LEEVENSPARK

Limited-Slip Differential A differential does not provide a high mechanical efficiency, which is desirable for the majority of mechanical components. Even if a 'low friction' differential with reduced traction over slippery surfaces is fitted, it limits acceleration of a high-power vehicle and causes excessive tyre wear. The torque reaction of the engine of such a vehicle, during acceleration, tends to lift the left-hand driving wheel off the ground. When accompanied by an uneven road surface, this causes excessive wheel spin. To minimize these drawbacks, the differential action is counteracted by artificially increasing the friction between the sun wheel and the differential cage. When this feature is included, it is called limited slip differentials. Two basic types of limited slip differential are : • Mechanical limited-slip differential  • Visco-differential Fig. 26.46. Final drive assembly with limited slip differential   Mechanical Limited-slip Differential Figure 26.46 i

Differential Lock In a two-wheel drive vehicle if one driving wheel loses adhesion, the propelling force is considerably reduced. This results in the immobilization of the vehicle so that the differential action becomes undesirable on the vehicles designed to operate over poor surfaces. This action can be prevented by locking together any two individual units of a differential. One such arrangement is illustrated in Fig. 26.45. A sliding dog clutch member is splined to a differential sun wheel, which engages with dog teeth formed on the cage of the differential. The clutch is engaged by means of a fork, which can be moved by a lever fitted on the outside of the axle. When engaged, the sun wheel, and hence the rear wheel connected to this sun gear, is made to turn at the same speed as the cage. Locking one sun gear to the cage in this way ensures that the other sun gear also turns at the same speed. Fig. 26.45. Differential lock

Work Safe with Computer Are you spending a lot of time sitting at the computer, doing school work or playing games? Working with a computer for long hours can affect different parts of the body, like our hands, wrists, back, and eyes. If you want to keep these parts as healthy as possible then you have to take some precautions. Sitting Square in Your Chair: One of the most important things you should do at the computer is sitting in your chair. This means keeping your body straight when you’re sitting with your behind in the center of the seat. Your legs should come out straight with your knees and your feet don’t reach the floor, use a footrest. Your back should be touching the seat back the keyboard while you type. And if you can use a seat that has a support for your lower back, that’s even better. Typing time: And speaking of typing: you don’t need to hit those keys very hard to type. A light touch will do the job. While you’re typing, make sure your fingers don’t have to

V-2 rocket engine drawing showing the different stages of the air missile.

The above seeing image is a sound speed planes which is designed with a twin supersonic engines after the servive of the plane which is displayed in the Astronomical Space museum in united states of america The above image shows the black bird supersonic plane which is used for the u.s air force in 19th centruy that the plane travel with sound speed above mach 3 which is displayed in the american muesum. The plane is also called as SR-71 which is the model name of the plane. [ click on the images to get the high resolution view of the picture ] 

Liberator On display at the West Point museum is an example of the “ Liberator ” pistol mass produced during World War II. Little more than a stamped-metal “ zip gun ” the idea was to produce at minimal cost the minimal firearm capable of putting down an enemy soldier.  It was a one-shot weapon ( with storage in the grip for a few extra rounds ), not intended for combat use. Instead, the idea was that it would be airdropped to partisans across Europe, who would use it to cap Axis soldiers… and then take *their* guns. Relatively few of the millions produced still exist; fewer still were actually used. They came packaged in a carboard box with a cartoon instruction sheet. A wooden dowel rod was also included to help the shooter eject a spent cartrige. Given its limited practical value, they are really rather pricy, and if you find a boxload of ‘em, scrapping them for the steel would be a really, really bad idea.

Thread For Aeronautical Students [Text Books ] Engineering Mathematics http://www.4shared.com/dir/3693220/d...thematics.html Engineering Mathematics by J.Bird (2003) [3.79MB] http://rapidshare.de/files/21051025/...__4th_ed._.rar Fluid Mechanics Fluid Mechanics by FM White http://rs16.rapidshare.com/files/2317035/White.rar An Introduction to Fluid Dynamics by G.K.Bachelor http://depositfiles.com/en/files/1001654 Aerodynamics and Flight Mechanics E-Books http://www.4shared.com/dir/3691758/3...odynamics.html Aerodynamics for Engineerng Students by E.L.Houghton (2002) [9.21MB] http://rapidshare.de/files/21089629/...__5th_ed._.rar Applied Aerodynamics Education by Devenport Mason [0.19MB] http://rapidshare.de/files/22492513/...aa-98-2791.pdf Aerodynamics, Aeronautics and Flight Mechanics by McCormick [3.43MB] http://rapidshare.de/files/22492628/...an_p1-179_.pdf Missile Aerodynamics by J.N.Nielson (1960) [19.87MB] http://rapidshare.de/files/22493320/...Hill_1960_.