Definition
A power rating used for turboprop engines that combines the shaft horsepower delivered to the propeller with an additional allowance for the small amount of thrust produced by the engine's exhaust gases. The exhaust thrust is converted into an equivalent horsepower figure and added to the shaft horsepower to give a single total power value for the engine.
Plain English
A turboprop's total power, counting both the power turning the propeller and the small extra push from its exhaust, expressed as one combined horsepower number.
Context Anchor
Seen in turbine engine performance discussions, especially when comparing turboprop engine power ratings.
Derivation
‘Equivalent’ here means ‘treated as the same as.’ The exhaust thrust isn't actually shaft horsepower, but it is converted into a horsepower-equivalent value so it can be added to the real shaft power and reported as one number.
Why Pilots Care
ESHP lets pilots and operators compare total output of turboprops directly with other engine types for performance planning and aircraft selection.
Analogy
It is like counting both the power from pedaling a bicycle and an added tailwind, then expressing the combined help as one total power number.
Intuition Check
Equivalent does not mean imaginary or approximate here. It means exhaust thrust has been converted into the same horsepower units as shaft power so the two can be compared and added.
Example Sentence 1
The turboprop is rated at 1,100 ESHP, which includes the shaft horsepower at the propeller plus the contribution from exhaust thrust.
Example Sentence 2
Maintenance logs recorded a slight drop in measured ESHP after the hot-section inspection.