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Old 20-11-2011
carpenterdean carpenterdean is offline
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Default C4.1 Chassis

Been to chadderton today and was told that some of the c4.1 chassis had bent how bad were they bent? and was it just through the jumps or was it due to a bad crash? either way surely this shouldn't be happening?
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Old 20-11-2011
andys andys is offline
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Hmmm.

Saw lots of people looking and analysing one and heard that Steve had to adjust his last time with a hammer !

Doesn't sound promising, anyone shed some light ?
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Old 20-11-2011
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nickhudson nickhudson is offline
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if the chassis is made from 5251-H22 aluminium and is unsupported between the steering bulkhead and the batteries then I wouldn't be at all surprised. if that material spec is correct (from the CML website - link below) then IMHO it's totally the wrong material....waaayyy too soft for the application. it is cheaper than 6082-T6 aluminium I suppose and is easier to bend (from a manufacturing point of view) but an incorrect material choice for this design.

http://www.cmldistribution.co.uk/new...iew=0000001811
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Old 20-11-2011
carpenterdean carpenterdean is offline
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So then my next question is if this is not a suitable material are cml going to send us all a chassis that is going to work properly?
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Old 20-11-2011
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nickhudson nickhudson is offline
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not my call. If it was me I'd be asking (a) where the chassis bent, (b) what the material spec is, (c) what were the conditions that caused the chassis to bend and (d) is this an isolated incident or a reoccurring problem.
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Old 20-11-2011
tony12795 tony12795 is offline
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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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Old 20-11-2011
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controlled flex is fine but staying bent is not - the material (if the spec is correct) is too soft IMO especially when the chassis is totally unsupported between the steering and the batteries. there is a reason why most chassis have some vertical webbing or support in that area.

the cr2 chassis was supported and braced with CF as far as I know.
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