(Sep. 16, 2016 12:55 PM)vikrambeyblade Wrote: Can anyone tell me the role of rotational momentum in beyblades?
Rotational momentum increases the heavier a Beyblade is and the further that weight is from the center. It makes the Beyblade more resistant to slowing down, which is great for Stamina types, both for solo spin time and resisting loss of speed when you hit an opponent. For Attack, it's very important as well, because it determines how effectively the hit transfers to the opponent; if you're heavy with good weight distribution, you will lose relatively little speed after a hit, and will do much greater damage on those hits as well.
Having less rotational momentum can sometimes be useful, too; more momentum means you're harder to slow down, but it also means you're harder to speed up. Spin Stealers can make use of "bad" weight distribution to allow them to steal more spin more easily, at the cost of worse solo spin time. Less rotational momentum also makes it easier to reach higher RPMs on launch, making it useful for Attack types going for a one-hit KO due to the increased starting power.
Bursting is based on rotational momentum as well; the Disk contributes most of the Beyblade's mass, but the Layer is what takes hits. When the Layer is hit, the Disk + Driver portion of the Beyblade "wants" to continue spinning at the old speed, while the Layer is slowed down by the hit. The difference between the force on the Layer and the momentum of the rest of the Beyblade is what causes the Layer to turn relative to the Driver, causing Bursting. This is another case where intentionally using lighter or poorly-distributed parts may be actually useful; using heavier Layers or lighter Disks and Drivers will make it easier for the bottom half of the Beyblade to match the speed of the top half, improving Burst resistance at the cost of Stamina and probably KO Defense.