Posted by MarkB_MI on June 23, 2016 at 03:09:38 from (70.194.4.136):
In Reply to: ramp posted by schrade on June 22, 2016 at 17:16:09:
You have two things to consider: How steep the ramp is and how much clearance you have when a vehicle goes over the peak. Obviously the lower the grade the better, but you probably don't have room to build an eighty foot long ramp, which would give you a nice five percent grade. So let's think about what's the steepest ramp you can have without having a vehicle high-center as it enters the building.
Let's assume you have a vehicle with 6 inches of ground clearance midway between its axles and a 140 inch wheelbase. The vehicle will high-center if it goes over the top of a ramp where the peak is 12 inches higher than a point on the ramp 70 inches from the peak. (We double the six inch ground clearance because the front wheels are on the shop floor. And of course 70 inches is half the 140 inch wheelbase.) So that means the ramp would have a grade of 12/70 = 0.17. So a four foot high ramp would be 4/.17 = 23.5 feet long. You can substitute the actual ground clearance and wheelbase numbers of your boss's vehicles to find the steepest grade his vehicles will be able to handle.
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