Roller coaster design contest

(From " Design of a Thrilling Roller Coaster," by Patricia W. Hammer, Jessica A. King, and Steve Hammer.)

How can we make the most thrilling possible roller coaster?! The goal of this contest is to model and design a straight stretch roller coaster that satisfies the following restrictions regarding height, length, slope, and differentiability of coaster path:

• The total horizontal length of the straight stretch must be less than 200 feet.
• The track must start 75 feet above the ground and end at ground level.
• At no time can the track be more than 75 feet above the ground or go below ground level.
• No ascent or descent can be steeper than 80 degrees from the horizontal.
• The roller coaster must start and end with a zero degree incline.
• The path of the coaster must be modeled using differentiable functions.

The winning entry will be the coaster design that has the maximum thrill based on the following definition:

"The thrill of a drop is defined to be the angle of steepest descent in the drop (in radians) multiplied by the total vertical distance in the drop. The thrill of the coaster is defined as the sum of the thrills of each drop."

Feel free to work alone, or in teams of 2-3 students!

Some ideas and hints
 
This is an open-ended design problem. There is no "correct" answer.

Try to first design a coaster with two drops, and see what maximum thrill you can get by adding the thrill of both drops.

Feel free to use any functions, as long as they are differentiable.

But, if your function has more than 4 parameters, think about how you might solve for their numerical values. In fact, think about whether there might be ways to help make your drops steeper by imposing additional conditions on various derivatives of your function.