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Re: pic: Prototype Drivetrain
I'm sorry, I should have been more explicit, my brain is not 100% in this caffeine-free day 
3/4"x0.35" square 4130 steel tubing would roughly maintain the weight of a 1"x0.065" aluminum square tube. The benefit is that 4130 steel still has a YS of around 70-80KSI when welded, whereas welded 6061 aluminum will be total garbage, around 8-10KSI. With further optimization a far more efficient chassis is possible if you use welded 4130 vs welded 6061 because the yield-strength:density ratio is roughly five times higher with welded 4130 compared to welded 6061.
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Theory is a nice place, I'd like to go there one day, I hear everything works there.
Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
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