light weight flywheels will allow the engine to rev quicker but the revs will also fall quicker. as in the engine could bog when up shift from the engine not having enough rotating mass to keep the motor at the optimium rev for smoth shifting
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if you havent been in a small plane its worst, cause your eyes and brain say we are moving and your body says oh no we are not. eyes and brain go asshole we are moving, cant you see? body says fuck you we are not moving at all. so they fight and fight and eventualy your body says, you know what fuck you brain, see if you can stop this!! then you throw up.