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  1. A

    Number of Overhauls in a Life Cycle of a Lycoming Engine

    How many overhauls can be done before we have to scrap an engine? I do not think different Lycoming or Continental engines would differ much, but let's use Lycoming IO360 as an example.
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    drop atomization and spraying direction in agriculture airplanes

    This topic may not fit here, but experience told me there were all kinds of experts in this forum! During pesticide spraying a drop will atomize further if it has a relative speed to the air around it. The high air speed causes high air shear that will "tear" a drop apart. This kind of...
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    Spraying Arm Width of Air Tractor Planes

    The spraying arm width is shorter than the wing span in an Air Tractor plane. If the spraying arm increases its width to full wing span the plane would be more efficient due to a larger area covered. Why do not they design this way?
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    Wire on top of Air Tractor planes

    There is an exposed wire from the top of cockpit to the top of the vertical tail on an Air Tractor plane. I suspect this is for communication when the plane is low and close to ground. Which channel is using this wire? Does it have other functions, such as structural?
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    Moisture Absorption of Wood

    fumigation? Thanks for all the replies! 12% of dry wood is quite an appreciable amount of weight, especially for aircraft which is always constrained by maximum takeoff weight. I think a more important issue is the variation of the amount of moisture induced weight increase. What is the range...
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    Moisture Absorption of Wood

    I am new to wood usage in aircraft. So please bear with me if these questions are rudimentary. How does one prevent wood from moisture absorption? Moisture absorption will change the weight and balance of the whole aircraft. It will also change the mechanical properties of the wood structure...
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    aluminum 7075 tube

    The site does not mention the composition (such as 6061 or 7075). Am I missing something?
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    aluminum 7075 tube

    I need 7075 for its light weight and 80% higher strength than 6061. I use it in a UAV so do not care about its reliability as much as in a manned aircraft. Aircraft grade quality comes with all the traceability requirements and higher price tag that I do not need.
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    aluminum 7075 tube

    I am looking for Al 7075 tubes with a wall thickness of about 80/1000 of an inch, and ODs ranging from 7/10" to 4/3". I can't find them. Anyone has an idea where to search for them? I do not intend to use them in an aircraft, so aircraft grade quality is not required.
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    large high wing composite airplanes?

    I am looking for information on Part 23 high wing composite airplanes, and end up empty-handed. All the part 23 composite airplanes I know are low wings, like SR20/22, DA40, Cessna 350. Am I missing something here? Why nobody builds large-than-LSA high wing composite?
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    Qualifications of A Kit

    The following is from AC 20-27G: Amateur builders are free to develop their own designs or build from existing designs. We do not approve those designs; it would be impractical to develop design standards for the wide variety of design configurations created by designers, kit manufacturers...
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    Interpretation of "Recreation and Education Purpose"

    The whole home-built thing is based on "for recreation and education purpose only". At least FAA sees it this way. If I the amateur build fly my kit airplane to work on every working day, I am using it as a transportation tool to meet my commuting need. This is beyond "recreation and education"...
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    Qualifications of A Kit

    How does a court view the responsibilities of the manufacturers in such cases? Any review literature or summary reports on this topic?
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    Qualifications of A Kit

    That is shocking. So theoretically a kid manufacturer does not need to flight test its kit design before putting it in the market, and bears no legal responsibilities for the safety of the kit!
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    Qualifications of A Kit

    What kind of qualifications must a kit obtain for it to be eligible for sale? I know that FAA has a listing of Eligible Amateur Built Aircraft Kits, but I heard that FAA only check the 51% rule for those kits. Since kit airplanes do not have the certification process, who makes the decision...
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    books/articles/lectures on biplane's wing structure?

    Thanks for all the replies. Ron's explanation was very helpful. There were some paper by Walter Diehl on biplane wing loading, but not wing structure. There is a wood stick pointing into the flow betwee the planes on each side of the fuselage. The two defining points are the cross points of...
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    Propeller Pitch Determination

    I am looking for an APPROXIMATE procedure/formula.
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    Propeller Pitch Determination

    Given the diameter and rpm of a propeller and a cruise speed, how do we choose a propeller pitch? Assume we are optimizing the propeller for cruise condition only. This will go down to the pitch angle at 70% (or 75%) radius station. It will also depend on the airfoil choice. Let's assume we are...
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    books/articles/lectures on biplane's wing structure?

    I would like to know the purpose of each struts and each wires in the biplane wing structure. For example, which one is a flying wire and which one is a landing wire, and how do they transmit the loading. That will require understanding of the structure, the load and path of loading.
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    books/articles/lectures on biplane's wing structure?

    I am working on a wing structure for a biplane, and would like to have some reading on this before design. Are there books/articles/lectures/websites on this topic?
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