From: none@none.com99   
      
   Don't get to bogged down in the basics. We know most of it. 4130 is   
   easier to weld than 4140, and maybe harder to heat treat. 1020 is easier   
   yet to weld, but lower tensile strength.   
      
   My son's engineering class (club?) is build a 4wd race cart for a big   
   competition. He has done the structural calculations with what he   
   considers a decent safety margin using 4130. Some years back I had a   
   chat with a local marine shop owner (Keith) who was building race carts   
   for his son at the local speedway for their 2wd youth cart racing class.   
   He said they were using 1020 DOM because it flexed more in hard racing.   
      
   Now there are some class differences. The cart my son's group is   
   building is using a specific nominal 14hp motor and using a full 4x4   
   drive train. The Keith's son was racing nominal 6.5hp Subaru Robin   
   clones like the Predator 212.   
      
   I'm not sure what my question is. I'm just trying to wrap my head around   
   it as "not an engineer."   
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)