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-   ALL COBRA TALK (http://www.clubcobra.com/forums/all-cobra-talk/)
-   -   Original 4 inch vs. Billet Poll (http://www.clubcobra.com/forums/all-cobra-talk/88170-original-4-inch-vs-billet-poll.html)

fostereast 06-16-2008 07:45 AM
FEA is a great tool
 
For David K.

Out of curiosity, do you strain guage any of your designs and stress them in a way that let's you compare actual results to your FEA results. It would be fun to see pictures of copper wire and strain guages all over one of your test-bed cars.

I suspect that as you push the envelope into more and more billet items with weight reduction as a key goal that there are certainly a few parts or connections that would be fun and valuable to test this way.

David Kirkham 06-16-2008 10:59 AM
Quote:
Originally Posted by COBRANIP (Post 851167)
David,
Won't the billet frame (especially with pushrod suspension) result in a higher center of gravity (relative to the tube frame)? If so any idea how much difference?
Thanks for expanding all our horizons.

John
I imagine the CG will move slightly up from a frame stand point. How much??? Not sure--probably not enough to notice any difference.

We also moved the engine back quite a bit so that will certainly help. I guess we could do the calculations as we do have everything in CAD. Also, we can get the front to rear CG when we scale the car.

David
:):):)

David Kirkham 06-16-2008 11:31 AM
Quote:
Originally Posted by Ronbo (Post 851949)
That's a tough one, time on the computer to take more pounds off, however it has the reverse effect on the programmer.

Here's a tip: keep all snacks out of reach of the desk, preferrably on the opposite end of the building.;)

Personally, I judge how tough a project was by how many pots of coffee and packs of smokes it takes to complete it...;)
Good thing I don't smoke or I'd owe stock in Marlboro by now!

David
:):):)

David Kirkham 06-16-2008 11:36 AM
Quote:
Originally Posted by fostereast (Post 852318)
For David K.

Out of curiosity, do you strain guage any of your designs and stress them in a way that let's you compare actual results to your FEA results. It would be fun to see pictures of copper wire and strain guages all over one of your test-bed cars.

I suspect that as you push the envelope into more and more billet items with weight reduction as a key goal that there are certainly a few parts or connections that would be fun and valuable to test this way.
Now, that would be cool to see all those wires. As for that extensive of testing, no, the testing alone would be hundreds of thousands of dollars. But, we are doing the next best thing. This Thursday (hopefully!) we will be actually testing the car at the track with miles and miles and miles of hard driving. We will then take the car apart and check everything out to make sure FEA does correspond to real life.

As for testing, we do have a wall full of parts that are tested to failure. Some ideas are surprisingly good--others need more time on the drawing board. As for margin of safety, there is a reason we call Thomas "Baja Man." :LOL:

David
:):):)

Dominik 09-01-2008 12:03 AM
new body?
 
Hi David,

I prefer the original chassis & suspension for originality reasons, and registration in Europe.
How about a new body, see pm.

Dominik, currently in Gemany

joey_hv 09-01-2008 01:58 PM
How about selling the solidworks files for the CNC chassis, for those do-it yerselffers out there?

Cobra Lite 12-09-2009 12:57 PM
Old thread bump
 
I just found this old poll thread and read through all 9 pages.
Very interesting viewpoints expressed and many questions asked.

Now that the Billet car has been completed, driven, and viewed by many, I wonder if the poll is up to date?

I can see the reasons for each version on the poll. It is just a personal preference of what each of us want in a special car.
I see there is a market for each type.

My preference is for the best handling, best brakes, lightest weight car that looks and sounds like 1964. I would be quite content with a steel spaceframe design with the the billet rocker suspension since most of the billet frame is hidden anyway. The round tube (or square, etc.) ladder frame in any size is my least favorite both in design and appearance. I would really like a modern frame that drops the seats lower. Much lower! And offers modern adjustable suspension.

I think it is similar to hot rods and restored cars. Both have their place and both have die-hard fans.
There is a place for an "as-original-as-possible" as well as the most modern interpretation.

To paraphrase: "Build them, and we will come"
To buy them of course!


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