Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: bp@www.zefox.net
Newsgroups: rec.crafts.metalworking
Subject: Re: Batteries - EV Conversion
Date: Tue, 4 Mar 2025 02:10:17 -0000 (UTC)
Organization: A noiseless patient Spider
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Bob La Londe <none@none.com99> wrote:
> On 3/3/2025 5:37 PM, bp@www.zefox.net wrote:
>> Bob La Londe <none@none.com99> wrote:
>>> On 3/2/2025 8:02 AM, bp@www.zefox.net wrote:
>>>> As you observed elsewhere, batteries are a more fundamental problem.
>>>> At energy/power densities approaching hydrocarbon fuels they take on
>>>> the character of rocket propellants.
>>>
>>> So, hydrogen is the answer, and Elon was wrong?
>> 
>> Not sure what you're referring to. Can you elaborate?
>> 
>> bob prohaska
> 
> 
> Rocket fuel of course.  You brought it up.
> 
> 
> There is an old video clip where somebody asked Musk about hydrogen vs 
> electric, he replied electric no doubt.  I was just trying to find that 
> clip and post it for you, and only found dozens of videos from people 
> claiming Tesla is going to pivot to hydrogen fuel cells.

Ah. As rocket fuel, hydrogen is tops until you have to store it. 
As electric vehicle fuel you have to store it, then turn it into
electricity, which is also difficult/expensive/lossy. 

For rockets hydrogen is losing favor to methane, which
is easier to store, even if the specific impulse is smaller. 

In fact, if one wanted to build a low-emission truck
the use of methane, either compressed or liquefied, makes
a great deal of sense. That tech is already commercial. 
And, methane is cheap. 

bob prohaska