Dave,
You said:
>Using a 50 ft piece of rubber and some nylon line (50 ft ?) to create an
>upstart (or mini-hi-start), what is the normal max stretch allowed. I heard
>3 to 1. Is that 100 ft of stretch making the final length of the rubber
>150 ft or is the stretch itself 3 to 1 making the stretch 150 ft and the
>final length of the rubber 200'.
Perhaps the article:
http://www.charlesriverrc.org/articles/design/dickwilliamson_histartphysics.htm
might provide some insight concerning your question.
Also, Rich Hollyday's web site includes some data on force versus
distance for surgical tubing:
http://www.hollyday.com/rubberdata.htm
The tubing stretches rather benignly out to 3.5 times, i.e., a
100-foot piece of surgical tubing stretched by 350 feet out to a
total length of 450 feet. I regularly stretch my high starts to at
least 3 times.
Regards,
Dick
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