News for hackers. Stuff that matters.
Re:Keeping Rotary Alive: Mazda's Rotary Engine in the Age of... by markhahn on Saturday March 30, 2024 @11:16AM (#39875634)
I admire the idea of hubmotors as well, but once mentioned them to a car engineer, who basically said "think about unsprung weight".

Which, now that I think of it again, is a bit silly because most EV mass is battery, not motor.

Re:Keeping Rotary Alive: Mazda's Rotary Engine in the Age of... by zrobotics on Saturday March 30, 2024 @11:51AM (#39876007)
Shaving unapeung weight down, even by a small fraction of the total vehicle weight, will dramatically affect handling and perceived ride quality. Even though the battery makes an EV heavier than an equivalent ICE car, there is still the need to reduce unsprung weight. Thus, it would be better to have the motor inboard and run a cv axle out to the wheel than have the entire mass of the motor out on the wheel.
Re:Keeping Rotary Alive: Mazda's Rotary Engine in the Age of... by lelanthran on Saturday March 30, 2024 @02:18PM (#39877254)
Unsprung weight does not have a linear impact.

Increasing the unsprung weight by 10% causes a 100% deterioration in handling and ride quality.

You're suggesting increasing the unsprung weight by about 400%.

Re:Keeping Rotary Alive: Mazda's Rotary Engine in the Age of... by rootusrootus on Saturday March 30, 2024 @02:46PM (#39877506)
> once mentioned them to a car engineer .... now that I think of it again, is a bit silly

No offense, but this right here is peak HN.