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  1. edmacs

    Aero HP equation

    Element94, You can estimated the drag accretion due to scoops using ESDU and NACA papers. First of all, you need to evaluate the system pressure and flow requirements. Flush inlets should be used to minimize drag. Scoop inlets are more suitable for systems with high pressure drop. These...
  2. edmacs

    Flash point

    TD2K, Thanks for your support. However I was unable to find data about fuel jet auto ignition in environments with enriched oxygen concentrations. I don't think I'll be able to get some sort of interlibrary loan because I'm in Brazil. Maybe I may find something in Fire Protection Handbooks in...
  3. edmacs

    Flash point

    Hi all, I´m working with an oxygen enriched zone. However I´m unable to find AIT (and flash point) for fuel in these environments. All data I have founded so far concerning AIT and flash point are restricted for air. I use Jet Fuel: AIT = 210C (410F) and Flash Point = 162C (110F). Thanks in...
  4. edmacs

    Tail Load and Dynamic Stability Re-visited

    Hi all, Well, Jetmaker said that having the wing CG behind the aircraft a.c. (i´m sorry if i happen to misunderstood!). However i think that if a plane is designed so that the wing stall´s before the horizontal empennage there is no problem in having the wing cg behing the aircraft aerodynamic...
  5. edmacs

    Aircraft nose shapes

    I've had a similar question pertaining aerodynamics of buses. Buses have a quite non-aerodynamic form. But can you imagine a bus with an airfoil like configuration? Well, I've heard many different (and some quite weird!)aerodynamic strategies for decreasing its drag. But all concerned with the...
  6. edmacs

    What is creating the downwash on a wing?!

    It's interesting to cite that the additional lift generated using Coanda effect has been used in ekranoplan where small engines on top of canard wings help during take-off. These small engines work only during take-off because the main engines are rather weak: optimized for the...
  7. edmacs

    Canard-wing configuration?

    Hi: Canards seem to be very effective for Ekranoplans, called also WIG planes (wing in ground effect). It seems that canard improve their stability, which is ekranoplans primary disadvantage. Edmar Eng. Edmar Silva

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