Maximum Climb Rating (Turboprop): Standard Day

Figure 10.43a shows the uninstalled maximum climb SHP in nondimensional form and fuel consumption (sfc) up to a 30,000-ft altitude for four TAS from 50 to 200 kts. Following the same procedure as described in Section 10.11.4, the available installed thrust and fuel-flow rates at the maximum climb rating are worked out using a 4% loss of thrust due to installation effects. A sample computational table at a 30,000-ft altitude is in Table 13.2.

Figure 13.6 plots the available installed thrust and fuel flow at the maximum climb rating from sea level to a 30,000-ft altitude. The specified requirement of the initial climb rate for the example in this book is 4,500 ft/min.

Maximum Cruise Rating (Turboprop): Standard Day

Figure 10.44 shows the maximum cruise SHP in nondimensional form and fuel con­sumption (sfc) for speeds from the TAS of 50 to 300 kts and an altitude up to

Altitude ft

Figure 13.7. Thrust and fuel flow at maximum cruise rating 30,000 ft. Progressing as in the climb performance, the maximum cruise thrust and fuel-flow rate can be computed. A sample computation at a 30,000-ft altitude is in Table 13.3 using a 4% loss of thrust due to installation effects.

Figure 13.7 plots the available installed thrust and fuel flow at the maximum cruise rating. The initial maximum cruise speed in the example is 320 mph (270 kts) at a 25,000-ft altitude.

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