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  • Users: AminG
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  1. AminG

    Need comments on Aero-tech books?

    Arto, Thank you for the wonderful reference link!!
  2. AminG

    Air velocity and stall angle...

    Hello, Have you verified that the airflow does not change angular direction with airspeed? Another way of saying this is "are you sure that everything else is constant except for airspeed and angle of attack. Did some wind tunnel testing years ago and found that the wind tunnel was not...
  3. AminG

    Supersonic aerodynamic drag in a barrel - Help!

    Hello, Please do a search on the term "Ballistics Equation", there are some more links and information on this topic. It may help you. Good luck
  4. AminG

    Acoustical Scanning of Airframes, etc

    I am working with a colleague of mine who came from Russia - this method of detection is not new and can be adapted to several dozen other uses.
  5. AminG

    Ideal gas pressure curve VS Adiabatic pressure curve

    Hello Sonargod, I think you may be simulating the ballistics equation and I will dig this up from my notes as I know I cannot quote the equation from memory. During my school days, we did exactly what you are doing and I wrote a code which simulates pressures, temperature of the gas including...
  6. AminG

    thrust and drag software for rotors

    Hello Paul, Drop an email to me (AminG@adelphia.net) - I might have some stuff for you regarding Xrotor
  7. AminG

    thrust and drag software for rotors

    Hello, I downloaded Xrotor just for fun from the following site. http://www.aeromech.usyd.edu.au/AERO4290/docs/xrotor/ It works for me. My operating system is Windows XP.
  8. AminG

    zero lift and induced drag

    Hello, The induced drag is more accurately called "lift induced drag". You are correct that at zero lift (cl = 0), the lift induced drag would be zero. But the total drag will not be zero. Also, the formula for lift induced drag is more accurately: Cd(lift induced) = cl^2/(Pi * e * AR)...
  9. AminG

    POST STALL AIRFOIL BEHAVIOR

    Hello Mohr, The book, Ducted Fan Design, which also has notes on propeller design, recommends designs for propellers such that the operating point is below 80% of the stalling angle. I do not know of any book or publication that has post stall airfoil behavior.
  10. AminG

    Propeller sizing

    There are several propeller design programs (ie. Blade Gen, CFX, etc.) One can also write a potential flow program to determine blade profile, possible selecting a profile at an angle to minimize induced drag. There are several documents on this subject (freely available) at the NASA document...
  11. AminG

    Standards familiarization for new hires

    Regarding Canadian Universities - you might want to ask local aerospace companies (ie. Bombardier, Pratt & Whitney, etc) what they would recommend. I liked in order Ryerson University, Carlton University and University of Toronto. I know that Ryerson introduced in their Aerospace program...
  12. AminG

    Training New Hires

    Second the motion: The book by Jean-Claude Flabel, "Practical Stress Analysis for Design Engineers" is superb. His website is www.psa1.com. I recently ordered the book and I would highly recommend it along side of Bruhn.
  13. AminG

    compressible flow

    Shirajpn, Isentropic flow in general terms means a flow with no lossess (no friction, no heat transfer losses,etc). It is a flow with no entropy change. The assumption of isentropic flow greatly simplifies the mathematical model used to describe the flows be it subsonic, transonic or supersonic.
  14. AminG

    Aircraft edge distance

    I recall using a distance of 2 times the diameter for the edge distance. This was a general rule used to check design.
  15. AminG

    Training New Hires

    I would be interested in seeing a FAQ for stress as well. I recall seeing a Boeing Stress manual - never had the chance of using it. As to getting tired of answering the same questions - now you know how your prof's felt and how your supervisors felt when you were at your first real job.
  16. AminG

    Axial Flow Compressor Efficiency

    You may want to check out: http://www.jsmatt.com/custom1.html Jack D Mattinly is a co-author of Aircraft Engine Design and on this website their may be data available for you to use.
  17. AminG

    Wing performance issue

    You might want to try AVL which gives good estimates of wing performance

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