Subject	Ahh yes rotational inertia
Posted by	Obeeone on September 27, 2012 at 6:40 PM
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In Reply To	I tend to agree with you. posted by Antihero on September 27, 2012 at 01:15 PM
Message	For giggles. The moment of inertia is : I = (1/2) m r^2 for a simple disk h=0 Say mass is 20lbs Say radius is .8ft or a diameter of 20 inches (not sure exact dimensions of a TT flywheel) I = .5*20lb * (.8ft)^2 = 6.4lbft^2 Now say mass is 12lbs Same radius I = .5*12lbs * (.8ft)^2 = 3.8lbft^2 A difference of 2.6lbft^2 Now plug the difference into the the angular momentum equation L = Iw Assume w at 2000 rpm and lets see what change in angular momentum we have. L=(2.6lbft^2)(2000rpm)(2pi/1rev)(1/60s) = 544 lbft^2/s That's a considerable difference in the change in angular momentum, which is fair to say that people can probably feel the difference in engine response.
Follow Ups	doubt on the lightened flywheel performance increases - tian2bing 11:55:01 09/27/12 Answer here - s3trios 12:14:52 09/27/12 It doesn't inherently get you more power... - johnnysombrero 12:23:54 09/27/12 too much math - fuzzymonkey 12:56:26 09/27/12 For me, the best part was in how the engine responded - zellamay 13:14:28 09/27/12 I tend to agree with you. - Antihero 13:15:00 09/27/12 Ahh yes rotational inertia - Obeeone 18:40:41 09/27/12 Good, I was having trouble slee...Zzzzzzzzzzzzzzzzzzzzzzzzzz (n/m) - johnnysombrero 01:09:03 09/28/12 Nice! Finish up by make an equivalent HP comparison - OverZealous (CT) 16:02:47 09/29/12 Lightened flywheel performance considerations... - RaeCathode 13:48:31 09/27/12 Re: Lightened flywheel performance considerations... - tian2bing 18:05:39 09/27/12 Like Rae mentioned, you're focused on the wrong purpose. - TriniTT 14:18:40 09/27/12 oops (n/m) - aliaZ 15:28:59 09/27/12
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