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Mechanical Engineering
Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.
10,989 Questions
Why is there slits on a hovercraft's skirt?
there are 3 types of skirts on hovercrafts: The bag skirt, the finger or segment skirt and a combo, the bag and finger skirt.
You are talking about the finger skirt.
The finger skirt is comprised of a large number of separate segments which are able to slide and bellow individually to conform with the shape of the water surface or terrain over which the craft is traversing.
The fingers should not be sewn or connected together in any way or else the design of the skirt which is to form a very flexible air seal between the hovercraft and terrain, will be defeated. To achieve this, the fingers should only be attached to the craft by a rigid strip along the upper edge and by some from of corner tie at the two innermost apexes. The straight finger serves well as a bow skirt due to the advantageous receding angle of attached which helps in riding over waves and ground undulations and at keeping frontal spray and dust to a minimum. The straight finger however, is very unforgiving to being dragged backwards over obstacles. The extended finger is best used at the side and rear of the hovercraft as it has a better obstacle clearing characteristic and also its design helps to maximize the effective cushion area because the ground contact point is much further out towards the hull perimeter than for that of the straight finger.
The inner fact of the finger skirt is completely open which means that apart from a very marginal increase in pressure due to the peripheral jet stream, is a very soft and flexible with only actual cushion pressure holding it firm. This is vastly different to the bag skirt which has a peripheral pressure much greater than cushion pressure. The finger skirts at the rear of the hovercraft must be equipped with either a single anti-scoop flap or for improved flexibility, individual strips may be sewn to the inner edges of each finger which extend out belong the ground contact point. This reduces their efficiency in retraining cushion air from escaping, but unfortunately is quite essential if the hovercraft is to be used anywhere than over smooth terrain.
CHARACTERISTICS OF THE FINGER SKIRT
The straight finger skirt is easy to design and construct and repair work is also easy because of the small size of each segment. The extended finger however is a little more difficult to design.
The finger skirt, straight or extended, gives a very smooth ride and has a low friction characteristic and so long as the cushion height is adequate, is ideal for traveling at high speed over waves and rough ground. Apart from the rear fingers which should have an anti-scoop flap, a hovercraft with a finger skirt does not trap water like a bag skirt at lift off. An extended finger uses a great deal more material than a straight finger or bag skirt and for this reason, it has become common practice for the expensive low friction neoprene coated fabric to be used only on the knuckle which constantly rubs across the on-coming waves and for less expensive non-coated fabric to be used on the bellow and sides of the finger.
What type of math is used in industrial design?
Geometry is the key math used in industrial design. Algebra and calculus provide help with triangles, lengths and angles often used to design.
PV=nRT P is the pressure that you are looking for V is the volume of the vessel (74.48ft3) R is a constant. look it up. (10.7316 ft3 psi/R lbmol) 4 cubic meter of air is the amount of moles that you have (n) (.026853 cubic meters is 0.0026412Lbmole) this is 0.393430901 lbmol I will assume the air at 120 degrees F that is = 579.7 degrees Rankin P= (.39)(10.7316)(579.7)/74.48ft3 P= 32.57 psi
Show me step by step instructions to make a newton scooter?
Take a piece of wood or any-thing and shape it into any transport and chose your mode of movement.
A beam is a crossbar of a balance, a large piece of timber or iron, a horizontal timber of a building, or a ray or collection of rays of parallel light.
What are some facts about shearing stress?
in this stress the force acts parallel to the area on which the stress is measured.
microscopically what takes place is that the material is made of several planes and during the shear stress the planes slip over each other like a pack of cards until finally failing.
Dimensions for a 15 KT windsock?
3.2.2 Dimensions. The minimum effective length and the throat end opening diameter of the fabric windsock are as follows: a. Size 1 ‑ Eight feet (2.5 m) in length and 18 inches (0.45 m) in throat diameter. b. Size 2 ‑ Twelve feet (3.75 m) in length and 36 inches (0.9 m) in throat diameter. The taper or the fabric windsock from the throat to the trailing end must be designed to cause the windsock to fully extend when exposed to a wind of 15 knots (28 km/hr or 17 mph).
What is the difference between transverse lateral and longitudinal directions?
what is difference between lateral and longitudinal?
What is a free flow exhaust system?
it is an exhaust system installed in trucks to make you have better gas mileage. it increases your mpgs at least 5 mpg. it usually is not used in cars because there aren't many places under the hood that it can be stored. In trucks, it is installed above the engine, but you can also store it inside of other gaps throughout the engine. Cars dont have large gaps in their engine, so it cant be installed in there. Other than increasing your gas mileage, it also makes it run quieter.
In regards to the above answer.........that is not really accurate.
Actually, A free flow exhaust is a type of system installed in vehicles for increased power and a sporty look.
They are designed to remove engine emissions more efficiently than standard exhaust systems.
Free flow exhaust systems are designed for looks and increased efficiency and power in vehicles.
They are typically made of 100 percent stainless steel, which offers a nice sporty look.
They weigh less than standard exhaust systems, which helps account for increased fuel economy and improvement in acceleration.
Exhaust systems are used for removing spent gas from a vehicle's engine; therefore exhaust systems play a role in engine tuning and performance.
A free flow system allows the spent gas to exit the vehicle more efficiently by changing the pipes used in the system and installing an inter-cooler between the engine and the exhaust.
With a free flow exhaust system, a smoother removal of spent gas is offered. Because of this, vehicle owners notice an improvement in the overall way their vehicle runs.
These systems promote better gas mileage and increased acceleration as well.
Transients can be currents or voltages. They occur momentarily and fleetingly in response to a stimulus or change in the equilibrium of a circuit.
Is there any table or formula for relationship between pipe class and pipe schedule?
Please visit below address.
http://www.aquatext.com/tables/pipepres.htm
What are reasons for over speed tripping of steam turbine genarator in a combined cycle power plant?
wHAT??
What is solar air conditioning?
Solar air conditioning refers to any cooling system that uses solar power. It plays an increasing role in energy-plus buildings and zero-energy design which is used in demonstrating and developing new technology innovations.
What is the density of marine grade plywood?
Marine grade plywood has a density of 300 to 400 kilograms per cubic metre, depending on the type.
( I found this answer on google inside 20 seconds, by the way. Learn how to use the web, guys!)
What are the characteristics of titanium?
Answer Titanium is a great alternative for structural material in terms of weight and strength. Titanium is lighter than Steel and much stronger than Aluminum. It has a low heat transfer rate, which makes it useful for high-heat applications. The one major draw-back with titanium is that it retains heat during maching of part during manufacture due to its low heat transfer rate. Titanium has to be machined at 1/5 the rate of steel, even with plenty of coolant applied to the cutting tool. This is one reason a Titanium part is more expensive; if it takes 5 times longer to machine a part, it will be 5 times more costly. The other reason is that Russia has a monopoly on the titanuium resources. Someone asked me which part would be lighter if made for the same load: Steel, Titanium or ALuminum. I analyzed a simple rod under an axial load and determined the minium size of the optimized rod then calculated its weight. The Titanium rod came out 1/3 lighter than the Steel rod. For bending or other load applications, this ratio will vary. The strength ratio can easily be found by ratioing the Young's Moduls and the unit weight. Fatigue-- A few years ago, Titanium did not have very good fatigue properties. The standard titanium alloy was Titanium 6Al-4V. The fatigue S/N curve of this alloy is very steep; it does not flatten out at the higher cycles as Steel S/N curves will do. However, new alloys have been developed that have much better fatigue properties.
What is the definition limition?
The word limitation means there is a restriction to something. If you cannot swim, you may have limitations when it comes time for a family reunion at the lake.
Define elasticity and flexibility?
An object is said to be elastic if it has the ability to return to it's normal state after being stretched or squeezed. Flexibility on the other hand is the ability to bend easily without breaking.
With zero nose radius, the leading cutting corner of the HSS (high speed steel) cutting tool comes to a point. Cutting a surface with a pointy tool gives a non-smooth surface finish. Also, when cutting steel, tremendous pressures are generated at the tool tip. A tool tip that comes to a point is weak at the point and the tip can fracture easily. Unfortunately, this tool fracture makes an uncontrolled, new shape on the cutting edge that often wears really fast, and/or leaves a bad surface finish on the part. With a 2mm nose radius, instead of coming to a point, the cutting edge of the tool is rounded. One result is the same difference you would get in smoothing frosting on a cupcake with the tip of a knife (sharp tip) and smoothing the frosting with the end of a spoon (rounded tip). The rounded tip gives a far smoother surface finish. Also, instead of all of the force being pressed against a sharp tip, the 2mm radius distributes force across a wider edge, making a far stronger tool tip that won't break down nearly as readily as a sharp tip would.
Why dont you have to use coolant while machining cast iron?
As far as i know, coolant is not required while machining cast iron because, carbon in cast iron is present in the form of graphite (which is a cooling agent - self cooling). Moreover the carbon content is high in cast iron.
What are the parts and components of a cordless electric drill?
There are only a few parts and components that separate a cordless electric drill from a corded electric drill. Having a battery instead of a cord is the biggest difference.ÊÊ
It is a good low temp gas to replace R12. Also known as 401A is a blend of refrigerants (22-152A-124). It is a good low temp gas to replace R12. Also known as 401A is a blend of refrigerants (22-152A-124).
What is selection criteria for relief valve?
The selection criteria for relief valves is based on a number of factors. Some of them include size, design and the operating characteristics among others.Ê
