Aluminium AC Cobra Chassis

[albanycobra]

If the RCR is so stiff why not publish test results....it could only sell you more cars? I'm not having a go or trying to start sht just wondering why the secret if it blows the competition away.

I have tested many chassis over the years and have a bit of an interest in Torsion testing, I am also interested in the CAV chassis. I built a test rig years ago that is still being used today to confirm torsional figures for Locosts / Cobra's and one off jobs. These days it uses a load cell instead of weights.

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The only way to measure Torsion is through the wheels.

FFR will not publish Torsion test figures, beats me......

DRB seems to be the only Manufacture that lays it all on the table for everyone to read and I applaud Peter Ransom for it......

[Jac Mac]

Originally Posted by albanycobra

If the RCR is so stiff why not publish test results....it could only sell you more cars? I'm not having a go or trying to start sht just wondering why the secret if it blows the competition away.

I have tested many chassis over the years and have a bit of an interest in Torsion testing, I am also interested in the CAV chassis. I built a test rig years ago that is still being used today to confirm torsional figures for Locosts / Cobra's and one off jobs. These days it uses a load cell instead of weights.

[/IMG]

The only way to measure Torsion is through the wheels.

FFR will not publish Torsion test figures, beats me......

DRB seems to be the only Manufacture that lays it all on the table for everyone to read and I applaud Peter Ransom for it......

Dave,
CAV claim 32000 NM/deg and have put out a report on that. I would point out that the test rig was bolted virtually flat plate style to front & rear of tub/mono & did not link thru suspension pickups as yours does so results are particular to their test rig, Just as yours are to your rig.

I would question your test rig in that the pivot point is below the chassis at front and therefore as you apply load that you are not going to get a true torsion only result. If you were to break down the chassis to simple form the lower plane of the chassis is simply being twisted as its at close to the pivot height, but the upper plane of the chassis is being subjected to a parallelogram type load. If you were to raise the front pivot point you might find you get even higher test results than your current readings as many chassis simply have heavier material in the lower frame rails which would now be subjected to the parallelogrm effect as well..

This is why most of these discussions go nowhere as data to be relevant needs to be collected from the same type test rig.