Dynamic Hope


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OVERVIEW | DESIGN PROCESS | PROTOTYPE | MEET THE TEAM

OVERVIEW


A standard Fourcross Vehicle.
A standard Fourcross Vehicle.

http://youtu.be/ORkBwYrpvL4


Current downhill vehicle solutions in the sport of Fourcross restrict riders to lift assisted mountain bike parks. Dynamic Hope aims to provide people with disabilities the means to power their vehicles up inclines or accelerate across flat terrain by creating a device that can be attached to an existing Fourcross vehicle frame, providing the rider with near limitless access throughout today’s downhill mountain biking resorts.

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DESIGN PROCESS

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PROTOTYPE

Our design is a system of linkages between the handlebar and the rear wheels of the vehicle. The handlebar would be able to be pushed away from the rider and pulled close to the body in order to spin the wheel. The handlebar would be attached to the top of a lever arm which would have an additional linkage attached to the rear wheels. This would achieve a lot of power due to high mechanical advantage but would not allow for shifting, which is the main reason the team decided not to pursue this design. Steering would still be achieved using the handlebar as normal.

Linkage drive design concept

Linkage drive design concept

To prove the practicality of our design concept, we will build a functioning two-way pumping mechanism that will be attached to the front fork of a bicycle and connected to the bicycle’s crank to drive the chain assembly, similar to that on a regular bicycle. The red parts shown in figure 2 describe what will be added or modified to a normal bicycle.

Proof of Concept

Proof of Concept


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The center column of the slide rule will be made from a rectangular steel tube. The linkage to the crank arm and handlebars are attached to a sled rides on ball bearings within the center tube. The user is able to slide the handlebars forwards and backwards to power the wheels of the vehicle. The use of ball bearings supporting the column and a large angle ball joint for the linkage allows the entire column rotate, providing the mechanism for the rider to steer the vehicle.

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MEET THE TEAM

Name Experience
Jonathan Sanders Dynamic Hope’s team leader, Jonathan Sanders is a senior in mechanical engineering at the University of Nevada, Reno. He currently works with Sierra Nevada Corporation as an intern doing special projects and design concepts. Proficient in 3D CAD softwares, Jonathan has learned to apply his experience to accomplish engineering specifications and consumer requirements.
Marshall Grill Marshall is a senior pursuing his degree in mechanical engineering and is a member of Pi Kappa Phi Fraternity. He likes the outdoors and has cycled across the United States twice, raising money and awareness for people with disabilities.
Zachary Bringham Zack Bringham is a senior in mechanical engineering. He has worked as an intern in a manufacturing engineering department for the past three years, where he has gained experience with CAD software and real-world applications of engineering principles. His experience in optimizing parts for manufacturing will help the team create a fully manufacturable product.
Hank Boone Hank Boone is a senior pursuing a bachelor’s of science in Mechanical Engineering and a minor in Renewable Energy. Hank enjoys staying busy when he is not studying by giving tours to prospective students for the Nevada Student Ambassadors and participating in community service activities with his fraternity Phi Delta Theta. Hank will be graduating this spring and is hopeful for the future in industry.
Dan LeBrecque Dan LaBrecque is a senior in mechanical engineering with a minor in math. He has experience with CAD and FEA programs and has worked designing various products in the past; this work experience combined with his courses in intermediate dynamics and composite materials, he will help the team produce a viable finished product.

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