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David and Joe,
I'm a bad guesser and I have little time for this since it's 6:00 PM Maui time right now. I've got to back to the pool and play with the kids. Can you hurry it up? |
Naturally my friend. Don't worry, if I can protect Santa Claus' story in my house, I can protect anything.
Judging by the time of your posts tonight vs. last night, you guys wrapped up early today. Congrats. |
Maui?
Its 19* here in Provo. You do not deserve to know. Go back out and play with the kids. |
Lew,
We aren't wrapped up yet! It will be a long night. I have a special dish I have to get out oven. This is so cool...It's like my birthday! David :):):) |
It was a tough choice. Provo for Ski Week or Maui? My wife said Maui. It's about 80 here. Gorgeous.
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Oven.... ? Are you heat treating something or autoclaving carbon fiber ???? Or is it just a TV dinner? Robert
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Looks like a billet chassis.
Think F-22A wing. True Carbon Chassis /body. Monocoque. Million USD may not be enough. Carbon/carbon brakes. Real CV half-shafts. String cut. Billet wheels (Cobra II). Billet engine, Ceramic pistons, Cracked Ti rods, 9000RPM, 300Ci, pneumatic valves, 850HP 700kg |
Quote:
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Lew,
;) Bert, Just put the hubs in the oven. They come out looking like gold...about as expensive too! What'saCobra hits the nail right on the head! (But he cheated, he came out here and saw us sweating over it!) BILLET ALUMINUM CHASSIS! If you take billet far enough, you eventually just billet the chassis so you can get the suspension points where you want them. The 90 inch wheel base presented some real challenges. The structure is very similar to a wing with longerons. We will rivet sheet aluminum over the billet rails. Just for some fun information, we did an FEA (Finite Element Anaylsis) on the original 427 Cobra chassis and it had a stiffness of 1450 foot pounds/degree of deflection. The billet aluminum chassis we engineered has a stiffness of right at 4500 foot pounds/degree of deflection--or a 300% improvement over an original. Just for comparison, the thicker frame rails we use have a stiffness of 1650 foot pounds/degree of deflection--for an improvement of around 14% over an original chassis. Interestingly, even so low a figure as a 14% increase in stiffness is READILY noticeable as soon as you drive down the road. I can't wait to try a 300% increase in stiffness! Another point of comparison, a "Supercar" (like a McLaren F1) typically has a stiffness of 10,000 foot pounds/degree of deflection--but remember, they have a roof which is an enormous help. We were able to get the stiffness of the billet chassis so high because we used very tall door sils that we hid under the doors and spread them WAY apart. We also made a really cool billet aluminum bulkheads and a stressed tunnel to help transfer the loads. David :):):) I will post a picture soon. |
a few more hours
David,
Nice !! See you and the great Kirkham team in a few hours. Larry |
Kirkham Winter Summit
Kirkham Winter Summit spy photos.
http://www.clubcobra.com/photopost/d...88_Medium_.JPG http://www.clubcobra.com/photopost/d...86_Medium_.JPG http://www.clubcobra.com/photopost/d...87_Medium_.JPG http://www.clubcobra.com/photopost/d...85_Medium_.JPG http://www.clubcobra.com/photopost/d...84_Medium_.JPG http://www.clubcobra.com/photopost/d...82_Medium_.JPG |
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:drool::eek:
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Looks impressive! When you actually use it for normal driving, would it need to be x-rayed/dye penetration tested now and then to detect fatigue cracks (like airplane parts)?
-Simon |
Simon,
No, airplanes are made out of very hard (and crack prone) aluminum alloys. (Typically, 7075 and 2024). Additionally, airplanes are typically only made with a very small safety factor as an airplane has to fly and everyone knows it is very difficult and expensive to get extra weight (more safety) off the ground. Finally, airplanes can't just pull over on the side of the road when the crap hits the fan. On this car, we observed as strict of weight discipline as was reasonable. We used 14,000 psi as the endurance limit on the FEA (Finite Element Anaylsis) tests. (The aluminum doesn't yield until 30,000 psi.) The chassis should last forever. It is amazing the amount of material that can actually be removed when you run a part through FEA. It is extremely interesting to design a part and then run it through FEA. You think you are cool until Cosmos tells you otherwise. After the tests, it is amazing to see where the computer tells you you have too much material and when you think about the colors you wonder why you were so dumb in the first place. (We call FEA "looking for rainbows" as different stresses show up as different colors). What is really interesting is when you actually REMOVE material and make a part stronger by shifting the load paths around. As you can imagine, we were very concerned with keeping our customer happy and him off of You Tube. David :):):) |
David,
How about a one piece "Billet" aluminum body :D . Bill S. |
Guiness:
RE: Spy Photos, 3rd photo: Appears to be the hood and fenders of a Series I XK-E ? If so, any other info, such as reproducing the entire body ? One of my previous vehicles was a Series 1 1967 XK-E coupe, silver blue with the gold head. I do not know if they are still in business, installed an Abarth exhaust system, real neat sound with the Jag engine. |
Too nice to cover up with a body. Does anyone make a 427 S/C body in a clear material?
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It would look great with 15" magnesium wheels in 15X8 and 15X10.
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