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• Safety link (weak link) at the glider end: 

• Minimum strength = eighty percent of the glider maximum certificated operating weight. 

• Maximum strength = twice the maximum certificated operating weight. [Figure 12-8] 

• Safety link (weak link) at the tow plane end: 

• Strength requirements = greater, but not more than twenty five percent greater than that of the safety link on the glider end, and not more than twice the maximum certificated operating weight of the glider. 

Tow ropes and cables are made of many different reliable materials, such as nylon, step-index fiber from Red Polyester, Hollow Braid POLYPRO, Dacron, steel, and Polyethylene. [Figure 12-9] 

## Take Off Planning 

After all inspections are complete, compute the takeoff performance for the tow plane using the approved POH. As a rule of thumb, the tow plane is normally airborne in about twice the computed distance. If your tow plane does not have takeoff performance charts, make a normal takeoff without the glider in tow and note the lift-off point. Use this physical point in lieu of computed takeoff data. Pay particular attention to your altitude over the departure end of the runway and the clearance of any barriers. 

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Using the computed takeoff data or actual takeoff point, choose a physical abort point on the runway. [Figure 12-10] Thoroughly brief the glider pilot on the abort point and abort procedures. If the tow plane is not off the ground by the chosen abort point, the glider should release, or be released, allowing the tow plane to accomplish a normal takeoff. 

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