If you can add mass close to the centre of gravity you will not increase the inertia as much as if the mass was added further away. A normal 2wd byggy with rear motor will have quite high yaw and pitch inertia and very low roll inertia. But a X6 will have lower yaw and pitch inertia and a higher roll inertia, (battery placed from side to side).
Another benefit could also be that it also lowers the centre of gravity if the CG is originally positioned higher than the weight added.
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Kyosho RB5 SP: RB5 Mid: ZX5 FS: Orion: Spektrum
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