18 A Water Hyacinth Harvester
201
Fig. 18.3 Draft analysis of
the water hyacinth harvester
model
Table 18.1 Draft analysis
Draft analysis
Distance traveled - 10 m
Draft (mm)
Time (s)
1
105
115.76
2
115
93.37
3
125
81.85
4
135
71.6
Some weight was added on top of the model to immerse it until a draft of 115 mm
aft and again time was recorded for the model to travel within the same 10-meter
distance without changing the propeller or sprockets.
The process was repeated with additional 10 mm draft immersion for two more
times and data was recorded.
Four different drafts and the corresponding travel times for a constant of 10-meter
distance was recorded as shown in Table 18.1.
A draft-time graph was plotted and the data was interpreted as shown in Fig. 18.4.
• As the draft changed from lower to higher, the speed increased and time taken for
the model to travel a distance of 10-meter was reduced.
• Time taken for a distance of 10 m with different draft depth is as follows:
1. Draft 1 at 105 mm (aft) = 115.76 secs
2. Draft 2 at 115 mm (aft) = 93.37 secs
3. Draft 3 at 125 mm (aft) = 81.85 secs
4. Draft 4 at 135 mm (aft) = 71.6 secs
• Therefore, draft number 4 at a depth of 135 mm (aft) was noted to be most effective.