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  1. P

    Validity of scale model tests

    Test program of a 15% dynamically balanced aircraft. https://www.youtube.com/watch?v=cUXseWgu3NA The test program followed the procedure spelled out in NASA Technical Note: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800004771_1980004771.pdf
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    Torsional stiffness for 2 spar wing

    NACA did a technical report on this: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930091581_1993091581.pdf
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    Lift strut with fixed as opposed to pinned ends

    How about a cabane strut at the halfway point? That would really increase the allowable column load.
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    Robin Ultralight

    About How much does that covering method weigh, per square ft?
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    Spinning an Icon

    This is one of the NASA papers: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800004771_1980004771.pdf SUMMARY OF RESULTS Flight tests have been conducted to determine the effect of wing-leading-edge modifications on...
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    Spinning an Icon

    The black line is the NACA 2412 and the red line shows the NACA 2412 with a cuff. It was run in XFOIL. It shows that the cuffed section maintains the same zero lift angle, but can reach a higher stall angle, improving the stall of the outboard wing. The zero lift angle is maintained because the...
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    Spinning an Icon

    The NACA 2412 uncuffed and cuffed:
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    Bruhn - Airplane Structures vs Flight Vehicle Structures

    The version you have has a section on wooden airplane design that is not included in the later versions.
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    Should I set a record even if I won't win the prize?

    Paul MacCreadys motivation for building the Gossamer Condor was to win the Kremer prize so he could pay off a $100,00 bank loan from a failed buisiness. He got fame and fortune! Read "More with less", by Paul Ciotti
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    How do I gusset a 3D truss joint?

    Staggering the joints works fine and does not degrade the stiffness if the structure. Par
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    How much less efficient are rag wings than their ideal rib airfoil?

    The pink foam on Deadulus is for holding the airfoil shape, looks like the first 15% of the bottom and about 60% of the top, are the most critical zones for those airfoils. The designers must have decided that the foam was worth adding. Each section was custom cut, and it took lots of time...
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    Spin Prevention By Design

    Leading edge cuffs help stall/spin: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800004771_1980004771.pdf
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    Can wood be trusted?

    Wood can be very strong and dependable, IF it is carefully inspected to insure that it is of high quality, straight grain, no pitch pockets, knots..........
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    Custom fuel tanks

    Hi Dana, The Tony Bengelis book "Sportplane Construction Techniques" has a chapter on making a composite fuel tank. I used it to make wing tanks for my plane, and they have worked fine. And I found this example...
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    What software do you use?

    Tom, I use the "Axial loads" from the results menu, then "Select all" and "Copy", then paste it into Excell, all the numbers go into individual cells. The members can be sized and the stresses determined. Cadre also provides the length of each member so compression members can be checked for...
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    What software do you use?

    Hi Tom, I generate the drawing in a CAD program (KeyCreator) and export a DXF. I then import it into Cadre, this works great. You then have to assign properties to the members, and bounds and loads to the nodes and you are ready to go! I use EXCEll because it is easier when there are lots of...
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    What software do you use?

    I have been using CADRE Pro for a welded steel fuselage. It does do a good job with trusses, but I use Excell to create the data file and only used Cadre for getting the results. Attached is a view after a run. Pat
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    Top Rudder-You gotta see this

    Here is a real one:
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    EAA Gear Load Spreadsheet

    tp Check out this photo. Grove Aircraft Company# If the gear mounting does not allow the center part of the gear to deflect, then the amount of deflection at the wheel is reduced and the g-load increases. Pat
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