FASTENING TOOLS 1113000 5 PRO 300 SCREWDRIVER SETS Product No. Contents Box Carton Description 7 Piece screwdriver set 1, 2 1, 2 18x3, 316x4, 1. Power to weight ratio Wikipedia. Power to weight ratio or specific power or power to mass ratio is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power to weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a vehicle as a whole, with the engines power output being divided by the weight or mass of the vehicle, to give a metric that is independent of the vehicles size. Power to weight is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance. The inverse of power to weight, weight to power ratio power loading is a calculation commonly applied to aircraft, cars, and vehicles in general, to enable the comparison of one vehicles performance to another. Power to weight ratio is equal to thrust per unit mass multiplied by the velocity of any vehicle. Power to weight specific powereditThe power to weight ratio Specific Power formula for an engine power plant is the power generated by the engine divided by the mass. Weight in this context is a colloquial term for mass. To see this, note that what an engineer means by the power to weight ratio of an electric motor is not infinite in a zero gravity environment. A typical turbocharged V8 diesel engine might have an engine power of 2. Power Tools Pro 5.2 Download' title='Power Tools Pro 5.2 Download' />The Power Mac G4 Cube is a small form factor Macintosh personal computer from Apple Inc., sold between 20. Designed by Jonathan Ive, its cube shape is. 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Powertoweight ratio or specific power or powertomass ratio is a calculation commonly applied to engines and mobile power sources to enable the comparison of one. W 3. 40 hp and a mass of 3. Wkg 0. 4. 0 hplb. Examples of high power to weight ratios can often be found in turbines. This is because of their ability to operate at very high speeds. For example, the Space Shuttles main engines used turbopumps machines consisting of a pump driven by a turbine engine to feed the propellants liquid oxygen and liquid hydrogen into the engines combustion chamber. The original liquid hydrogen turbopump is similar in size to an automobile engine weighing approximately 3. CyberLink-PowerDirector-Ultimate-15.0.2026.0-Multilingual-Direct-Link-Download.-1024x537.png' alt='Power Tools Pro 5.2 Download' title='Power Tools Pro 5.2 Download' />MW2 for a power to weight ratio of 1. Wkg 9. 3 hplb. Physical interpretationeditIn classical mechanics, instantaneous power is the limiting value of the average work done per unit time as the time interval t approaches zero. Plimt0Wttlimt0. Pavgdisplaystyle Plim Delta trightarrow 0tfrac Delta WtDelta tlim Delta trightarrow 0Pmathrm avg ,The typically used metrical unit of the power to weight ratio is Wkgdisplaystyle tfrac Wkg which equals m. This fact allows one to express the power to weight ratio purely by SI base units. Propulsive powereditIf the work to be done is rectilinear motion of a body with constant massmdisplaystyle m, whose center of mass is to be accelerated along a straight line to a speed vtdisplaystyle mathbf v t and angle displaystyle phi with respect to the centre and radial of a gravitational field by an onboard powerplant, then the associated kinetic energy to be delivered to the body is equal to. EK1. 2mvt2displaystyle EKtfrac 12mmathbf v t2where mdisplaystyle m is mass of the bodyvtdisplaystyle mathbf v t is speed of the center of mass of the body, changing with time. The instantaneous mechanical pushingpulling power delivered to the body from the powerplant is then. PK1. 2m. 2vtlimt0vttmatvtFtvtttdisplaystyle PKtfrac 12m. Delta trightarrow 0tfrac Delta mathbf v tDelta tmmathbf a tcdot mathbf v tmathbf F tcdot mathbf v tmathbf tau tcdot mathbf omega twhere atdisplaystyle mathbf a t is acceleration of the center of mass of the body, changing with time. Ftdisplaystyle mathbf F t is linear force or thrust applied upon the center of mass of the body, changing with time. In propulsion, power is only delivered if the powerplant is in motion, and is transmitted to cause the body to be in motion. It is typically assumed here that mechanical transmission allows the powerplant to operate at peak output power. This assumption allows engine tuning to trade power band width and engine mass for transmission complexity and mass. Electric motors do not suffer from this tradeoff, instead trading their high torque for traction at low speed. The power advantage or power to weight ratio is then. P to Watvtgdisplaystyle mboxP to Wfrac mathbf a tmathbf v tmathbf g where vtdisplaystyle mathbf v t is linear speed of the center of mass of the body. Engine powereditThe actual useful power of any traction engine can be calculated using a dynamometer to measure torque and rotational speed, with peak power sustained when the transmission andor operator keeps the product of torque and rotational speed maximised. For jet engines there is e be usefully calculated there, for rockets there is typically no cruise speed, so it is less meaningful. Peak power of a traction engine occurs at a rotational speed higher than the speed when torque is maximised and at or below the maximum rated rotational speed Max RPM. A rapidly falling torque curve would correspond with sharp torque and power curve peaks around their maxima at similar rotational speed, for example a small, lightweight engine with a large turbocharger. A slowly falling or near flat torque curve would correspond with a slowly rising power curve up to a maximum at a rotational speed close to Max RPM, for example a large, heavy multi cylinder engine suitable for cargohauling. A falling torque curve could correspond with a near flat power curve across rotational speeds for smooth handling at different vehicle speeds. ExampleseditEngineseditHeat engines and heat pumpseditThermal energy is made up from molecularkinetic energy and latentphase energy. Heat engines are able to convert thermal energy in the form of a temperature gradient between a hot source and a cold sink into other desirable mechanical work. Heat pumps take mechanical work to regenerate thermal energy in a temperature gradient. Care should be made when interpreting propulsive power, especially for jet engines and rockets, deliverable from heat engines to a vehicle. Heat EngineHeat pump type. Peak Power Output. Power to weight ratio. Example Use. SIEnglish. SIEnglish. Wrtsil RTA9. C1. 4 cylindertwo stroke. Turbo. Diesel engine37. W7. 00. 78. 12. 21. Wkg. 0. 0. 2 hplb. Emma Mrskcontainer ship. Suzuki 5. 38 cc V2. Otto engine41. 9 k. W7. 00. 41. 86. 42. Wkg. 0. 1. 6 hplb. Runabout boats. DOENASA0. Mod 2 5. 02 cc gas petrolStirling engine56. W7. 00. 46. 22. 65. Wkg. 0. 1. 8 hplb. Chevrolet Celebrity 1. GM 6. 6 L Duramax LMM LYE option V8. Turbo. Diesel engine12. W7. 00. 52. 46. 08. Wkg. 0. 4. 0 hplb. Chevrolet Kodiak, GMC TopkickJunkers Jumo 2. Aopposed pistontwo stroke. Diesel engine66. W7. Wkg. 0. 6. 6 hplb. Ju 8. 6C 1 airliner, B V Ha 1. GELM2. 50. 0 marine turboshaft. Braytongas turbine73. W7. 00. 73. 02. 00. Wkg. 0. 8. 0 hplb. GTS Millenniumcruiseship, QM2ocean liner. Mazda 1. 3B MSP Renesis 1. L Wankel engine81. W7. 00. 51. 84. 18. Wkg. 0. 9. 2 hplb. Mazda RX 8PWR 4. L 2. Radial engine. 3,2. W7. 00. 63. 20. 65. Wkg. 1. 1. 1 hplb. B 5. 0 Superfortress, Convair B 3. C 9. 7 Stratofreighter, C 1. Flying Boxcar. Hughes H 4 Hercules Spruce GooseWright. R 3. 35. 0 5. 4. L 1.