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  1. DeltaWing

    Converting HP to thrust with a jet engine.... A motor jet estimation?

    You're asking for the ratio of thrust to the power required to run the compressor, right? The relevant equations for an ideal turbojet can be found on pages 279-281 of Mattingly's propulsion book. You need to do a cycle analysis for whatever engine design you're interested in. Because the...
  2. DeltaWing

    Getting ahead with a GD&T cert?

    Thanks for the responses. I'll focus on CATIA and NASTRAN for now. It sounds like they're more relevant in the aerospace world. Yeah, I'm interested in stress analysis. I've taken graduate courses in FEA and CFD, but they didn't go into the use of major software packages. It was mostly just an...
  3. DeltaWing

    Getting ahead with a GD&T cert?

    I recently graduated with a Masters in Aerospace Engineering (structural analysis emphasis), and I'm having a hell of a time finding a job. I believe this is largely due to my age (30) and complete lack of engineering experience. Would having a certification as a GD&T Technologist put me ahead...
  4. DeltaWing

    Gas-Liquid Heat Transfer in Pressure Vessel

    I think I made some progress. If I use the Churchill-Chu correlation for free convection from a vertical surface (because the liquid-gas interface is oriented vertically during horizontal flight), with the appropriate data for helium at 540R and a temperature difference of 180 R, I get a...
  5. DeltaWing

    Gas-Liquid Heat Transfer in Pressure Vessel

    Propellant tanks for rocket engines often use helium gas to provide pressure to the tanks. To minimize the amount of gas used, the gas is heated in an exchanger at the rocket nozzle before passing into the propellant tanks. To calculate the heat transfer between the helium and the liquid...
  6. DeltaWing

    Advice for aspiring stress engineer?

    I'm just curious because I've noticed that some of the engineers on this board are very dismissive of FEA, and wasn't sure if it was worth taking another course on the subject. I've already taken almost every structures class available (structural statics, structural dynamics, fracture...
  7. DeltaWing

    Advice for aspiring stress engineer?

    I'm finishing up a masters degree in AE, with the eventual goal of landing a job in aircraft stress engineering. The ME department here is offering a course called "Advanced Finite Element Analysis," but I am not sure if it is worth taking. From what I understand, it will cover the use of ANSYS...

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