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Video Formulary

Video Generally
Video Axle Load Distribution
Video Payload Distribution
Video Braking Distance
Video Driving Force
Video Work/Energy
Video Radian Measure
Video Tension (brake)
Video Brake Force
Video Brake Pedal
Video Brake Force (wheel)
Video De-/Acceleration
Video Braking Distance
Video Braking Period
Video CO2 emission
Video Density
Video Torque
Video Pressure
Video Injection Quatity
Video Electrical Power
Video Riding Speed
Video Centrifugal Force
Video Gas Speed
Video Speed
Video Coaxial Gearbox
Video Lever Ratio
Video Hollow Cylinder
Video Stroke-bore Ratio
Video Displacement
Video Power Output p.l.
Video Hydraulic Ratio
Video Capacity
Video Piston Speed
Video Piston Force
Video Force
Video Crank Mechan. Forces
Video Fuel Consumption 1
Video Fuel Consumption 2
Video Fuel Consumption 3
Video Ciruit Area
Video Circuit Ring
Video Circumference
Video Clutch Pedal
Video Power (mechanical)
Video Power (effective)
Video Power (indicated)
Video Efficiency Weight
Video Wire Resistance
Video Steering Ratio
Video Volumetric Efficiency
Video Air Ratio
Video Venturi
Video Air Resistance
Video Parallel Circuit
Video Planetary Gearbox
Video Percent
Video Rectangle
Video Rectangle Column
Video Friction Force
Video Tyre Calculation
Video Serial Circuit
Video Rolling Resistance
Video Cam Dwell
Video Dwell Period
Video Slip
Video Spread of Gears
Video Climbing Resistance
Video Ratio
Video Circumference speed
Video Conversions
Video Not Coaxial Gearbox
Video Valve Opening Area
Video Valve Opening Angle
Video Valve Opening Period
Video Compression Ratio 1
Video Compression Ratio 2
Video Amount of Heat
Video Resistance
Video Efficiency
Video Cube
Video Ignition Interval
Video Cylinder

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Formulary Power (effective)

RPM and torque at the crankshaft determine the effective performance

The effective engine performance is determined on test-bench trails at the clutch or calculated on the driven wheels after subtracting the power losses occuring in the drive chain. Performance figures given for old-timers are to be treated with caution. In the American specification 'SAE-HP', the performance is determined in theory, without the cooling-fan, the cooling circuit, the generator and the back-pressure in the exhaust system. The Italian 'CUNA-HP' is not quite as optimistic, only the air-filter and the exhaust system have been left out. In both cases however, a higher performance figure than that given in 'DIN-HP' is to be expected.

The RPM reached when the highest performance is delvered, is the nominal RPM.




Check your calculation!     You need help?
Please enter numbers only in two of the three fields!
N RPM (crankshaft) rpm
T Torque (at the clutch) Nm
P Performance (effective) kW

The deriving of the constant '9550' is described here.

The horsepower unit (1 'HP' = 0,736 kW) as a performance measure, is completely outdated. It describes the continous performance of a horse. Over a short period, suitable specimens are able to produce way over 20 HP.

Modern rocket: 19 million kW (26 million HP)               Top of page               Index
2001-2014 Copyright programs, texts, animations, pictures: H. Huppertz - Email
Translator: Don Leslie - Email:

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