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  1. nveneno

    What is optimum number of propeller blades

    The blade tips produce the greatest amount of power loss, but longer blades are affected by the mach number, so there must be a balance between many short blades and few long blades. Additionally, it must be consider that the induced flow in the blades disturb each others. Now with the use of...
  2. nveneno

    Alternating Stress Formula

    There are different ways to relate the fatigue life with the alternating stress levels. Some are the Goodman, Soderberg and Gerber formulations wish use the mean and alternating stress in their relationships. Those equations can be easily transformed to R factor relations replacing it's...
  3. nveneno

    Huth Formula for Fastener Flexibility

    Hi, thanks 40818 & Rb1957 A few years ago, in my internship, I made some test in Nastran simulating fasteners joining two sheets, with RBE (rigid elements), CBUSH (6 dof springs), CBAR (beam elements), and CFAST (connector elements with 6dof springs), I also use different model to get the...
  4. nveneno

    Huth Formula for Fastener Flexibility

    The Huth formula it’s not the only way to get fasteners stiffness, there are also some different approaches to the problems with different results also. -Swift (Douglas) -Tate & Rosenfeld -Huth, Schwarmann (Airbus) -Vought -Grumman -Delft University Which one gives the right answer? That’s the...
  5. nveneno

    Why do flags flutter?

    It's a well known phenomenon the wake vortex behind a cylinder. So I think the flag flutters is mainly due to the interaction with the pole than anything else. Take a look at this picture http://www.eng.fsu.edu/~shih/succeed/cylinder/cylinder.htm...
  6. nveneno

    Problem with engine starters

    Mike Our manuals (PA-28) do not specify any shimming procedure in the starter instalation. Does anothe aircraft have a shimming procedure aplicable to this one? thanks Nicolás Valencia
  7. nveneno

    Problem with engine starters

    Yes Steve, it is the pinion gears that are wearing. We are using the silicon lube ase recomended in the manual, but the problem persist. thanks Steve Nicolás
  8. nveneno

    Problem with engine starters

    In my company’s PA-28 Piper aircrafts, we are experiencing serious problems with the engine starters, for the Lycoming O-540 engines. The problem is after a few hours (about 50 hrs.) wear on the Bendix gear becomes unacceptable. The same problem has happened on three different aircraft at least...
  9. nveneno

    Tech. order

    I checked it a few minutes ago in our technical library and I found that originally the TO 1-1b-40 "weight and Balance Data" were a handbook for crewmembers complementary to the TO 1-1b-50 "Weight and Balance", but now the 1-1b-40 is canceled and all the information were supersedes by the last...
  10. nveneno

    Tech. order

    the TO 1-1B-40 is a general USAF technical order related to weight and balance of aircrafts. There you will find some general procedures and definitions. In any case, you must refer to the specific W&B manual of your aircraft for detailed information about how is computed the basic weight and...

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