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  1. D

    Impulse IF-1

    There is/was EAA chapter 1000 at Edward's AFB, buy I don't have any details about them.
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    New rotorcraft concepts

    Can't find a reference about stability of a flying wing and pusher props. I'm sure I read it years ago but I'll just withdraw the statement. If a tractor prop airplane is displaced nose up during flight but still moving in its original direction due to inertia, the thrust vector is above the...
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    New rotorcraft concepts

    Yes and I'm not sure what the difference was. I had the same thought after I posted and was coming back to comment. Only thought I have is the force on the aircraft being applied at the prop disc vs. somewhere further forward in the jet engine. Total guess, though. I know I read that long ago...
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    New rotorcraft concepts

    Tractor props are destabilizing, pushers are stabilizing. That's one reason early flying wings that switched from props to jets had stability issues.
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    3D printed Carbon Fiber Wing Ribs???

    As far as size, the latest variation on 3d printers is for the bed to be a conveyor belt and the print head to ride on a frame that is 45 degrees to the bed. This allows an unlimited length print as long as you upport the outfeed. I'm planning on building one that will do 19" by 14" by...
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    Concepts only: Doodles without numbers

    He did an AMA (modelers) talk on the same subject.
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    Stitch and glue (or tack and tape) airplanes?

    A first approximation of a conventional design single seat fuselage, no fairing or filleting. 15 feet from firewall to beginning of tailcone. Full canopy optional, especially on an ultralight version. Cut out of 4 pieces of 4'x8'x1/16' okume marine plywood. Just the plywood comes to about 21...
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    Stitch and glue (or tack and tape) airplanes?

    No question a square fuselage would be simpler and just as good. My example was pretty much the extreme case of where the idea could go. Think Cri-Cri as a good choice for this method.
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    Stitch and glue (or tack and tape) airplanes?

    Just to get an idea what this might look like, here is a fuselage that is 15 feet long, firewall to tail, and 2 feet wide at the widest point. Not even a real design, simply a rough example. It uses octagonal cross sections, 4" radius fillets at the firewall tapering to zero at the tail and has...
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    Minimum drag just prior to flow separation?

    Bob Liebeck was my professor for an aircraft design class I took at USC many years ago in a previous life. Didn't realize how special that was at the time. "Theory of Wing Sections" mentions his design and comments that those high lift, low drag airfoils have a characteristic behavior of sharp...
  11. D

    Making a fiber rod with certain tension strength and thickness

    The book is expensive for something with a relatively low number of pages but the information is very interesting and useful. I'm happy with my purchase and recommend the book. VJ
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