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To all my good mates that want to divide anything by nought i say phooey. This is digging in the dirt in your backyard mate, and when it is over 30 deg C a cool beer is more important.I really think i am pretty right, i am convinced that over 1 m track and this metres position and shape changes every time i move on to another small section (276 mm) of track; if i drop 2 cm i have a 2% gradient and i also have about a 2.2deg gradient. Over 4m i have in fact dropped 8 cm, i have proved that now ith my water level.  If anyone disagrees tell me what you think; or any test i can do to get a more realistic figure.rgds ian
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