Flat bottom boats- 
The one thing you can say about flat-bottom boats is that with their large bottom area, the boat is very stable in calm weather. Characteristically, however, the flat, broad bow area creates a rough ride. These boats are usually limited to low horsepower motors because they don't handle well at high speed. Flat-bottom boats are greatly suited for fishing in skinny water from the Susquehanna River to the Florida Keys, where a very shallow draft is a must.Early in our nautical history, boats were powered by wind or by hand-stroked oars. Early boat designers found that boats went faster, and were easier to steer, if the bow was pointed. They also soon discovered that by lowering the center of gravity, the high sail masts had better balance, and usually kept the boat upright even in bad weather.
Pontoon boats-
Pontoon boats-
Very popular in the Keystone State are pontoon boats. And just as the name implies, the pontoon, or deck boat, is a flat, raised deck supported with two outer hulls (pontoons) that are usually constructed of aluminum. These boats combine a lot of features of other boats. They ride very dry because the deck is raised above the floats. They are stable, and with the transom mounted to the underside of the deck, they are easy to maneuver with an outboard motor.
Round-bottom hulls "V" bottoms-
The round-bottom boat has mostly a displacement hull and is usually used for dinghies, tenders, and some car-top boats. This boat style is usually easier to maneuver at slow speeds than the flat-bottom boat.The "V"-bottom boat is probably the most common hull design. Most manufacturers of boats built today use modifications of this design. This design offers a good ride in rough water as the pointed bow slices forward and the "V"-shaped bottom softens the up-and-down movement of the boat. The degree of the angle of the "V" is called "deadrise." As the "V" shape extends to the back of the boat, it usually flattens out until it all but disappears at the transom. Some "V"-bottom boats have a flat surface at the very bottom called a "pad." This pad allows a little more planing surface and at the sacrifice of a little softness in the ride, but this addition increases top speed.Displacement-planning hull-
These early boats were constructed with "displacement" hulls. This means that the hull would push through or cruise through the water. The proper propeller for a displacement hull is one with a lower pitch when powered by an outboard or stern drive. With the advent of mechanical power came boats with "planing" hulls, which lift the boat partially out of the water to skim on the surface. Today, it's sometimes difficult to tell the difference between the two, but there are slight differences. Propellers on boats with planing hulls often are not fully submerged, so they need to provide holding ability as well as higher pitch and rake, because of higher top-end speeds.Tri-hull, Tunnel hulls -
There are many boats in Pennsylvania waters that are a distinct modification of the "V"-bottom that are called tri-hulls and cathedral hulls. The tri-hull boat is the traditional "V" hull with additional outside hulls. This design is more stable than the "V"-bottom at rest, but it gives a rougher ride in choppy water because of the increased surface at the bow.Tunnel boats have been designed to trap a cushion of air beneath the hull to reduce drag on the outside hulls. This design is different from a catamaran bottom because the inner edges of the outside hulls have sharp corners to improve the handling of these boats at very high speeds. Many race boats are constructed with tunnel hulls and are sometimes called "hydroplanes."Chosen Hull: Catamaran & Pontoon
Our chosen hull was the pontton design.Wese this design because it has the right amount of the renewable energy sources needed.The hull (Catamaran) design itself, is known for its speed. It is also very attractive and can be seen from far. We chose this hull because it as well looked good and also was an appropriate type of marine vessel. Our influence was two of the pictures that we saw on internet and we combined them to create our hull design.
Materials used:
-Acrylic board
-line bender
-Sails
-Wires
-Motor
-Solar panels
We chose to use these materials because we thought that the this kind of material would eb the most efficient use and the amterial was such, that even if it got wet, nothing would happen to it and the weight of acrylic sheet is not much either and so it will float well enough in the water.
Other peoples boats created influenced us to use this type of material. It was something new we tried out.
Propulsion method:
The prolusion is basically the propelling force which causes movement of a marine vessel or any other type of vehicle. The whole design influences the movement of the marine vessel for its proportional ratio compared to the force of the motor can either cause the boat to move faster or slower. The boat also needs to be streamline so it can cut through the water without any additional assistance.
Evaluate stage of DT project
Before creating our product, the hull, we had to go through various stages so that our final hull design is created well. These stages include:Investigate, Plan, Design and finally create stage.
In the investigate stage we had to research on a variety of hull designs some of which i have mentioned above and also had to write down some of the main design specifications for our hull also including the way we will test our product. All together, i think my group did a well thorough reseaech on the various hull desins and also gained alot of knowldge about the marine vessels. Some of our eaknesses were that we were not all together while doing this stage and so we had different information all together but overall i think we worked well at this stage. Our next stage was the design stage where we had to create 3-4 main designs that we had researched on throughout the investigate stage. Some of our weaknesses were that we did not have the material for desighning our products at home so we had to look for time and do it at home as well as designing the hulls we wanted on the software was hard as ell because we had never used this software before so we had to get used to using it. But afterall we did create the designs and scored full marks and that was because we worked as a team together and spent time on hte deign stage. Our other stage was planning, where we had to carry out methods to creating our product. I guess we did well in this stage as well becayuse we worked together again and put up a good plan that also helped us in our create stage. Finally, we had to create our final produvt using the materials that i have mentioned above as well as the informaion from the stages before. Here we didn't quite complete our product because of time and the design we had chosen was also a bit hard to create so that took long BUt overall, whatever we have now is a good product and is the main part of the hull. It meets most of the things that we had written in our design specification and we followed the plan and our chosen design well and created something that actully works when you float it. Overall, i think we did well on almost all the stages.
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