ORIGINAL: powerlifter450
Rails aren't holding up from what I'm reading. Many brands go with plastic to cut costs. I think that HPI is good but that Caster Racing is better.
Not really to cut costs. In alot of cases plastic will flex (arms, and some suspension parts),and deflect the energy from impact, where aluminum will just transfer it to the weakest link and bend.
So which would you prefer do a jump, and bend a arm or break something expensive farther in, or have cheaper plastic parts that will warp to absorb the energy or in worst case scenario snap instead of transferring the energy from the impact to something that is harder to get to and probably costs more?
No clue on the rail though my post is just about RC's in general.