🔍 Key Concepts
• Relationship between P L A N / 33,000 and indicated work in an engine cylinder
• Definitions of IHP (Indicated Horsepower), BHP (Brake Horsepower), SHP (Shaft Horsepower), and BMEP (Brake Mean Effective Pressure)
• How mean effective pressure, piston area, stroke, and RPM relate to power output
đź’ Think About
• Ask yourself: Does this formula use cylinder pressure, piston area, stroke, and number of power strokes to find power developed inside the cylinder or delivered at the shaft?
• Which of the four choices is measured at the indicator diagram in the cylinder, and which are measured at the crankshaft or propeller shaft?
• How is mean effective pressure usually represented in formulas: as a pressure term alone or as part of a power equation that includes a constant like 33,000?
âś… Before You Answer
• Identify which term refers to power developed in the cylinder rather than at the shaft or propeller
• Confirm that 33,000 in the denominator is the number of foot-pounds per minute per horsepower
• Verify which of the four options is directly calculated from P (mean effective pressure), L (stroke), A (area), N (number of power strokes per minute)