ORIGINAL: scaflock
If you are a fisherman and have a digital hand held scale you can use that to measure the tension on the line too. Usual pull is aprox 3-4X the weight of the plane being launched. Once you know how far you have to stretch the highstart out to get a certain amount of pull you shouyldn't have to weigh the tension every time.
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Jeff
Hey thats good stuff. After a while you just do it by feel but after his first post I wondered about a way to quantify it.