Quote:
Originally Posted by seifrob
As I said, it was back-of the envelope calculation without any tools. So I had to estimate height, width, drag coefficient and weight. That envelope in question (alright, it is back of IKEA leaflet in fact) is attached. I hope someone wiser (aerohead, kach22i??) will check it.
What I donīt know is drag coefficient of large diameter tube. Regardless of that, general solution (formula) is there, use your own numbers (in metric).
EDIT: I should explain: If a car flips or not is question of ?moment? - i donīt know correct term in english. When flipping, you have two levers. One is weight of your car acting on half of your wheelspan, pinning you to ground, the other is aerodynamic force acting on lever as long as half of height of your car (approximately). When aerodynamic force multiplied by the lever length is greater than weight multiplied by half of the width, you are in trouble.
It would be much easier to explain it i my native language. (but much harder for you to understand :-) )
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Thank you for the explanation. I found this from
https://en.wikipedia.org/wiki/Tesla_Model_S :
"Most notably, since the battery pack is the single heaviest component of the vehicle, the Model S has a center of gravity height of only 18 inches (46 cm)".
So center of gravity is 18 inches (46cm) on the car which weighs 4842 pounds (2196kg). The Model S is 56.5 inches (143cm) height. The entire camper structure is 300 pounds (136kg) at 8-foot diameter by 20-feet long. I calculated that for 3 layers of carbon fiber, then 1-inch layer of nomex honeycomb, and another 3 layers of carbon fiber.
My roommate is an engineer so I'll ask him for help too.