Quote:
Originally Posted by DGthe3
You don't need that much pressure for this. I'd guess that the air bag (exhaust bag?) has a contact area of 3, maybe 4 square feet. And it only has to hold about half the weight of the vehicle. So, 3.5 square feet = 500 square inches. For a 5000 lb SUV, it would have to lift about 2500 lbs. So thats only 5 pounds per square inch of pressure. Turbo chargers add several times that without much issue. But, if you're worried ... upgrade the exhaust system first with something thats a bit less restrictive. That would more or less counter the added back pressure of the bag.
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The top surface area is probably more around 6+ ft^2 if the entire top surface were to be touching the car directly, which it wouldn't but still. It looks like the cylinder is at least around 2 ft across which would leave a 6.28X ft^2 of area on the top surface assuming the "bubble" is cylindrical, which it looks like it is. That could just be the pic though. Also, the force vector of gravity is always downward, so you're holding considerably less than half the total weight once the car is at an angle like it is once the bag is fully inflated. The physics of it makes it a great invention, but for practical use I don't know if I would trust it for anything other than a tire change. I sure as hell would not be under that car with that thing holding it up. I guess if it did burst on you, at least you'd get a nice big wiff of CO to calm you down while you get crushed
