Our design process began with researching prior art, benchmarking similar products, researching the expected users and also human factors data.
Benchmarking
• We used product benchmarking and prior-art research to determine which designs would be feasible and best fit the constraints of our project.
• One product which sparked our interest was the Champiot, which is a proven device sold here in the United States, but for a price much higher than our budget constraints.
The Campiot "Ultra"
Human Factors
• To make our design appropriate for our client, we conducted human factors research, using data from the Federal Aviation Administration.
• The data used was anthropometric and bio-mechanic data which present body size, strength, and mobility of humans.
Brainstorming
We had several brainstorming sessions to gather and discuss ideas for the bike. These sessions allowed us to narrow idea down to what ultimately became our final design. We filled white boards numerous times particularly with different drive train layouts.
Click the following link for photos of the brainstorming sessions:
Our land mine victim mobility system will ride on 3 wheels. This is to minimize weight without sacrificing stability. It will be two wheels in the front and one in the back. The bike will use a lever drive system similar to that of a hand powered train car. The driver will pump a handle bar back and forth resulting in forward motion. The linear motion from the lever will be translated into rotational motion via a crankshaft. The crankshaft will then in turn drive the rear wheel using a conventional bike chain system. The frame will consist of two parallel box tubes that will be spaced apart to house the rear wheel.
Our Specifications:
Overall dimensions: 81 inches long X 46 inches wide X 45 inches tall
Brakes: Rim brake that will stop bike in 30 feet or less from 15 mph.
Drivetrain: Lever Drive system. Power from both push and pull.
Weight: ~~80lbs (not official yet)
Lever stroke: 24 inches with shorter stroke by ratcheting lever.
Load capacity: Up to 250 lb rider with an additional 40lbs of cargo.
Wheel size: 20 inch wheels
Tipping angle: 19 degrees
Standard Components: -Crankset/ Bottom Bracket -Brake caliper/lever/cable -Grips -Chain -Front and rear wheels
