That material is used because it flexes not because of cost. The fact it's cheaper is a bonus. I know that when the car was being tested at the beginning of this year different grades of aluminium and cf were tested.
(The CR2 chassis and motor plates were made from the same material as the C4.1)
Steve bent his chassis at the last Chadderton meeting because he hit a car flat out on the straight, if it would have been a b4 then the chassis properly would have broke IMO.
I had some pretty big crashes today and just kept a eye on my chassis using a steel rule and it's fine
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