor can be used in aerobatic flight, is this right? why? 2.- Which changes would be made to do a 4 strokes motor able to fly aerobatic maneouvers? Thx!
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    Searching Flap angle with XFoil: Ncrit??

    Hi! I study a lot of profiles to use in my future design with XFoil. I'm studying this programm because it's amazing! But I don't understand 100% the Ncrit factor. In Drela website: situation Ncrit - sailplane 12-14 motorglider 11-13 clean wind...
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    Certificate Auto or Motorcycle motor for airplanes?

    Hi! A lot of auto/motorcycle motors are used in airplanes but...Are there a lot with FAR/JAR certification? With the certification, the safety and reliability must be tested. So, we have an extrasafe in our plane, right? Another question: Are there a lot of parts to add in the "initial" motor...
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    Problems using Motorcycle motor?

    Hi, I'm not a motor expert and I really wonder when I see the next website (down). It's realiable to use motorcycle motor in airplane? (not about if the rpm are good or not, otherwise with temperature and maintain the 70% power 3 hours or negative G's problem, for example). "Motorcycle...
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    With a lot of things to learn...with a lot of fun to do it

    Hello Mrs! I'm Ferran Peláez, a 25 years old B.Sc. aerospace engineer from Barcelona, nowadays I work in Germany. I like to design airplanes, but I don't build-design a really one yet! Only computational tests...cfd or vortex lattice...but not a complet one. This is my objective. I want to...
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