>i was kidding when i said flying HICE cars were the future
I figured, but I was bored and wanted to explore the idea a bit myself.
>but even more importantly, if the energy doesn't come from a clean source, like renewable or nuclear energy, then the hydrogen fuel itself isn't clean.
Same for EVs. They're hellish on the environment producing the batteries, not to mention they go bad relatively fast as well. Either are currently poor environmental solutions. ICE isn't even much of an issue. It's mostly the big ass container ships causing the emissions. This is all another can of worms.
Either way, they both have a long way to go before they're a reasonable choice. And then they have to be used for years until they're actually affordable for everyone.
>ideal vehicle would be a hydrogen car with a wankel engine
For now. Assuming EVs do get developed to the point that they aren't totally useless in terms of performance, I think they would overtake the HICE. An issue with the wankel engine is that they are less fuel efficient and less torque. Torque on wankel engines is generally subpar. While the wankel engine produces an exceptional amount of horsepower, it won't have the same "get up and go" as a piston engine of comparable power. Wankels shine in races like Le Mans, where it just recently got unbanned. The long straight section allows that top end power to shine. You wouldn't see too much benefit from the lighter weight though, since I would guess that cars competing will hover around as close to the weight restrictions as they can, regardless of engine format. I suppose that weight could go to something else though.
EVs are more or less the opposite of the wankel. Relatively heavy, great acceleration, not great top speed.
Sorry if my post is all over the place. I wrote it during breaks at work.