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I'm wondering if you could make a composite sandwich (to save weight and cost)..inside and outside sheet aluminum, center piece of the plastic.............Might actually be stronger than equivalent weight of solid metal.... (or lighter for equivalent strength)
Simple physics for horizontal force is F=M*A, and falling force is F=M8G. If my math is correct a rig traveliong .5 mph would have an impact force of 2.933lbs, i.e. F=4000*0.73333333(.5mph in ft/second). However seeing how most trail impacts often from lurching, which could easily be 5mph, a plastic skid plate would have to stand up to at least 29,333lbs of force, or F=4000*5mph(7.3333333 ft/second).Dropping onto a rock would be F=4000*9.8m/s/s(32ft/s/s). A 4000lb rig dropping for a 1/10 of a second would have 12,800 lbs of force, i.e. F=4000*3.2(32ft/s/s*.1).
My number was for the energy that it would see . Also your math is alittle off. The time part is not the speed of the object but how long it is under the force. Its hard to explain. Think of it as catching a egg if you just hold your hand there and try there is no time. But if you move your hands as you catch to lessen the force you add time. That lessens the force on the egg and allows it not to break. \ I did say if it bounces back up. a ball hitting a wall will carry less force then a ball hitting a ball and rebounding back more. There are 2 different kinds of force.http://hyperphysics.phy-astr.gsu.edu/hbase/flobi.html#c1%22
I agree, I wheeled IFS for years without a skid plate. They are a waste of time and a complete poser product.
I wasn't attempting to correct you, my last physics class was over 23yrs ago, that is why I said simple physics. Had I been quicker w/my post it would have been posted before yours. I know you have to factor in either acceleration of the object being hit, or the object moving objects decelleration if it hits has more mass or is planted in a way that it wont move when being struck, but this makes a more complex equation for most of us(myself included) to understand. I like you was just trying to show that even at slow speeds, a 4000lbs rig is going to exert quie a lot of force on whatever it hits.
So i'm installing and 3inch lift in my IFS 4runner and i am trying to find out a good place to get a new skid. Is there any other Toyota skid that will fit or do i need to start looking for a shop to custom build me one.
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