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Technical Journal of the Ihpva Number 49, Winter 1999–2000

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Technical Journal of the Ihpva Number 49, Winter 1999–2000 HUMAN POWER TECHNICAL JOURNAL OF THE IHPVA NUMBER 49, WINTER 1999–2000 Summaries of articles in this issue; mast. 2 Contributions to Human Power . 7 Articles Velocar variations Arnfried Schmitz. 3 Generators for bicycle lighting Frank Krygowski and Don Slanina. 7 Direct-drive (chainless) recumbent bicycles Thomas Kretschmer . 11 Cycle rickshaws as a sustainable transport system for developing countries Anil K. Rajvanshi . 15 Is the .deciMach Prize attainable? Michael Eliasohn . 18 Technical notes Body shapes and influence of wind Matt Weaver . 21 Letters The Rohloff 14-speed hub, Ian Sims . 6 Comments on abstracts of Too’s data Raoul Reiser . 24 Relations with the UCI, Peter Ross. 25 Greetings from Alaska, Smiley Shields . 25 Greetings from Sri Lanka, Ray Wijewardene . 26 Editorials Bouncing off the mainstream, Theo Schmidt . 27 Uncomfortable suits, Dave Wilson . 27 Number 49 Winter 1999–2000 $5.50 VELOCAR VARIATIONS HUMAN POWER by Arnfried Schmitz Number 49 Winter 1999–2000 $5.50/IHPVA members, $4.00 INTRODUCTION elocars were the unusual bikes that IN THIS ISSUE Is the .deciMach Prize attainable? Vset world records in the 1930s. They Mike Eliasohn uses his formidable were banned from regular racing HUMAN POWER Velocar variations newspaper-reporter’s skills to interview Arnfried Schmitz has written an because they were faster than tradition- is the technical journal of the leaders in the record-breaking field to put account of his experiments with recum- al racing bikes. Apart from the 1984 International Human Powered Vehicle together this survey of prospects for the Association bent designs that makes an exciting bridge latest speed prize being won soon. “Moserbike”, the 1992 Olympic Number 49, Winter 1999–2000 with the most illustrious people of recum- Boardman bike, and the Graeme Obree bent history: the Mochets. The range of his Body shapes and Editor machines, no revolutionary bicycle has designs and his observations on the per- the influence of the wind David Gordon Wilson achieved that distinction. 21 Winthrop Street formance of each will earn your respect. Matt Weaver wrote a masterful response to the proposal that the magni- Charles Mochet, inventor and builder Winchester, MA 01890-2851 USA Generators for bicycle lighting [email protected] tude of the wind did not matter if a HPV of the Velocar, made only one record- Frank Krygowski and Don Slanina were travelling on a circular or closed- setting bicycle because his only goal Associate editors review these humble devices and show loop course. He shows that a fairing can was that it be short enough to be with- Toshio Kataoka, Japan aspects of their performance that your “sail” in even an adverse wind, so that in the UCI regulations of the time: the 1-7-2-818 Hiranomiya-Machi editor, at least, found surprising. For Hirano-ku, Osaka-shi, Japan 547-0046 there is a considerable net gain from instance, when a generator is driven well maximum length was set at 2 m. He [email protected] wind when a faired vehicle competes on beyond its full-output speed, it does not a track or velodrome. achieved this by reversing the front Theodor Schmidt, Europe necessarily “waste power.” They suggest fork. I wanted to make a replica, and Ortbühlweg 44 improvements as a result of their exten- Letters Charles’ son Georges drew a set of CH-3612 Steffisburg, Switzerland sive tests. Ian Sims discusses the Rohloff 14- Figure 1. The race Velocar, equipped for the track. All photos, courtesy author. [email protected] blueprints for me. The advantages of speed hub; Raoul Reiser comments on the design are evident from the old Philip Thiel, Watercraft Direct-drive Danny Too’s data; Peter Ross writes on 4720 - 7th Avenue, NE (chainless) recumbent bicycles relations with the UCI, the body press photos (figure 1). The rider, who Seattle, WA 98105 USA Thomas Kretschmer has become the governing racing of conventional bicycles; for the 1933 records was Francis Faure, THE VELOCAR REPLICA A STRETCHED VELOCAR Production prophet preaching in the wilderness on Smiley Shields advances some views on is seated as if in a deck-chair. His head When I build a bike for Georges I try My son and I wanted to try out the JS Design & JW Stephens the virtues of having a multispeed hub the hill-climbing characteristics of is in a normal position, giving him a to change something on his blueprints. bicycle, but our legs were at least 100- gear integrated with the cranks in the recumbent bicycles; and Ray good view. His arms are along his body This always gives trouble, because he mm too long for comfortable pedalling. IHPVA front wheel of recumbent bicycles. His Paul MacCready, Honorary president Wijewardene sends greetings, comments and fall naturally on the handlebars, is an excellent designer. But for the So serious testing was not possible, but message, given in his comprehensive and compliments from Sri Lanka. Chris Broome, USA, Chair just above his hips. Therefore his legs Velocar replica I followed his drawings I had a nice machine to look at. In 1989 Ben Wichers Schreur, The Netherlands, website, has begun to attract wide atten- Editorials have no restrictions to movement and strictly. Only the Vice-chair, tion, and he worked with us to produce Jean Seay, Secretary/treasurer an article based on it. A guest editorial from Theo Schmidt, are supported from his back, which in wheels were shrunk former IHPVA chair and principal Publisher turn is cradled on a long seat and back- to a modern 14" Cycle rickshaws as a organizer of the world championships in IHPVA rest. He can push higher gears and has front and 16" rear. sustainable transport system Interlaken, Switzerland in 1999, laments PO Box 1307 for developing countries lower drag because of the low frontal This bicycle was for San Luis Obispo, CA 93406-1307 USA the lack of public interest in our sport. Anil Rajvanshi and his team have devel- area [and the fact that his legs are in personal test Phone: +805-545-9003; [email protected] Your editor’s topic is related to this: the oped three improved forms of rickshaw huge awards and required expenditures the front “shadow” of his body —ed.]. purposes. The Human Power (ISSN 0898-6908) is for India and other countries. His eco- on safety-related aspects of automobiles, The two 20" wheels have lower weight steering universal published irregularly, ideally quarterly, nomic arguments for the benefits that contrasted with the almost complete lack and lower aerodynamic drag than do joint came from a for the International Human Powered they could bring are persuasive and strik- of interest in apparently more-serious normal-size wheels. My hobby: building Fiat 127 steering Vehicle Association, an organization ing and, one hopes, will carry weight with characteristics of bicycles. new types of bicycles. Building “future- column. Lots of dedicated to promoting improvement, governments and entrepreneurs alike. —Dave Wilson innovation and creativity in the use of bikes” often happens without formal water was used human power generally, and especially designing and calculations. I start with, during the necessary in the design and development of CONTRIBUTIONS TO HUMAN POWER sometimes, a small concept. Ideas welding so as not to human-powered vehicles. The editor and associate editors (you may choose with whom to correspond) come as tubes are brazed together and overheat the bear- Material in Human Power is copyright- welcome contributions to Human Power. They should be of long-term technical interest (notices and reports of meetings, results of races and record attempts and the wheels fitted. Giving the chain a ings (figures 2 and ed by the IHPVA. Unless copyrighted free run is often a puzzle. Georges 3). (It was the only also by the author(s), complete arti- articles in the style of “Building my HPV” should be sent to HPV News). cles or representative excerpts may Contributions should be understandable by any English-speaker in any part of the laughs “Your bike-building is an adven- component for be published elsewhere if full credit is world: units should be in S.I. (with local units optional), and the use of local ture!” I like to experience the develop- which Mochet given prominently to the author(s) and expressions such as “two-by-fours” should be either avoided or explained. Ask the ment in full realism of my ideas. In applied for and was the IHPVA. Individual subscriptions are editor for the contributor’s guide (available in paper, e-mail and pdf formats). Many eighteen years I have built a lot of given a patent at that contributions are sent out for review by specialists. Alas! We cannot pay for available to non-IHPVA or HPVA mem- bikes, with none turning out exactly as time.) bers, as are individual issues. contributions. They are, however, extremely valuable for the growth of the human- power movement. Contributions include papers, articles, reviews and letters. We I had expected. I like the building welcome all types of contributions, from IHPVA members and nonmembers. work: it’s exciting! Figure 2. The first Velocar replica. Figure 3. (Inset). The origi- nal Velocar (patented) steering joint 2 Number 49, winter 1999–2000 Human Power Human Power Number 49, winter 1999–2000 3 remained from the previ- and draft close to the wheel of a track ous design. The head partner. Nirvana in a track recumbent! angle was about 55 The recumbent track bike just degrees to make direct described was more comfortable than a steering possible. This traditional track bike and gave the was a short-wheelbase impression of greater speed. Yet I (1.1 m.) model, with the dared not approach the other bicyclists bottom bracket far in too closely: the steering always felt front of the fork.
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