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Rotational drag has very little effect

Jul 22, 2009 at 7:43 PM


I have a rectangular body 80x80 with mass 1 spinning at an angular velocity of 4. Even if I set the RotationalDragCoefficient as high as 1, there is no visible reduction in velocity. In 5 seconds, the body's angular velocity reduced to 3.93. With a RotationalDragCoefficient of 10, the velocity reduced to 3.4 in 5 seconds. Is this expected? Given that the default rotational drag is 0.001, I would've thought that multiplying it by 1000 or 10000 would be more that enough to get a significant effect.

Jul 22, 2009 at 8:14 PM

Simply set it higher. The demo here: (requires Silverlight) has a RotationalDragCoefficient value of 100.

Jul 22, 2009 at 8:55 PM

Yes, it looks like that works. I was just uncertain since I had to make it between 2,000 and 5,000 in order to get the drag I wanted.