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  • Users: Noor
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  1. Noor

    Electro-Chemical stripping of Chrome Plating

    Thanks for pointing that section out. The OEM process does call out for a bake after stripping; however, the note under Section 4.5.1 of MIL-STD-871B states that steel stripped with Solutions 5 or 6 do not require baking afterwards. It would be interesting to know if the bake called out in the...
  2. Noor

    Electro-Chemical stripping of Chrome Plating

    Hi all, I am looking at two processes specified for electro-chemical stripping of chrome plating from steel parts. One is from the parts OEM and the other is per MIL-STD-871. The two processes are very similar, except that the OEM uses a solution of sodium carbonate 6.5 oz/gal, while...
  3. Noor

    LN9037 Bolts

    Thanks, that is a great start.
  4. Noor

    LN9037 Bolts

    Hello, I am looking for a non-magnetic (stainless steel) substitute for a LN9037 metric bolt. This a German Aerospace specification, steel, hex head bolt used on many European aircraft (Diamond, Grob, Extra...). For North American aircraft, the situation would be replacing an AN3 steel bolt...
  5. Noor

    Location of pin support on beam

    rb1957, I know the drawing have much to be desired, but I didn't think they're that bad. There are three beam configurations represented there (the long rectangles). The triangles represent the pinned connections (the pin is at the vertex of the triangle). Also you're making assumptions about...
  6. Noor

    Location of pin support on beam

    Ok, I've attached a poor sketch to illustrate the problem. The construction of the beam is irrelavent at this point, because I'm working out the loads on the pin so that I can properly size it. The poor sketch shows three beams. The first beam has the pinned supports at the NA. The second...
  7. Noor

    Location of pin support on beam

    Yes, axial load due to the offset from the NA... that is a better description of the "horizontal shear". Thanks civilperson, that is what I was looking to confirm.
  8. Noor

    Location of pin support on beam

    Hello everyone, I'm looking at the design of beam that is pinned-pinned beam with a uniform load distribution. The beam is built-up from a thin web with two extrusions fastened to the upper and lower edges of the web to form the beam caps. The beam will be assembled to the rest of the...
  9. Noor

    Limit Loads & SCFs vs Ultimate Loads

    jetmaker, I understand your point about most aerospace matallic materials being "ultimate critical". If you were to design for no yielding at limit loads with a SCF=3 around a bolt hole, then you will find out very quickly that the this would be the critical design case... since SCF > 1.5...
  10. Noor

    Limit Loads & SCFs vs Ultimate Loads

    Thanks for the quick reply. That answer hit the nail right on the head. I agree that sizing to limit*kt is ultra conservative. I just needed to clear that up with a sound second opinion.
  11. Noor

    Limit Loads & SCFs vs Ultimate Loads

    Hello all, It is well known that the stress concentration factor at a hole in a tension coupon can reach 3 times the average stress, while the stresses are still within the linear elastic range for the material. When the material begins to plastically deform, then the stress field begins to...
  12. Noor

    maximum angle of aileron and rudder?

    The +/-90 degrees surface angle is often used in the specification of instrumentation to measure control surface positions. The measurements are used for flight control computers and flight data recorders. Although the measurement resolution is reduced, a good instrumentation system covers a...
  13. Noor

    AutoCAD Moment of Inertia Calculator

    Thanks for your help guys! I'm working with 2D drawings, and the only way I was able to get moments of inertia was to make a 3D model from them, and do massprops... however, now that IFRs showed me the missing "region" step, I'm all set! THANKS!!!
  14. Noor

    AutoCAD Moment of Inertia Calculator

    Hello everyone, I'm looking for a good (low-cost... prefereably no-cost) moment of inertia calculator routine for autocad. Does anyone know of one?
  15. Noor

    Looking for Wortman FX-66 H159 Airfoil coordinates

    Hello everyone, I have been asked to try and find coordinates for the airfoil subject above. I have found many versions of the FX-66 airfoil, but I cannot locate anything about the H159 variant. If anyone has any information about this airfoil, or knows where I can find it, please let me...
  16. Noor

    Area Moment of Inertia for Wood/Ply Spar

    I have access to a copy of Bruhn at work, so I will take a look at what you suggest... first I've heard of a Wagner Beam. Thanks for the lead Joe.
  17. Noor

    Area Moment of Inertia for Wood/Ply Spar

    Thanks robonave! You've obviously done this before, and your guidance is very valuable to me. I will take some time to digest all the information and see what I can do. If I have more questions for you, I will post again soon. Thanks very much!
  18. Noor

    Area Moment of Inertia for Wood/Ply Spar

    Thanks for the tips. The critically loaded section of spar is actually contsructed with additional spruce filler blocks between the upper and lower spar caps as well as 2mm ply doublers (web is 4mm ply) on the fron and rear face of the spar. If I assume the spar is contsructed entirely of...
  19. Noor

    Area Moment of Inertia for Wood/Ply Spar

    Hey Guys, I am in the process of doing a stress analysis on a wood wing spar with a composite construction of plywood web with four spruce spar caps. I'm finding out that the analysing structures built from wood is not as "trivial" as those made from metal. Perhaps some of you composite...
  20. Noor

    magnetic center of motor

    we are using ansaldo motor of following specification: 6.3 KV,493 rpm,129 amp,1MW power. the motor is using sleeve bearing with max. temperature of 75 C.The shaft of motor changes its position when we strart it i.e it comes out approx. 12mm when we start it (in discouple form).We call this...

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