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Posted By: fostertomsuper-lightweighting via carbon fibre etc, which has square-law effect on energy required.
Indeed - power-of-perhaps-two-and-a-half effect, because with lower power, 4WD motor-in-wheel + regen braking becomes feasible, eliminating engine bay, gearbox/diff, driveshafts, the volume and weight of all those hence lighter body ...
Posted By: mike7Can you explain that?OK I don't know whether lightweighting has exactly square-law or power-of-two-and-a-half-law effect, but certainly much better than linear (power-of-1-law) effect. Body lightweihting enables smaller lighter powertrain, which enables yet lighter smaller body, which enables the major eliminations described above, which enable radically smaller lighter body etc, perhaps not ad infinitum but certainly to a Sinclair C5 level.
Posted By: ringiDon't expect me to use a very lightweight car if there is any risk of a normal car driving into it!
Posted By: djhPosted By: ringiDon't expect me to use a very lightweight car if there is any risk of a normal car driving into it!
That's a common misconception. It's the strength that matters more than the weight.
Posted By: fostertomOK I don't know whether lightweighting has exactly square-law or power-of-two-and-a-half-law effect, but certainly much better than linear (power-of-1-law) effect.I doubt it's that simple. Low mass helps for start-stop driving without regenerative braking. Low weight helps for reduced rolling resistance but that's most significant at low speed. For higher-speed cruising the dominant consideration is aerodynamic drag where it's shape that matters, not mass and weight.