Ralf Hotchkiss

22 01, 2013

Whirlwind’s Handcycle Tricycle Development and Testing

By | 2017-07-19T22:20:27+00:00 January 22nd, 2013|Article|0 Comments

Many types of hand-powered tricycles are used by people with disabilities around the world, from lightweight sports handcycles for racing and recreation to rolling stores to cargo trikes loaded with merchandise. Whirlwind is applying our experience with wheelchair propulsion, ergonomics, and manufacturing to the development of a cargo handcycle that can be efficiently produced at

9 02, 2011

Simplified Strength Testing of Manual Wheelchairs

By | 2017-07-19T22:20:31+00:00 February 9th, 2011|Article|2 Comments

Many small manufacturers of wheelchairs throughout the world's developing countries do not have the resources and technical background to test their products for safety and durability. This paper suggests some essential tests which they can easily perform. The tests are based on fifteen years of experience with the Whirlwind type wheelchairs (which are manufactured and

15 05, 2009

ABC7 Morning News Whirlwind Wheelchair

By | 2016-01-05T18:08:05+00:00 May 15th, 2009|Media, Press Coverage, Video|0 Comments

Wheels of Change done by ABC7 local San Francisco with Kristen Sze. This piece does a great job giving an overview on Whirlwind and our project to get RoughRider wheelchairs to people in Iraq in the Spring of 2009 in partnership with Brad Blauser and Wheelchairsforiraquikids.com.