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  • Users: macoovacany
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  1. macoovacany

    Paint Approval Considerations

    ...radio systems. Aircraft eventually had to be completely paint stripped and repainted. 2) The current batch of commercial paint strippers are acidic*, where as the paint strippers used in aircraft standard practices are basic*. A problem we found with the commercial paint strippers is that...
  2. macoovacany

    Twin Engine Propeller Arc

    How come the propeller arc is behind the pilot in high wing twins (MU-2, Partnavia, Aerocommander) and in front of the pilot in low wing twins (Cessnas and Pipers). Cheers, Timbo
  3. macoovacany

    Rolled Threads and Fatigue

    Maybe I asked the wrong question. What is the simplest way to justify the remanufacture of a rolled thread bolt/stud, where the remanufactured bolt/stud does not have rolled threads. I am aware of the advantages of using rolled threads.
  4. macoovacany

    Rolled Threads and Fatigue

    nashjp, Remanufacture does mean replace with an improved part. The trouble being that the old parts are really strong, or more specifically, we don't know how strong. Israelkk, We don't have to design to the federal spec, we only have to show that the stud remanufacture meets or exceeds...
  5. macoovacany

    Rolled Threads and Fatigue

    Hello all, I have a specially made bolt/stud that requires remanufacture. A materials analysis of the bolt indicates that the threads have been rolled. A quick search on the internet indicates that rolled threads offer 30%-70% improvement in fatigue stress or a ten-fold increase in service...
  6. macoovacany

    Stress Determination by Crack Inspection

    dime/dollar repair? Timbo
  7. macoovacany

    Stress Determination by Crack Inspection

    Hello all, Consider a crack in the middle of large sheet of metal, about the same dimensions as, say, the sidewalls of the engine bay mount for the Cessna 210. The crack was probably initiated by a tool scratch, falling screw driver, whatever. There is now a crack that runs at approximately...
  8. macoovacany

    Vortex Sheader

    Although I'm not familiar with what you would term "low flow rates" as opposed to "high flow rates", this is the first thought that occurs to me. At low flow rates the noise in the flow is of the same order of magnitude as the eddy amplitude. Consider a flow barely...
  9. macoovacany

    Textbooks

    "open the door on every aerodynamic topic I can think of..." Does it have anything to say on diffusers? This is a topic I found particularly difficult to find information on. Especially trying to optimise the pressure recovery versus the drag increase. (For example, some of the...
  10. macoovacany

    Cad-plate fatigue life

    As standard practise, we specify the cad-plate of all steel parts we design to QQ-P-416F. However, it has come to our attention that this may dramatically reduce the fatigue life. On page 287 of "Mechanical Engineering Design" by Shigley and Mischke it states "Metallic coatings...
  11. macoovacany

    Curly ATA question

    This question is a bit off engineering, but maybe interesting none the less. The Beechcraft Baron has an "aft cabin door ajar" warning light. Where do you think that this should appear in the ATA code? a) 52 : Doors b) 33 : Lighting c) 31 : Indicating and recording systems Have fun...
  12. macoovacany

    Body of Revolution Pressure Distribution

    Sorry, not after the drag. I'm after the pressure distribution. Timbo
  13. macoovacany

    Three-Lifting Surface

    Offhand, the Eagle-X has flaps on both the fore plane and the aft plane. The pilot has only one flap control. Also the aft plane has a wing fence and vortex generators immediately ahead of the ailerons. The wing section outboard of the wing fence has a drooped nose. The FAR certification...
  14. macoovacany

    Body of Revolution Pressure Distribution

    Hello, Does anyone know how to derive the pressure distribution of a body of revolution given the geometric section properties. Kind of have the feeling that it is equivalent to the 2-D flow pressure distribution, if the thicknesses were sqrt'ed. Timbo
  15. macoovacany

    Three-Lifting Surface

    Eagle-X, orginally designed in Australia and now owned by the Malaysians is also a three surface configuration. The Eagle-X is certified to FAR-23 standards. I will say no more. Timbo
  16. macoovacany

    I need a good CL equation

    Alpha is in radians, not degrees. 1 radian ~ 57.3 degrees. Timbo
  17. macoovacany

    Rivet Patterns

    Load direction? Sorry, this was not a question specifc to any application just in general, is it better to have rivets (single shear or double shear) lined up in a "square"pattern (upper) or in a "triangular"(or "stitched") pattern (lower). Not necessarily the...
  18. macoovacany

    I need a good CL equation

    dy / dx means rate of change of y with respect to x. (Ignore "daccuracy / dcomplexity > 0 d^2accuracy / dcomplexity^2 > 0 ( allitle bit more accurate means a lot more complex.)" It was my attempt at humour.) Take out a sheet of paper and draw a set of axes on it. Label the horizontal...
  19. macoovacany

    Rivet Patterns

    Which rivet pattern is stronger? (Ignore number of rivets.) + + + + + + + + + + + + or... X X X X X X X X X X X X X X
  20. macoovacany

    I need a good CL equation

    ...accuracy then I would probably recommend doing as PJA has suggested. (Although PJA prefers R.T Jones, Iam going to go back to Prandtl). L = (1/2) * rho * V^2 * S *CL CL = dCL/dalpha * (alpha - alpha0) alpha0 == Zero lift line for an aerofoil section (wings with varying sections or with...

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