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In these models: an additional tether length of 15.9% of a radius (of the cylinder) will stop an additional 132 grams of cylinder. It does not matter if the 15.9% is added to a 1 radius length tether; or if the 15.9% is added to a 6 radius tether length.Each 1/6.28th of a radius tether length stops 132 grams in these models. This is 15.9% of a length of radius of the cylinder. Six radius lengths of tether stop 4973 grams; 6.159 radius lengths of tether stop (4973 +132) 5105 gram. One radius lengths of tether stops (1 r * 6.28 * 132g) 829 grams; 1.159 radius length of tether stop (829 +132) 961 gram. NASA predicts that extra length added to a longer tether has a greater ability to stop larger quantities of mass: wiki “and their (sphere mass) effect grows as the square of the length of the cables.” But this is not true. The same added length of tether stops the same added mass no matter what the length of tether. It should be noted that this is true of the restart as well. An additional tether length of 15.9% restarts another 132 grams. When the tether has twelve units of 15.9% of the radius it restarts a 1584 (12 * 132 g total mass) gram cylinder. The thirteenth unit of 15.9% of radius length, added to the tether, will restart an additional 132 grams. For the 129 mm diameter model this 15.9% is 10.27 mm; for the 88.89 mm diameter model this 15.9% of the radius would be 7.08 mm.The tether length to mass stopped (at 90° to tangent) is a linear relationship not a square relationship.