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  1. L

    Parts For Sale Free worktables Irving, TX

    I posted these a while ago, thought I had a buyer but the guy was just jerking me around (that's what you get from Craigslist) so now I'm offering them for free. They are in a storage unit in Irving, TX - just come and get them. Two worktables, both made using the EAA method: one is 8 x 4, the...
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    Parts For Sale Worktables / Tools fire sale Irving Tx

    I'm no longer using my worktables and tools and would like to move them from a storage unit so here's you chance to get some used but usable tools etc for minimal cost, and some just for free. These probably aren't worth paying for shipping so this will probably be mostly for the builders in...
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    Parts For Sale Free flight bag - Irving, TX

    I have a new and unused flight bag for anyone who can use it. It's 21" long, 12" wide and 10" high. Free for pick up in Irving TX or if you're not in this area and really want it PM me and we can discuss shipping cost.
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    In pictures: Oshkosh EAA Airventure 2014

    160 pictures of Airventure for your viewing pleasure: In pictures: Oshkosh EAA Airventure 2014
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    Fatal Loehle 5151 crash in CA

    The story >> Kathryn's Report: 06/21/14 The owner had just done his first test flight two weeks ago >> https://www.youtube.com/watch?v=o6gsvRT0TPY and https://www.youtube.com/watch?v=y0vAC7uVtn4 A few comments here from the Loehle Yahoo Group...
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    Engineering Conversion Factors for Homebuilders

    Some helpful conversion factors for the amateur designers: :silly: 1 . Ratio of an igloo's circumference to its diameter = Eskimo Pi 2. 2000 pounds of Chinese Soup = Won ton 3. 1 millionth of a mouthwash = 1 microscope 4. Time between slipping on a peel and smacking the pavement =...
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    Truss load analysis

    I wonder if you guys who have done truss design can tell me if I’m on the right track with my analysis. For my hypothetical airplane (the picture below is not the actual truss) I’ve calculated the 4g internal loads (x 1.5 = red arrows), moments and reaction forces (RF 1 is the main spar, RF 2...
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    RAF P-40 found in the Sahara

    Remarkably well preserved. Granted the desert is a rather large area, but I'm surprised it went undiscovered for so long. I wonder what else is out there.... P-40 in Sahara desert
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    Connecting wood box spar

    I'm planning to start building the Vampyr flying wing soon, and due to limited space (it's a garage project for now) I'd like to make the 24' wing in two sections, joined at the center. I can calculate the size of the connecting fittings/straps and bolts, but I'm wondering about drilling through...
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    Duxford Battle of Britain Airshow

    For those who like the Spitfire: Flightline UK - Duxford Battle of Britain Airshow - Review It's a short video, but some great shots of the Spitfire and several other WWII fighters. Imagine the sky filled with planes and trying to make sense of it all. And stay alive.
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    Another spar attachment question

    I've searched the threads, learned a bit, but still have a question: I'd like to use a wing planform with approximately five degrees of sweep, purely for aesthetic reasons, and am not sure about the best spar arrangement. I've thought of two options, and would appreciate some opinions: 1) for...
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    Airfoil data

    What does one do to overcome the problem of the variation in calculated/published airfoil data when designing a new project or analyzing an existing one? My issue right now is the pitching moment coefficient for the Pelican/Vampyr flying wing airfoil, but the question is obviously applicable to...
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    FAR 23 Appendix A loads

    I wonder if someone could help with Figure A7 - Chordwise load distribution, specifically the definition of d’: “ratio of distance of center of pressure of a unit spanwise length of combined stabilizer and elevator measured from stabilizer leading edge to the local chord”. I believe I understand...
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    Another airfoil selection question

    I'm at the point where I need to select an airfoil for my design, and I've narrowed the choices down to about half a dozen, but now I'm stuck. Given the well documented discrepancy between wind tunnel derived data (NACA, etc) and computer generated estimates (my comments are only related to...
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    Swapping cloth covering for wood

    Looking at the Loehle 5151 wood frame/cloth covered plane, I've seen several people cover the wings and fuselage with 1/16" (or slightly thicker) plywood. I'm sure some do it because they prefer that look to fabric stretched over the frame but does it also strengthen the structure so the Vne and...
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    Torsional vibration

    Hello all, I've been doing a bit of reading about torsional vibration and one common theme is interesting - it appears that the aviation community is by far and away the most concerned about this issue. There are plenty of other "systems" that use long drive shafts - automobiles, boats, jet...
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    Is Strojnik any good?

    Hello all, Is anyone familiar with the three volume set by Alex Strojnik on low power aircraft design? I've never seen this author mentioned when people ask for recommendations. Thanks, Leland
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    Falco fuselage

    Hello all, I was looking at some construction pictures of the Falco all wood airplane and I've got a question about the aft end of the fuselage. From what I can see, the rear fuselage section consists of laminated formers and four longerons. Each former has one horizontal piece at what...
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    Twin vertical stabilizers

    Questions for you designers out there: if an airplane were to be designed with twin vertical stabilizers, is the area for each v.s. half the calculated area for a single v.s, or is there a specific ratio or altogether different formula when using two? Also, must they be at an angle to...
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