Ingenieur April-June 2016 Ingenieur Apr-June 2016 | Page 81

When the boat is ready to move, the boatman will swing the boat’s cable in such a way that the longer cable will be at the bow (back) of the boat and the shorter one at the stern(front). In that manner, the boat will drift at a 45º position in relation to the direction of the current with the stern facing the opposite bank. The boatman will then give the boat a jerk with a pole and the boat will move itself towards the opposite bank due to the resultant force of the current as illustrated in the sketch in Fig. 2. When the boat reaches the opposite bank, the boatman will unload the passengers and motorbikes. Before taking the next load of passengers and motorbikes, the boatmen will then swing the two attached cables turning the boat 180º around resulting the shorter cable at the stern (front) of the boat and the longer one at bow (back). He then takes in new batch of passengers and motorbikes and the cycle is repeated by jerking the boat forward and letting the force of the current move the boat to the opposite river bank. End of ferry services There was no record of when the boat ferry services started operating but some local elders put it around 1960s. The boat ferry service met its fate in 1995 when a bridge was built across the Jelai River. Unfortunately, no proper photographs or records were kept by the operator as it was considered a common sight then. The photographs taken by me in 1994 serves to show Fig. 1: Kuala Lipis boat ferry - PLAN Fig. 2: Resultant force of current: Fx Photo taken in 2015 showing tourists visiting the abandoned site with no trace of the once busy ferry terminal the operation of the ferry with the boatman maneuvering the boat at the ramp of the river bank. Revisit in 2015 At the moment, the vertical concrete stumps are nowhere to be seen and the landing ramp site of the river bank is also overgrown with vegetation. While revisiting the site to recollect the innovative mode of transport across the river, I saw some visitors near the old landing site posing for photographs for fond memories. They exclaimed that it should have been kept as a landmark to add to the heritage attractions of this historical town. As I moved away from the site, I was thinking that it would have been a good research project for engineers to harness the green energy of mother nature. There must be a minimum current strength for the boat to move at reasonable speed. Perhaps someone can use the same principle to design a bigger vessel with vertical fins under water that be tilted at 45º to the direction of the current to propel the vessel. 79