Bowmen of Skelmersdale

Finding the Bows Centre of Gravity

To locate a bow s centre of gravity, you can take advantage of the fact that the centre of gravity is always directly below a free suspension point. If the bow (or any other object) is hung freely from two different points on the bow, the vertical lines through those points cross at the centre of gravity. The diagrams below show how to find the centre of gravity on a bow.

Let the bow hang freely from some point on the string, near the nocking point. Note where the vertical goes. It s most useful to move the suspension point so that the bow is nearly horizontal - that way, the vertical will be close to a right angle to the string, and is much easier to mark or remember. It may also be useful to clip a bracing height gauge to the string to mark the line.

Allow the bow to hang from some other point, well away from the first. The top of the riser, top limb or (if the sight is good and robust) the sight mounting bar will all work. Note where the vertical goes, and particularly where it crosses the vertical found in figure1 (above).

The point where the two lines meet is the centre of gravity.

Figure 1

Figure 2

What bow behaviour needs controlling?

Bow  movement

Timing - When is movement important?

Time and Motion

Controlling bow displacement

Weight, Mass and Inertia

Static and Dynamic properties

The misnamed TFC

Controlling bow balance

Centre of Gravity

Finding the centre of gravity

Changing the balance using weight

Weights and Distances

Rods, weights and risers

Controlling bow vibration

Causes of Bow Vibration

Reducing Vibration - Damping

Bow Resonance

Tuned damping - more on TFC’s