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  1. Rufus182

    Golf ball vs. race car

    I think the point is that aeroplanes/F1 cars have an efficient shape and hence getting laminar flow with min separation over the body is the goal. Golf balls are spheres and have a unefficient shape. Dimples can make a golf ball travel upto twice the distance! Speed skiers and cyclists employ...
  2. Rufus182

    Golf ball vs. race car

    I had the same thought about "dimple technology" in the bath the other day. Maybe there's some active patent/copyright on golf balls which is why this method has not emerged in other products, like motorcycle helmets for example? Maybe an aero expert could explain to us why dimples can only...
  3. Rufus182

    What Level of Theretical Knowledge do FEA Analysists Need?

    Rapt this is for you We've built a large number of flat slab structures based on linear FE model output using a reduced E value based on a cracking moment type relationship. This is in an attempt to determine a realistic long term deflection (& creep) behaviour. As a moment plot will tell you...
  4. Rufus182

    Concrete friction coefficients

    Thanks for the good advice & tips dudes. We are down a tunnel at the moment so yes, moisture is a condition. The bits were cast separately. We'll go for the side of caution: 0.3 will do for now. Watch your six Rufus182
  5. Rufus182

    Concrete friction coefficients

    Does anyone happen to know what the static coefficient of friction for concrete on concrete is? Approximately?
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