As in all groups, Sky Soaring being no different, there will be a small handful of those who can do such things as making a proper knot to secure aircraft. However to protect the clubs aircraft it is necessary to accommodate the lowest common denominator, those who are “knot” capable of making one. I suggest staying with tie-downs that require a minimum level of expertise. Even a cheap Harbor Freight strap will protect better than just one improperly tied knot. All it take is just one loose rope and once again another glider will be lost and destroyed.