The below linked video is about a fraudulent attempt by Victor Ninov to claim success at making 116 and 118, but explains the experiments, I think, quite well.
Amazon will accept returns, but not like Costco will or sears did.
Sears would exchange any broken craftsman tool for a new one even decades after purchase. Costco is much the same. Used, year old stuff with missing parts will gladly be refunded in full.
To be fair to Costco you have to understand that the way they do that is they just send the item back to the vendor and deduct it from the next purchase. The vendors only option is to not sell stuff to Costco anymore.
Have these gotten mature enough to actually use? A few years ago, every single one I tested would just give you a different voltage if it couldn't trigger the correct voltage, which is obviously terrible.
With regeneration you do have a desire to have power coming in from the wheels so a hard disconnect isn't desirable in all circumstances.
I know, by observation, on my Prius that "panic stop" brake pressure disconnects the hybrid system due to all the noise that the contactors make when this happens, vs. lighter braking within the regeneration limits. Braking and power never ever fight one another though. I've tried "power braking" the Prius, like you can with a normal automatic transmission car to load the engine, and it just doesn't do anything at all.
This article about the physically stuck pedals says that "Thankfully the truck cuts acceleration when you press the brake pedal..." but this seems to show otherwise.
Edison Motors has built diesel-electric truck that operates essentially like a diesel-electric locomotive. Last I read it got whatever certifications are needed and is now 100% street legal. They intend to also build retrofits for existing semi trucks.
In vertical stacks surface tension makes flowing water cling to the perimeter of the pipe. The supply can then be coaxial like I think you are saying.
This is one product (linked below) like this although I think plastic would be fine if a little less thermal conductivity and less expensive than this much copper.
If you recover heat to the cold supply then you need less hot supply to get to the same outlet temperature. If you have an updated fixture with a thermostatic mixing valve then I think this would track pretty much seamlessly, but I've not ever had the opportunity to use a shower equipped this way.
Damping is restraining oscillation.
Dampening is making something wet.