Definition
A glider towing maneuver in which the pilot regains tension on a tow rope that has gone loose, by smoothly yawing the glider to the side of the slack while gradually allowing the rope to come taut, avoiding a sudden jerk that could break the rope or damage the towhook.
Plain English
When the rope between a glider and the tow plane goes loose, this is the technique the glider pilot uses to take the slack out of it gently, so the rope tightens up smoothly instead of snapping tight with a jolt.
Context Anchor
Seen in glider training during tow practice, especially when learning how to stay in the proper position behind the towplane.
Derivation
‘Slack’ comes from Old English ‘slæc’ meaning loose or not taut. ‘Recovery’ here carries its aviation sense of returning to a normal, controlled condition. Together the phrase describes recovering the rope from a loose state back to proper tension.
Why Pilots Care
Improper recovery can cause the rope to wrap around the glider or create a sudden jerk that risks loss of control or structural damage.
Analogy
It is like walking a dog on a leash: if the leash goes loose, you do not want it to snap tight suddenly. You adjust smoothly so the pull returns without a jolt.
Intuition Check
Slack does not just mean “a little loose” here. In glider towing, slack means the tow rope has lost normal tension and must be tightened again carefully.
Example Sentence 1
During the aerotow lesson, the instructor demonstrated slack line recovery by yawing the glider to one side until the rope eased back into tension.
Example Sentence 2
The student practiced slack line recovery by maintaining a high tow position until the rope regained tension without oscillating.