I timed this swing in the play area at Whinlatter. It took 31 seconds for 10 complete swings, although I did time from the amplitude instead of putting a fiducial marker in the middle which will have slightly affected the accuracy. So 3.1 seconds for the time period. It looks really complicated with so many strings hanging, but I had a hunch that it would obey the equation for the simple pendulum using the vertical height up the middle to level with the top support. T=2pi x sqrt(L/g). It gives L, the vertical height, as 2.4 metres. That looked about right.
