Installed Engine Horsepower - THRUSH S2R-H80 Flight Manual

4.4.

INSTALLED ENGINE HORSEPOWER

The first of the following four charts provides the Installed Torque Available for several ISA
values up to the maximum torque limit of 2020 Ft. Lbs. This chart was used to determine
installed horsepower for expansion of standard sea level data to various altitude and
temperature conditions for climb charts for determining at what altitude a rate of climb of
200 ft/min was reached.
The second chart provides a conversion from Ft. Lbs. of Torque to Percent Torque as
indicated in the cockpit.
The third chart provides the power output from the engine with the propeller turning 2080
RPM versus Percent Torque.
The fourth chart provides the power output from the engine with the propeller turning 1900
RPM versus Percent Torque.
EXAMPLE:
Assuming an ISA+30 degree day at a Pressure Altitude of 8000 ft., enter the Installed
Torque versus Altitude Chart at 8000 ft. and proceed horizontally until reaching the ISA+30
degree line. Then descend vertically until reading a Torque of 1840 Ft. Lbs. With the
value of 1840 Ft. Lbs., enter the second chart of Torque versus Percent Torque and
proceed horizontally until reaching the Percent Torque line. Then descend vertically to
reach the Percent Torque value of 90 percent. With the Percent Torque value of 90
percent, enter the third chart of Engine Shaft Horsepower versus Percent Torque at 2080
RPM. Proceed vertically until reaching the Shaft Horsepower line.
horizontally to the left to read an Engine Shaft Horsepower value of 725 Horsepower. This
is the power output of your engine at a propeller RPM of 2080 and a Percent Torque of 90
percent.
If a propeller RPM of 1900 is used, the fourth chart shows the Shaft Horsepower output
for 90 Percent Torque would be 660 Horsepower.
AFM H8001 SINGLE & DUAL COCKPIT Revision A
FAA APPROVAL DATE: 8/05/2014
S2R-H80 Single & Dual Cockpit
AIRPLANE FLIGHT MANUAL
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