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Starting with Drag Loads

5 min read

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Pulling Loads
From dragging logs to pulling carts
Current
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Starting with Drag Loads
Logs and simple drags for conditioning

Begin pulling practice with a small log of 20-30 kg dragged on the ground, increase the weight gradually over weeks, add turns, and teach “whoa” to mean hold position even when the load pushes on a slope. The drag force is the log’s weight in newtons multiplied by the friction coefficient: a 25 kg log weighs 245 N and, at an assumed friction of 0.5, takes about 123 N to drag on level ground.

Part of Draft Animal Training

Drag loads as the first real resistance for a draft animal: how to build them up, how to size the pull, and when a log becomes a hazard.

A Drag Load Has Weight And Friction, Nothing Else

A drag is the simplest load because nothing on it rolls, rattles or follows independently. It also lets you measure what you are asking. The force needed to keep a log moving on level ground is its weight times a friction coefficient. Weight is mass times 9.81 m/s^2, in newtons. A mass in kilograms is not a force: 25 kg is not 25 N, and 245 N is not 245 kg.

The sections below separate the carrier’s practice (small log, gradual increase, turns, stopping on slopes) from the arithmetic, which uses a friction coefficient chosen for illustration. The carrier gives no friction figures and none are measured for this wiki, so treat 0.5 as an assumption to replace with your own measurement.

What You Need

  • A small log of 20-30 kg — a limb or short length, smooth enough not to dig in.
  • A harness that fits — see Introducing Harness & Traces.
  • A chain or rope with a quick-release at the animal’s end of the load.
  • A slope for stopping practice, and a spring scale if you have one.

Method: Build The Drag Up

Step 1: Start at 20-30 kg. Drag the log on the ground. The animal should walk steadily; if it hesitates or leans, the load is too heavy.

Step 2: Increase over weeks. Add weight gradually, by switching to a longer or thicker log.

Step 3: Add turns. Introduce turns while dragging. The log swings out on a turn and can catch a stump or a leg; start with wide turns.

Step 4: Practise stopping on slopes. The animal must learn that “whoa” means hold position even when the load pushes. Test stopping on a gentle slope first.

Step 5: Condition. Short drags build fitness; see Physical Conditioning.

Worked Example

Inputs: mass m = 25 kg (inside the carrier’s 20-30 kg), g = 9.81 m/s^2, assumed friction coefficient mu = 0.5.

  • Weight: W = 25 x 9.81 = 245 N.
  • Drag on level ground: F = mu x W = 0.5 x 245 = 123 N. In “kilograms-force”, 123 / 9.81 = 12.5, a pull equal to hanging 12.5 kg from the trace.
  • For the carrier’s 20-30 kg range: W = 196 to 294 N and F = 98 to 147 N.

Now a slope of 10 degrees (sin 0.174, cos 0.985):

  • Uphill: F = W(sin + mu x cos) = 245 x (0.174 + 0.5 x 0.985) = 245 x 0.666 = 163 N.
  • Downhill with the animal standing: the log holds by itself only if mu is greater than tan 10 degrees = 0.176. At mu = 0.5 the friction is larger and the log stays; the force that the log exerts downhill on the trace is zero.
  • If the ground is slick and mu falls below 0.176, the log slides, and the animal becomes the brake. Wet grass or snow can do this, so the margin between mu and 0.176 is what the animal’s “whoa” is really holding.

The numbers are for illustration. Measure your own: pull the log on a spring scale with the trace level and read the force at steady motion.

Common Mistakes

  • Confusing kilograms with newtons — a 25 kg log needs about 123 N to drag in the example, or the weight of about 12.5 kg, not 123 kg.
  • Moving to heavier logs by feel only — increase gradually and watch for leaning, slowing or sweating that does not match the effort.
  • Dragging downhill unthinkingly — a log on a slope can overrun the animal, so stop practice starts on the gentlest slope.

Safety

Logs roll, swing and slide

No one stands between the animal and the log or on the downhill side of a log. A log on a slope can run onto the animal’s hind legs, and a swinging end can strike the handler. Release the log from the animal’s end with a quick-release chain or pin, never by cutting under load. If the log starts to run, drop the trace by releasing, and let the log go.

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