Riblets and Tripwires and their Role in Reducing Drag over Underwater Aerofoils

Drag is a mechanical force, It is generated by the interaction and contact of a solid body with a fluid (liquid or gas).For drag to be created, the solid body must be in contact with the fluid. If there is no fluid, there is no drag. Drag is generated by the difference in velocity

They do this because of the limited amount of space on the ship. Shark liver oil is used as a source of vitamin A, and some people believe that the cartilage and liver of a shark are extremely beneficial to human health. In earlier days the sharks' teeth-like scales on their skin was used as fine sandpaper, and when the scales were removed from their skin it made fine leather. This leather was used for making shoes, belts and handbags. Each year thousands of sharks are killed unintentionally due to nets used to catch different types of fish, and sometimes humans kill sharks because they fear them (Springer and Gold, 1989). All of these activities have resulted in many shark species being in danger of extinction.

The objective of this exercise is to measure the pressure distribution across the surface on an aerofoil in a wind tunnel. The aerofoil is tested under several different Mach numbers from subsonic to supercritical. The purpose of measuring the pressure distributions is to assess the validity of the Prandtl-Glauert law and to discuss the changing chracteristics of the flow as the Mach number increases from subsonic to transonic.

4.1 “What a Drag” lab tested 5 different surface areas; Tabletop, Waxed paper, Paper towel, Fine sandpaper,and Coarse sandpaper. These 5 different surface areas caused the weight to appear different . The data shows that it increases each time you do it again. Each time you pull the block over the 5 different surfaces it can increase or decrease.

In the article, they came up with the idea of gelling agents which is a chemical used to solidify any kind of spilled oil, making it easier to collect. Using the motion of the waves and sea, the gelling agent turns the oil into a rubbery material that can be easily removed from the water with nets, vacuuming, suction, devices or skimmers. This method helps clean the water without taking a lot of the water with it since when it solidifies you just pull out the chunks of oil instead of taking a lot water with it like if you were to try the hay or fleece

Drag Racing is a complex process that actually involves a lot of physics. Newton’s Laws explain a few concepts about Drag Racing. Newton’s Second Law is important in drag racing; this states that anything with mass, like the car, with net force acting on it will accelerate. This portrays the tires, which are said to be powered by the engine, grip the ground and make the car move forward. Newton’s Third Law, every force has an equal and opposite force, explains the idea of friction, and how that affects the vehicle as well. Wind Resistance is another thing mentioned when it comes to Drag Racing. Wind resistance exponentially increases as you increase your speed, for example, if you are at a speed of 30 and exceed to 50,your resistance would

In this experiment, the velocity profile for a flat plate at zero pressure gradient of a boundary layer at two different stream wise points were acquired. The investigation was also based on and how changes in Reynolds number affect the velocity distribution within boundary layers. Parameters such as the Momentum Thickness, Displacement Thickness, Shape Factor, shear stress and coefficient of friction was also calculated to gain a better understand of boundary layers. The experimental values calculated were compared to the theoretical Blasius for laminar flow and Power Law Solutions for turbulent flow to see how they varied. It was found out the higher the Reynolds number the greater the boundary layer thickness. As the

Supplying rocket-controlled hydro airplanes hustling around hemorrhaging side tracks over a all-natural and also vibrant water surface area, Riptide Gp2 hands down a vigorous, enjoyable, and also seemingly sensational rushing structure.

In this experiment in a low speed flow the static pressure around an aerofoil will be observed and discussed. The lift on the aerofoil will also be calculated and compared with the theoretical value. The aerofoil being used in this particular experiment is symmetrical and is taking place in a wind tunnel with a speed of 18.5m/s, therefore the flow is assumed to be incompressible. The different pressures along the surface of the aerofoil will be measured at an angle of attack of 4.1 degrees and 6.2

The following report is based on an experiment conducted to calculate the lift curve slope for a symmetrical aerofoil subjected to varying angles of attack. Pressure readings were taken at different points on the upper and lower surface of the aerofoil. The report concludes that maximum lift is generated between 12 º -15º, which is also the stall point. It also states that region close to the leading edge contributes most to the lift force.

For the risk-free rate (rRF) we used the yield for a 20-year treasury bond in 2002:

     Drag force is the cost of increasing downforce. Drag force is the force acting on an object in motion in the opposite direction the object is moving through a fluid (Yager). To most people drag force is simply known as air resistance. The objective of aerodynamic efficiency is to maximize downforce while minimizing drag force.

This report aims to investigate the effect the angle of attack of an aerofoil has on the air flow around it. This was done by recording the lift and drag forces the aerofoil experienced when positioned at different angles of attack. The experimental lift force the aerofoil experienced when positioned at different angles of attack was then compared with theoretical values. An attempt was made to explain any discrepancies between experimental and theoretical values.

The common explanation given to those curious about how an airplane wing produces lift uses the Bernoulli Principle. This is the concept that because of the airfoil shape of a wing, the air traveling over the top of the wing must travel faster than the air going under the

The purpose of this module is to investigate hydrostatic forces on a plane surface under partial and full submersion.