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 Models
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Critical Speed Calculator
This model calculates the speed at which a vehicle will lose traction given the radius of a curve and the Coefficient of Friction of the roadway. This is usually called the 'Critical Speed'. |
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05/27/2008
11:38 PM
by: James R. Davis  |
James R. Davis |
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Lateral Acceleration & Lean Calculator
Given the radius of a turn and the speed of the motorcycle, this model calculates what the lateral acceleration and lean angle of the bike will be. |
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05/27/2008
11:34 PM
by: James R. Davis |
James R. Davis |
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Quadratic Equation Solver
Whenever you can reduce an equation so that it takes on the following standard form:
Ax2 + Bx + C = 0
then you can use the quadratic equation solver to solve it. Note, there are ALWAYS two correct solutions for x! |
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05/29/2008
5:18 PM
by: James R. Davis |
James R. Davis |
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Radius Calculator
This simple model allows you to calculate the radius of a curve given the length of a chord and its middle ordinate. |
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05/27/2008
8:54 PM
by: James R. Davis |
James R. Davis |
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Skid Distance To Stop
Sometimes you just want to calculate how long a skid mark will be given a starting speed, the Drag factor components, and the assumption that you come to a complete stop without falling over or colliding with something. |
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12/13/2009
10:09 AM
by: James R. Davis |
James R. Davis |
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Speed From Stopping Distance Calculator
Used to compute how fast a vehicle is traveling at the start of a known stopping distance. It assumes that all braking is done with a constant deceleration rate (such as would generally be the case if skidding). It also allows you to include PDR (Perception-Decision-Reaction) time, if any. |
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06/19/2008
9:58 AM
by: James R. Davis |
James R. Davis |
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Speed Scrubbed During Skid
It is not intuitive, but skid marks do not represent speed. Instead, they represent energy transformation. That is, they represent the amount of kinetic energy that was converted to heat. This model calculates the amount of speed that is scrubbed during a skid based on the starting speed and drag factors. |
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12/13/2009
11:27 AM
by: James R. Davis |
James R. Davis |
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Stopping Distance Calculator
This model calculates the fastest possible non-skid stop time and distance given Speed, Grade, Coefficient of Friction, and Braking Efficiency. It also calculates the maximum decelerate rate possible given the height of the CG, length of Wheelbase, and weight distribution. |
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02/02/2007
3:08 PM
by: James R. Davis |
James R. Davis |
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Vault Speed Calculator
This model will calculate the speed an object (such as a motorcyclist) is launch at (in other words, the motorcyclist's speed at time of impact) given you know how far it is thrown, the difference in height between launch point and impact point, and the launch angle. |
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06/18/2008
12:01 PM
by: James R. Davis |
James R. Davis |
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Lean Angle Calculator
This model will calculate the lean angle of the CG of your bike given Speed and Radius. Given the width of your front tire it will also calculate the actual lean angle of the bike. Finally, it will calculate the maximum cornering speed that is possible with your bike. |
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02/02/2007
3:43 PM
by: James R. Davis |
James R. Davis |
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Center of Gravity Calculator
This model calculates the location of your Center of Gravity given as input the measured results of lifting the rear wheel off the ground. |
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02/02/2007
3:35 PM
by: James R. Davis |
James R. Davis |
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Skid Mark Analyzer
This model calculates minimum speed at the time brakes were applied given the input of skid length, Coefficient of Friction, Grade, Braking efficiency, Collision speed (if any), surface moisture (if any), and Transient Braking Time. |
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02/02/2007
2:49 PM
by: James R. Davis |
James R. Davis |
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Speed Calculator
This simple model calculates your motorcycle speed given the rear tire radius, final gear ratio, and engine RPM. Note that though you have to input seven values with this model, if you merely combined this model with two others (Rear Wheel Radius, and Gearing) you wouldn't need to enter anything. |
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02/04/2007
2:23 PM
by: James R. Davis |
James R. Davis |
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Rear Wheel Radius Calculator
This simple model converts the specification of your rear tire into the radius of the rear wheel. (This is necessary in order to convert wheel RPM into motorcycle speed.) |
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02/03/2007
10:50 PM
by: James R. Davis |
James R. Davis |
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Horsepower Calculator
This simple model calculates your engine's horsepower given its RPM and Torque as input. |
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02/03/2007
11:26 AM
by: James R. Davis |
James R. Davis |
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Gearing Calculator
This model computes the final gear and final drive ratios given the gear tooth counts for Primary Drive, 1st through 6th, and Final Drive as input. |
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02/03/2007
11:18 AM
by: James R. Davis |
James R. Davis |
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Drag and Lift Calculator
This model calculates the weight on the front and rear tires resulting from virtually all variables that could affect them in a dynamic state. In particular, you will provide static state configuration information then add such variables as Latitude, Altitude, Wind speed, and Temperature. |
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02/02/2007
3:20 PM
by: James R. Davis |
James R. Davis |
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