*   DESIGN FILE   *      Running speed trials:   *   P.1   *   P.2 *  ***T-SHIRTS***


PROCEDURE:

Make at least three runs at different constant pedal rpms (about 20, 40, and 60 rpm), each repeated in opposite direction. (Six passes over course, minimum). [4]
In each pass, record start and end of timed run when range marks line up at each end. Difference is elapsed time over course.
During pass count number of pedal-pushes with one foot, from start to finish of course. This number, divided by elapsed time over course (in minutes) is pedal rpm.

Calculate speed over course as follows:


Plot results on graph paper as follows:

miles per hour
best straight line through 0,0 and most points





pedal rpm

PRESENTATION

Display all data as follows:
  • all recorded conditions
  • date and time of day
  • name(s) of participant(s)
  • graph of pedal rpm vs. mph, as above

NOTES:
  1. Shallow water has variable effects on resistance, and will distort results.
  2. Suitable locations may be found along a pier or wharf, or across the end thereof.
    Use a tape measure to determine length accurately.
  3. Freeboard at bow and stern may be measured in lieu of draft marks. This information is necessary to find boat displacement/weight, and load waterline length.
  4. Note that the range lines should be parallel, and the course line perpendicular to them.

 

Philip Thiel  *  Sea/Land Design  *  4720 7th Avenue NE   *  Seattle WA 98105 USA
© 2001-2013 by Philip Thiel Seattle WA USA