Ramp Clearance Spreadsheet for Race Ramps
06-22-2011, 01:32 PM
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Ground Clearance Spreadsheet for Race Ramps
Here's a spreadsheet that will help determine which ramp a particular car can climb without scraping. The spreadsheet graphs the path of the nose of the car against the shape of the ramp. There are four ramps included in the spreadsheet.
1) RLL-89-2 Progressive Incline Race Ramps with 4 to 8 degree incline.
2) RLL-87-2 Two-Stage Incline Race Ramps with 6.8 and 10.7 degree incline.
3) RLL-72-2 Two-Stage Incline Race Ramps with 6.8 and 10.7 degree incline.
4) RR-XT-2 Standard 67" Race Ramps with constant 10.7 degree incline.
There are three values in green cells that can be changed.
1) Overhang length. This is the distance from the front axle to the furthest point forward in the 14" wide path of the tires. This is NOT the distance from the edge of the front tire footprint to the furthest point forward.
2) Wheelbase.
3) Overhang height. This is the height at the same point as #1 when the car is on the ground.
Changing these values will update all four graphs at the same time. If the red line (path of car) is higher than the blue line (shape of ramp), then the car will clear the ramps. You can scan the yellow row of data points for each ramp to get a better idea of how much clearance you have with a particular ramp.
There are a lot of factors which could affect the results, tire pressure, passengers in car, slope of ground, etc. A good rule of thumb would be to choose a ramp that offers 1/2" clearance minimum at any point along the ramp.
If you have an air dam on the car, you can run a separate calculation for the air dam overhang length and height.
The attached graph is a sample of the output from the spreadsheet.
1) RLL-89-2 Progressive Incline Race Ramps with 4 to 8 degree incline.
2) RLL-87-2 Two-Stage Incline Race Ramps with 6.8 and 10.7 degree incline.
3) RLL-72-2 Two-Stage Incline Race Ramps with 6.8 and 10.7 degree incline.
4) RR-XT-2 Standard 67" Race Ramps with constant 10.7 degree incline.
There are three values in green cells that can be changed.
1) Overhang length. This is the distance from the front axle to the furthest point forward in the 14" wide path of the tires. This is NOT the distance from the edge of the front tire footprint to the furthest point forward.
2) Wheelbase.
3) Overhang height. This is the height at the same point as #1 when the car is on the ground.
Changing these values will update all four graphs at the same time. If the red line (path of car) is higher than the blue line (shape of ramp), then the car will clear the ramps. You can scan the yellow row of data points for each ramp to get a better idea of how much clearance you have with a particular ramp.
There are a lot of factors which could affect the results, tire pressure, passengers in car, slope of ground, etc. A good rule of thumb would be to choose a ramp that offers 1/2" clearance minimum at any point along the ramp.
If you have an air dam on the car, you can run a separate calculation for the air dam overhang length and height.
The attached graph is a sample of the output from the spreadsheet.
Last edited by Fred@ReverseLogic; 06-22-2011 at 09:30 PM.
