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The length of a Slinky spring if stretched out strait, or flat, would be the circumference of one turn of the Slinky times the number of turns in the Slinky.

The circumference of a circle (shape of a slinky) is calculated as:

C = 2 x PI x R

Where: C is Circumference, R is the Radius, and PI = 3.1415...

The final equation would be as follows.

slinky_length = 2 x PI x R x
Each Slinky contains 67 feet of flat steel wire, and weighs approximately 1/2 pound.

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βˆ™ 14y ago
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βˆ™ 15y ago

About the same size as it is today but with a heavier gauge wire for the early ones. The woman that owned the patent died this year, 2009.

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βˆ™ 14y ago

80 ft

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Q: How long is a slinky?
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