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Spark Ignition Aircraft Engine Endurance Test of Aviation ... - FAA

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Figure 21. Corrected Power and Average EGT vs Air-to-Fuel Ratio at 26-in. Hg and 2600 rpm<br />

Figure 22. Corrected Power and Average EGT vs Air-to-Fuel Ratio at 24-in. Hg and 2400 rpm<br />

Figures 23 through 26 show the same data from figures 19 through 22 plotted versus equivalence<br />

ratio instead <strong>of</strong> air-to-fuel ratio. The equivalence ratio is a measure <strong>of</strong> the stoichiometric air-t<strong>of</strong>uel<br />

ratio to the actual air-to-fuel ratio. The stoichiometric air-to-fuel ratio is the ratio where<br />

22

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