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#81
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#82
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Bibendum ... could not agree more.
I loved my E39 M5. The X5M is better. The soon to be M5 may be better yet, though I like the view from up here, and I'm going fast enough! K
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#83
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The gravitation pull between the object and earth is not however constant but is dependent on the mass of the object (as it is also dependent on the mass of the earth). |
#84
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Not sure why the gravitational pull matters here. Mass cancels back out of the acceleration formulae. Now, how about we put these X5 puppies on a ramp up to that cliff edge so that we can do some projectile calculations and see how far they can go before they impact? And will 98 RON fuel make the X5M go farther? And most importantly, will the PDC alert the driver to impending impact if the driver turns it on mid-flight?
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#85
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Think about this. Two objects. One is a large and very fine bird feather. The other is a moulding of that same feather made from lead. Same shape, same cross-sectional area, same cd. When you drop them together from a good height which will hit the ground first?
Hopefully the link below works. If gives a formula for terminal velocity. Shows how mass and therefore gravitational pull is a factor. Terminal velocity - Wikipedia, the free encyclopedia Last edited by Fraser; 05-01-2010 at 12:51 AM. |
#86
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While I understand the concept of terminal velocity, I am not sure I understand the relevance in a discussion of the falling speeds of different versions of the X5. Are you saying that the E53 is a feather? Or that the E70 is a lead sled?
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#87
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Regardless of X5s of any variety falling off cliffs, mass plays a part in the terminal velocity of a free-falling object.
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#88
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Using published figures for the X5M (2380 kg, frontal area of 2.9 sq m, drag coefficient of 0.38, and assuming the density of air to be 1.2 kg/cubic meter), I calculated a terminal velocity for the X5M (falling headlights first) of 188 m/s, or 420 miles per hour. I am not sure how high this cliff is, but it must be one hell of a drop for the terminal velocity to be a factor.
(Sorry Weasel, but I ignored buoyancy effects). Hey, it's a slow night. Bottom line? MFL101 was right, the X5M is fast, and even faster if dropped off a very high cliff. Corrections are most welcome from those engineers or aerodynamicists who took this more recently than 30 years ago, or who just remember it better.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#89
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Nice argument JCL but you are avoiding the key question; ie does weight play a part in free-fall. You have argued for the negative for reasons I can't understand. You know better than that.
PS: The cliff is high, very high. |
#90
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PS: How high does the cliff have to be for the X5M to reach terminal velocity?
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue Last edited by JCL; 05-01-2010 at 03:40 AM. |
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