>If automakers were that serious about drag reduction, we’d see many more EVs riding on smaller wheels.
Has nothing to do with drag. EVs are heavy, and need big brakes to stop in an emergency. Wheels go over the brakes. Therefore, the wheels need to be big to fit the brakes. Smaller wheels mean longer braking distances. Nobody wants that.
EVs rarely use brakes, and larger wheels reduce the efficiency of regen braking. But we are optimizing for the worst case where braking is needed, so a larger wheels reduce size is useful.
You physically can't fit smaller wheels on the car and pass safety tests. A 14" wheel on a Tesla or Kia EV means downsizing the brake rotor and caliper to an unsafe stopping distance.
I just find them so unnecessary. If you need them for fuel efficiency, is your battery / motor / whatever really properly designed? It just comes off as desperate.
> The flush Hyundai and Kia handles are motorized and retractable, but they can also be opened entirely mechanically without power. They are little more awkward to use when unpowered but it's entirely doable if you know how. You just push the front side in which pops out the rear grab handle part. This also how Chevy has done their Equinox EV handles which is powered on the higher trims but unpowered for the base model I believe.
So, as long as they fail safe, I think they’re fine from a form and function perspective. It’s the failing unsafely (Tesla) that’s the problem. If they do not work without power, they should fail safety testing.
I largely agree, although in an emergency bystanders/emergency workers shouldn't be trying to figure out how a door handle works at all. As a general non-driver, I find it kinda disturbing how auto manufacturers are constantly making these cosmetic adjust that impact safety - excessively bright headlights, distracting animated turn signals, weird ass handles. Not all features are innovations, some are just bad ideas.
That’s fair. I would also support pyrotechnic bolts or other systems similar to seat belt tensioners that cause doors to fail open upon impact. The primitives already exist to support isolating the high voltage battery pack in a crash event (triggered by airbag deployment) using a pyrotechnic switch. When Bad Thing happens, the vehicle should be designed to maximize occupant survival odds, including minimizing time to occupant extraction.
The fuel efficiency claims are nonsense. Golf balls would like to have a word with these engineers.
They do it because it looks cool and futuristic. Just like replacing all of the physical switches with non-tactile touch-based things. Overall just reduces the vehicle's safety and increases the cost to repair. Door handles, by law should be mandated to be physical things. If you want a button that can automatically actuate the physical linkage that's fine but the handle itself should be a physical linkage to the latch.
>If automakers were that serious about drag reduction, we’d see many more EVs riding on smaller wheels.
Has nothing to do with drag. EVs are heavy, and need big brakes to stop in an emergency. Wheels go over the brakes. Therefore, the wheels need to be big to fit the brakes. Smaller wheels mean longer braking distances. Nobody wants that.
EVs rarely use brakes, and larger wheels reduce the efficiency of regen braking. But we are optimizing for the worst case where braking is needed, so a larger wheels reduce size is useful.
You physically can't fit smaller wheels on the car and pass safety tests. A 14" wheel on a Tesla or Kia EV means downsizing the brake rotor and caliper to an unsafe stopping distance.
I just find them so unnecessary. If you need them for fuel efficiency, is your battery / motor / whatever really properly designed? It just comes off as desperate.
From a comment:
> The flush Hyundai and Kia handles are motorized and retractable, but they can also be opened entirely mechanically without power. They are little more awkward to use when unpowered but it's entirely doable if you know how. You just push the front side in which pops out the rear grab handle part. This also how Chevy has done their Equinox EV handles which is powered on the higher trims but unpowered for the base model I believe.
So, as long as they fail safe, I think they’re fine from a form and function perspective. It’s the failing unsafely (Tesla) that’s the problem. If they do not work without power, they should fail safety testing.
I largely agree, although in an emergency bystanders/emergency workers shouldn't be trying to figure out how a door handle works at all. As a general non-driver, I find it kinda disturbing how auto manufacturers are constantly making these cosmetic adjust that impact safety - excessively bright headlights, distracting animated turn signals, weird ass handles. Not all features are innovations, some are just bad ideas.
That’s fair. I would also support pyrotechnic bolts or other systems similar to seat belt tensioners that cause doors to fail open upon impact. The primitives already exist to support isolating the high voltage battery pack in a crash event (triggered by airbag deployment) using a pyrotechnic switch. When Bad Thing happens, the vehicle should be designed to maximize occupant survival odds, including minimizing time to occupant extraction.
https://xray.greyb.com/ev-battery/tesla-crash-protection-tec...
The fuel efficiency claims are nonsense. Golf balls would like to have a word with these engineers.
They do it because it looks cool and futuristic. Just like replacing all of the physical switches with non-tactile touch-based things. Overall just reduces the vehicle's safety and increases the cost to repair. Door handles, by law should be mandated to be physical things. If you want a button that can automatically actuate the physical linkage that's fine but the handle itself should be a physical linkage to the latch.