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Engine Performance

Correcting the table for variation from Standard Temperature:
  • At ISA +15° C (ISA +27° F) the performance values fall by approximately 3% of the power selected according to the below table. 
  • At ISA -15° C (ISA -27° F) the performance values rise by approximately 3% of the power selected according to the below table.


 Engine Power as % of Max. Take-Off Power
45% 55% 65% 75%
RPM: 1800 2000 2200 2400 2000 2200 2400 2000 2200 2400 2200 2400
Best Economy fuel flow: 5.8 6 6.3 6.6 7 7.2 7.5 7.9 8.2 8.5 9.2 9.5 
 Best Power fuel flow: - - 7.3 7.7 - 8.5 8.7 - 9.5 9.8 10.7 11
ISA [°C] [°F] Manifold Pressure (MP) [in Hg]
MSL 15 59 22.7 21.3 20.2 19.0 23.9 22.4 21.2 26.8 24.9 23.4 27.3 25.8
1000 13 55 22.4 21.0 19.9 18.7 23.6 22.2 21.0 26.4 24.5 23.2 26.8 25.5
2000 11 52 22.1 20.7 19.6 18.4 23.3 21.9 20.7 26.0 24.2 22.9 26.5 25.2
3000 9 48 21.8 20.4 19.3 18.2 23.0 21.6 20.4 25.7 23.8 22.6 26.1 24.8
4000 7 45 21.5 20.2 19.0 17.9 22.7 21.2 29.1 25.4 23.5 22.3 - 24.5
5000 5 41 21.2 19.9 18.7 17.6 22.3 20.9 19.8 - 23.1 22.0 24.1
6000 3 38 20.9 19.6 18.4 17.4 22.0 20.6 19.5   22.8 21.7 -
7000 1 34 20.5 19.3 18.2 17.1 21.7 20.3 19.3   22.4 21.4    
8000 -1 31 20.2 19.0 17.9 16.9 21.3 20.0 19.0   - 21.0    
9000 -3 27 19.9 18.7 17.6 16.6 21.1 19.7 18.7     20.7    
10000 -5 23 19.6 18.4 17.3 16.3 - 19.4 18.4     -    
11000 -7 19 19.3 18.2 17.0 16.1   19.1 18.1          
12000 -9 16 - 17.9 16.7 15.8   - 17.8          
13000 -11 12   17.6 16.4 15.5     17.6          
14000 -13 9   - 16.1 15.3     -          
15000 -15 6     15.8 15.0                
16000 -17 2     15.5 14.7                
17000 -19 -2     - 14.5