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  1. Andries

    Can we PLEASE go back to the old forum!

    I agree with the objections; if it ain't broke don't fix it. Andries
  2. Andries

    WHAT IS THE CORRECT WAY OF PAVING MULITPLE LAYERS OF ASPHALT?

    Hi, I don't think that this forum is appropriate to your query; try road construction or similar, if there are such forums. Regards, Andries
  3. Andries

    Axial force of cone on two rollers

    I agree with LittleInch. Andries
  4. Andries

    A plane crash in Brazil, near Sao Paulo...

    Looks like the aircraft entered what is known as a deep stall; this occurs when the wings blank out the empennage, making the plane almost impossible to control. This occurs with T -tail aircraft and the result is usually a flat spin. The obvious question is why the aircraft went into a deep...
  5. Andries

    Building Collapse in South Africa

    South Africa building collapse now 26 deaths and about 30 still missing. This is a big can of worms.
  6. Andries

    This is just for fun...

    The company I worked for did maintenance of military aircraft. Something went wrong during the night and it was quite a sight next morning to see a row of jet fighters covered in foam with only the vertical stabilisers protruding. Andries
  7. Andries

    Why can't we use steel as wing instead of aluminum alloy

    The British Bristol 188 supersonic research aircraft of the late 1950s had a stainless steel airframe to deal with aerodynamic heating. Titanium was still in the future for aircraft. Andries
  8. Andries

    LOST : Anyone found an F-35 ?

    Is there a reward?........
  9. Andries

    FEA beginner help

    Hi aldomoul, As FEA way alluded to you must have a thorough grasp of basic mechanics of materials. Also read up on basic elasticity theory. You must be able to do rough "sanity" checks on your results using hand calculations on a simplified representation of the part in question. Another...
  10. Andries

    Test crashes...

    Pretty spectacular!
  11. Andries

    FE modeling of fuselage frames

    Thanks SAITAETGrad, I fortunately have Cook's book and copies of Taig's notes; they really get down to the nitty-gritty of FE modeling. (As far as FE text books go Cook et al is one of the best.) On further reflection and the replies above I can now understand the use of a single CQUAD4 as a...
  12. Andries

    FE modeling of fuselage frames

    Thanks Gentlemen, Yes, it is for a loads model. Regards, Andries
  13. Andries

    FE modeling of fuselage frames

    Good Day Colleagues, I noticed that in two different aircraft company finite element manuals the light frames typically used in airliner fuselages are represented by Nastran CRODS for the flanges of the stringer and a single QUAD4 element representing the web. Surely a single QUAD4 will be too...
  14. Andries

    The case for paperless office workflow

    Hi All, This thread is very interesting to me, a 77 year old museum piece. Yes, this surely the way to go. I suppose that you all have systems in place for archiving your calculations and keeping them up to date by configuration control (I'm from the aero industry where this is crucial)...
  15. Andries

    BETA ALIA-250c

    The idea of hundreds or even thousands of such aircraft (flying autos?)in the air, how on earth is this going to controlled? Road safety is bad enough, but this? Andries
  16. Andries

    DeHavilland Comet 1 Design

    Good Day. The Comet I fuselage skin was mainly from D.T.D.546B Aluminum alloy with thickness along the sides 0,036" and top and bottom 0,028". Frame spacing was 21" and stringer spacing 5,5"(average). Source: Aeronautical Research Council R & M No 3248: Behaviour of Skin Fatigue Cracks at the...
  17. Andries

    Time to move on?

    Gus, the fact that you are still employed while the company is going through a rough time means that they are satisfied with your contributions. I agree with TigerGuy that you should have a discussion with your boss, but keep things as positive as possible since he also has issues. All the best...
  18. Andries

    best tools - more used (useful) tools

    Hi Gibran, It all depends: In what area are you intending to work, e.g. airframes or aerodynamics? For airframe stress and structural analysis almost the industry standard finite element software is MSC Nastran, with Patran for model generation. Then there are packages for non-linear analyses...
  19. Andries

    ESKOM generator ka-boom

    ESKOM was once a well-managed organization run by highly qualified engineers. Most appointments nowadays are political and many, if not most, of the qualified personnel were retrenched in the past two decades. Andries
  20. Andries

    When should I tell my employer I am looking for other employment

    Also, try not to burn bridges, even if you feel bad about the company. You will be in the clear. Andries

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