Quote:
Originally Posted by v67gsr
Your pizza example does not resemble what is happening to the mounting location. Do some study before you start arguing. I am no engineer but I do know a bit about aero because I paid a lot of attention in this topic in the past 7 years. I hate to say this but the way you do your aero resemble a lot of ricer and time attack wannbe. Do yourself a favor, redesign it, don’t be a joke and a ticking time bomb moving around town. Last thing we want is someone head got chopped off because you refused to accept some basic physic.
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Oh, my apologies I didn't mean to offend you. Although I don't think we were really arguing since I approached you with a question - which is still left unanswered by the way.
Will the wing hold up the 80 pizza load or not?
I spoke to the driver and he said that he used three 5/16" Grade 8 SAE bolts on each side of the stand. I did some quick calculations and using a safety factor of two, each of those bolts can withstand 3490lbf. Combined strength of 10,470lbf to shear all 3 at once, but of course in reality the bolt closest to the front of the car should shear first.
I would be surprised if his wing is really making that much downforce to create that much force in single shear loads even with a moment about the furthest mounting point. I'm curious if you see something wrong with this calculation. I could provide you with an FEA simulation if needed to show you how I have simulated his wing. It was really bothering me that you seemed alarmed that his wing would fly off so I had to be sure this wouldn't be the case if we ran at the same trackday. Safety first!
The driver did have one comment to make though which was that the car attended the track day and drove home perfectly fine with the wing still attached. The driver also couldn't say the same for you making it home in one piece either though:
After the Driver sent me the photo I noticed that the wing was mounted to the trunk and not chassis mounted either, isn't that more double fail than his setup?!
