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LSP_Ray

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LSP_Ray last won the day on May 11

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About LSP_Ray

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  • Birthday 05/15/1959

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  1. LSP_Ray

    NATO"s LanceR

    Love the build! Did anyone mention you can follow along in 1/32 as Icaerodesign also offers a conversion set in our scale? It is available from RB Productions. Can't wait to see it finished!
  2. Nick, I have AIM's set sans tube and, yes, instructions give layout and dimensions for creating the bracing. Very complete, though the template will really help. Look forward to the new resin tube, John!
  3. Arrggghhh! I was just planning on thinning my stash of 109G's!
  4. I think, if I understand the theory correctly, we are a little beyond WWII engineering. I think what that theory concerns is pretressing the membrane so it stays taught at higher stresses, allowing higher resistance with thinner materials and less weight. Think of fabric covered flaps where they stretch it tight. You don't usually see oilcanning on these surfaces unless the fabric is really stretched. The valleys a lot of models have are incorrect. For WWII, oil-canning happens when the skinning across the framework expands ( or the distance between frames for some reason shrinks) the sheet metal makes up for the difference by oil canning. If the sheeting gets over-stressed, by either racking or stretching of the framework due to high loads, it can reach the plastic limit of the sheet metal, causing it to stretch beyond the metal's ability to snap back to its original dimension. So when unloaded the sheet will show wrinkles or waves in one direction or the other, or possibly in a diagonal direction. They sort of touch on that in your theory, but they are talking about a pre-stressed situation which is different. Of course, my engineering background is structures, not aerodynamics.
  5. Please note that "stress" isn't just caused by flying. Stresses in metals is also caused by other factors including simple change in temperature. If a thin metal sheet spans any distance and is constrained from expansion/contraction, like being fixed to a structure, such as spars and other members of a wing, and the temperature gets warmer, the sheet metal will expand. If the structure doesn't expand at precisely the same rate (and it won't as other members will keep it from doing so), then something has to give. Since there is very little strength in sheet metal perpendicular to the surface, it pops up or down to allow the increase in dimension. It therefore could happen just because the plane was built at 40 deg, and it warmed to 80. Stress from flying loads on sheet metal are typically in tension or shear so stress marks will look different. The main structure is suppose to take the stresses in the perpendicular direction.
  6. No mermaid wouldn't bother me, but it better have sparkles, in the correct pattern if course!
  7. The metal could just as easily pop out as well as in. Just depends which way required less force. On a dead flat surface you should see a variation in the oil canning. If there is a slight curve, most times metal would go out with the curve.
  8. Great job, Brad!
  9. Vallejo is pretty fragile. It scratches off easy on plastic, too.
  10. Just got mine; They are SWEEEEET!!!! Nice going, Dave!
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