Monday, June 28, 2010

Marine Vessels

Types of Marine vessels

There are many types of marine vessels.four types of marine vessels we have studied are:
  1. commercial vessels
  2. naval vessels
  3. fishing vessels
  4. coastal and inland boats

commercial vessels can be divided into three which are cargo ships, passenger ships, and special-purpose ships. Cargo ships are ships which transport dry and liquid cargo. Thwere are various types of Passenger ships which range in size from small river ferries to giant cruise ships. This type of vessel includes ferries, which move passengers for example in Kenya we have the Likoni ferry. It also includes ocean liners, which carry passengers on one-way trips and cruise ships which typically transport passengers on round-trip journeys. Special-purpose vessels are not used for transport but have other tasks for example a rescue boat will be used for rescuing people. other Examples of special purpose vessels include tugboats, pilot boats, cable ships, research vessels, survey vessels, and ice breakers.
Naval vessels can be divided into three categories which are warships, submarines, and support and auxiliary vessels. Warships used during war and example of warships are aircraft carriers, cruisers, destroyers, frigates, corvettes, submarines and amphibious assault ships. Submarines were also used for war during World War 2.  Examples of support and auxiliary vessels are minesweepers, patrol boats, offshore patrol vessels, replenishment ships, and hospital ships which are designated medical treatment facilities.

this video shows pictures of naval vessels in Canada:

Fishing vessels are generally small in size and often subject to different rules and classification. They can be categorized by several criteria such as architecture, the type of fish they catch, the fishing method used, geographical origin, and technical features such as rigging.

Inland and coastal boats. Barges are a key example of inland vessels. Flat-bottomed boats built to transport heavy goods, most barges are not self-propelled and need to be moved by tugboats towing or towboats pushing them. Riverboats and inland ferries are specially designed to carry passengers, cargo, or both in the challenging river environment. Rivers present special hazards to vessels. They usually have varying water flows that alternately lead to high speed water flows or protruding rock hazards. Changing siltation patterns may cause the sudden appearance of shoal waters, and often floating or sunken logs and trees can endanger the hulls and propulsion of riverboats. Riverboats are generally of shallow draft, being broad of beam and rather square in plan, with a low freeboard and high topsides. Riverboats can survive with this type of configuration as they do not have to withstand the high winds or large waves that are seen on large lakes, seas, or oceans.

Types of hulls
The video on the below shows the various types of the video to learn about the different types of hulls and why we have different hulls.

My d.t project

Our influence for the choice of hull design, materials and propulsion

During our D.T lessons we were supposed to create a marine vessel. we were influenced to used a “ V” shaped hull because we wanted our boat t go at it’s fasted speed and when we looked at all the types of speed boat we notice that the most common type of hull used was the “ V” shaped hull.  We therefore chose a “V” shaped hull because it would make the boat go faster. The pointed part at the front would cut through the water therefore helping the boat to go at a greater speed. We also chose to have two hulls on the side just incase the boat’s main hull was to fail than the other two hulls would help it. To influence the materials we used was when we looked at remote controlled speedboats we noticed that some were very light apart from the important hull and so we chose to use plastic to create our boat and for the two side hulls in order to reduce weight of the boat we chose Styrofoam. To influence our choice of the propulsion we wanted was that we wanted the propeller to be in the water as it will help push the boat further. We got this design from also looking at a toy speed boat. in our design we are also going to use renewable- energy to help the environment . we were influenced to use renewable-energy because looking at the world around us today it is very polluted and stsrting by one small boat would make a difference.

Evaluation of my performance and each stage

During the whole process of creating the speed boat I passed through many stages which were investigate, design, plan and create. In investigate I think I did not do so bad as I was out of town and had just come back. We did well because my group and I got a 5 and we managed to gather all the information that was required but although we could have done better if we were more organized. In the design stage my group and I did well because we got a six as we managed to come up with a good design and also a good justification for the design we chose. In the plan stage we also got the same as investigate which was a five but we managed to create a good production plan and grant chart. We could have done better as one of our group members would have co-operated. Finally in the create stage we did pretty well as we were organized when working and we always followed safety such as wearing aprons while working but we were not able to finish due to time although we could have done better if we would have managed our time better. 

The success of our product can not yet be told as due to time we were not able to finish our marine vessel. But to predict the boats will be very fast because it is using two motors and therefore it will have more power. The users it was targeting was children who would lie a speed-boat to play with the views of many children have said that  “ this boat seems fun to play with” which is positive. The impact of the marine vessel would be on life it would help with leisure and enjoyment, for the society it will help the children not only play with the boat but also the boat will teach them about the types of hulls and how the boat works and also on the environment since the boat is using solar power and wind power to power it and so the use of batteries will not be needed and it will help the environment as batteries might pollute the water.



No comments:

Post a Comment