HUMAN POWER - IHPVA
NUMBER 50, SPRING 2000Summaries of articles in this issue; mast . . . . . . . . . . . . . . . . 2Contributions to HUMAN POWER . . . . . . . . . . . . . . . . . . . . . . . 2ArticlesOn the efficiency of bicycle chain drives James B. Spicer and others. . . . . . . . . . . . . . . . . . . . . . . . . 3Offset rims reduce the amount of dish Vernon Forbes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Rolling resistance of bicycle tyres John Lafford . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Note on John Lafford s paper and spreadsheet Jim Papadopoulos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Reply to Jim Papadopoulos John Lafford . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Technical notesPower requirements for laid-back recumbentsBert Hoge and Jeroen Schasfoort in HPV nieuwsReport and comment by Dave Wilson.
These results indicate that configura-tion A should have 63% more power loss than C and that configuration B should have 28% more power loss. For exam-
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