For example, a motorcycle and rider weight 590 lbs. and collides into a brick wall at 35 MPH. The amount of Kinetic energy that exists is 32,758 joules. That's enough energy to move an object weighing 24,161 lbs. a foot. You read that right ... That impact creates enough energy to move a 12 TON object one foot. (From different perspectives, it is slightly more than 31 BTU, or 7,824 calories.)

By the way, it's the same energy that would be created by a 590 lb. object falling 41 feet.

Any wonder why a 35 MPH crash can be fatal?]]>

For example, a person falls 40 feet (about 4 floors).

Or,

A student in a Rider's Edge class pops the clutch on her Buell Blast while she has applied a 1/4 throttle (and we assume that the bike generates 0.4g's of acceleration), given that there is a concrete lamp pole in her path 40 feet from where she starts (and she does nothing to avoid the collision).

Or,

A person is startled when a deer jumps into his path 40 feet in front of him when he is riding at 30 MPH and he mistakenly gives the throttle a quarter turn on (assuming his bike can generate a 0.4g rate of acceleration).

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Given that a bike and rider have a mass of 1,000 lbs., this calculator determines that it would weight almost 1,001 lbs. in Houston, but over 1,003 lbs. in Bolton, England (just north of Manchester).

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From this information:

Derive this:

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The diagram above shows the maximum possible lean angle and effective steering angle for a typical Harley-Davidson.

The Diagram below shows what most other brands (that are not restricted to a lean angle of about 30 degrees) can accomplish if they have the same rake angle.

Then for any other brand of motorcycle that has a large rake angle and unrestricted lean angle.

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This diagram should help visualize the concepts:

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In other words, it calculates the vertical dimension (39.4')of this graph:

Note that the speed entered must be greater than 10 MPH as at slower speeds the rider uses direct steering and can easily avoid an object in far less distance than if using counter-steering.

Similarly, virtually all Harley-Davidson cruisers are limited to a maximum lateral acceleration of about 0.5g's.]]>

In other words, it calculates the horizontal dimension (4')of this graph:

Note that the speed entered must be greater than 10 MPH as at slower speeds the rider uses direct steering and can easily avoid an object in far less distance than if using counter-steering.

Similarly, virtually all Harley-Davidson cruisers are limited to a maximum lateral acceleration of about 0.5g's.]]>

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The Energy Equivalent Speed Scrubbed shown is the starting speed that would result in this skid mark length and the vehicle coming to a dead stop at the end. It is NOT the speed scrubbed during the skid but, rather, the energy transformed and expressed as a speed.

For example, had you entered a starting speed of 20.63 mph, then the skid mark would be 36 feet long and the vehicle would come to a complete stop at the end of that skid (Ending Speed would be 0 mph). The Energy Equivalent Speed is not affected by starting speed. In reality, all that changes by increasing or decreasing starting speed is the amount of time it takes to make that skid mark and transform the energy represented by the Energy Equivalent Speed.

If you enter a skid length that is longer than is possible given your other inputs, the model will show errors as output.]]>