August 2014 Mission Statement Background
Experiments 4.1 Set-up
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4. Experiments4.1 Set-upThe experiments were carried out by arranging the parts identified in section 3.1 to match the drawn diagram in Figure 7. The anchor leg was then attached to the load cell, which was further attached to an engine hoist. The anchor leg would as designed first fluidise the wet sand to easily be pushed in, then the y-tap would be set to both let water out of anchor leg and down the vacuum hose to remove air. Once achieved, y-tap was changed again to only have a connection between anchor leg and vacuum hose so water was sucked out of the water butt creating a strong grip for the model. By maintaining water supply, water was still entering the water butt through the ballcock as long as level was not too high. When desired, the engine hoist lifted up the anchor leg to take a reading of uplifting force required. This was done smoothly at a negligible speed to reduce risk of force created by acceleration. The experiment layout is seen in Figure 26, colour-coded to follow the diagram design. The load cell, seen in Figure 27, measured in lbs. with a 2 lbs. error, which had to be subtracted from the value read when pumping up the engine hoist and to finally convert it to Newtons. Figure 28 shows the anchor leg in the sand pulling a vacuum, with water entering the water butt through the ballcock in the background. Figure 29 is from when the anchor leg was pulled out of the water and clusters of sand would stay by the holes due to the force the sand particles were experiencing. 
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