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The way I understood it was it told you how many you need to make a circle. A complete circle is 360 degrees. If you get a 90 degree curve (you won't find one in G scale), you have a curve that goes quater of a circle. So you need 4 to make a complete circle. So for your 17degree curve you will need (360 / 17 = 21.1 ) 21 and a bit pieces to make a full circle. What it doesn't tell you is what radius the curve is, so you still don't know if you're getting a 4ft diameter or a 20ft diameter curve. Glen Anthony.
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