XPost: alt.home.repair, rec.autos.tech   
   From: @.   
      
   Scott Lurndal wrote on 1/19/2023 5:04 PM:   
   > =?UTF-8?B?TWlnaHR54pyFIFdhbm5hYmXinIU=?= <@.> writes:   
   >> Rod Speed wrote on 1/19/2023 3:41 PM:   
   >>> David Lesher  wrote   
   >>>   
   >>>> You want the spark when disconnecting to be AWAY from the   
   >>>> rapidly charging battery.   
   >>> There is no hydrogen when the once flat battery   
   >>> is being charged once the engine has started.   
   >>>   
   >>>> So: Run the negative from frame to frame,   
   >>>> and disconnect at the rescue car first.   
   >>   
   >> I real life scenario there is no danger of hydrogen accumulation under   
   >> the hood because it is too airy inside the engine compartment.   
   >>   
   >> There will be danger of hydrogen accumulation if the lead-acid battery   
   >> is confined inside a box, like underneath a motorized wheelchair.   
   > Then why do space launch vehicles use burners to ensure that any H2   
   > that pools around the launch site is burned off before launch?   
      
      
   Have you actually seen a rocket launch? The launch rocket itself is a   
   gigantic blowtorch which would have blown away or ignited "any H2 that   
   pools around the launch site". Besides, H2 doesn't "poll around the   
   launch site" because hydrogen is much lighter than air. Any leaked H2   
   would have risen up into the heavens.   
      
      
      
   > Far more "airy" environment than any automobile engine compartment.   
      
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