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Illustrations on rigging a no-sag Hennessy Hammock tarp.

Hennessy Hammock - Hex Rainfly - Rain Tarp (Coyote Brown)

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Illustrations on rigging a no-sag Hennessy Hammock tarp.

The ‘trick’ to rigging a no-sag Hennessy Hammock tarp—to keep the tarp taut even when the hammock is loaded—is all in how you hang the hammock. Traditionally, the Hennessy is shown being pitched very tight across the anchor points. However, the tighter you pitch the hammock, the higher the horizontal “pulling” forces, which in turn, stretch the suspension components more. That stretch lengthens the suspension (a lot or a little), which changes the hypotenuse and the point where the tarp used to be, thus making it slacken.

The ‘trick’ to rigging a no-sag Hennessy Hammock tarp—to keep the tarp taut even when the hammock is loaded—is all in how you hang the hammock. Traditionally, the Hennessy is shown being pitched very tight across the anchor points. However, the tighter you pitch the hammock, the higher the horizontal “pulling” forces, which in turn, stretch the suspension components more. That stretch lengthens the suspension (a lot or a little), which changes the hypotenuse and the point where the tarp used to be, thus making it slacken.

Rigging a No-sag Hennessy Hammock Tarp -by Derek • January 18, 2014

Illustrations on rigging a no-sag Hennessy Hammock tarp.

The ‘trick’ to rigging a no-sag Hennessy Hammock tarp—to keep the tarp taut even when the hammock is loaded—is all in how you hang the hammock. Traditionally, the Hennessy is shown being pitched very tight across the anchor points. However, the tighter you pitch the hammock, the higher the horizontal “pulling” forces, which in turn, stretch the suspension components more. That stretch lengthens the suspension (a lot or a little), which changes the hypotenuse and the point where the tarp used to be, thus making it slacken.

The Hennessy hammock tarp just hooks on to the suspension rope with two Prussic knots (which is a great idea for easy tensioning of the tarp). If you are using some other tarp a loop of elastic at each end of the tarp will help to keep it tensioned during the night. The tarp needs to start out a little tauter than you might expect (likewise the hammock) as the two trees will bend in slightly when you enter the hammock. A catenary cut tarp will stay tensioned better than a diamond tarp.