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AdrenalineJunky said:
Does anyone have some numbers for torsional and bending rigidity properties between C5 family... (coupe, convertible, FRC)?
From an article on the 2001 Z06, it states that "the fixed roof and lack of the big hole in the back for the coupes hatch make the hardtop 12% stiffer in torsion than a coupe with its roof in place.And for the rocket scientists out there,Torsional frequency is 20hz for the convertible,Coupe with the roof panel out is 20.5, and jumps up to 22hz with the roof on. The Z06 is a stout 24hz."
 

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Baron said:
And for the rocket scientists out there,...
:lol:

You don't have to be a rocket scientist to think that's funny! :cheers:
 

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From recollection the Aluminum frame C6 Z06 ALONE has a regidity of around 21.5 Hz. It is very close to the steel frame due to hydroforming, extra gussetts, stiffer tunnel close-out panel and very stiff and welded spring/shock/suspension attatchment boxes.

The key is the roof panel. With it attatched the Aluminum frame is about 23.8 Hz....which is comparable to the steel frame but much lighter.

Since the final harmonics are close between the steel and Aluminum frame some convertible nuts originally thought they could dissconnect the top panel and mod into a Targa or convertible wiithout much trouble. This is NOT the case because without the top the Aluminum frame looses too much and needs quite a bit of additional reinforcement stiffness and added weight.
 

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Thank you. I always suspected that the aluminum frame was not quite as rigid as the steel, despite the increased thickness of the aluminum frame and (as you pointed out) the top panel and other reinforcement components. It's still very close though. And light-weight of course.

However, I am a little surprised that a C6Z targa conversion would have a significant impact on rigidity. It doesn't seen to have a large affect in the C5Z from what I have heard. Now, chopping off the entire roof in either car, yeah, that would make a bigger difference.
 
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