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N1 e hight altitude

L

lh777

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126
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italy
In the 747-100 posky maximum n1 decreases when the altitude increases. At 39,000 ft the highest n1 is 92. How can I increase it?
 
I saw the thread suggested by you, but I did not find what I was looking for. The thrust in relation to n1 is perfect. The problem is the maximum value of n1 too low at high altitudes.
 
Airwrench is excellent for creating a new air file, but it will not correct yours for this problem. The paper will tell you what needs to be done with the tables I mentioned and you could use the sample tables provided. You can edit the air file with different tools, but I use AirUpdate and check the results with AAM. These tools are free downloads. The advantage of AirUpdate is that you can construct tables with Excel and copy them into an update file.
Roy
 
Just to be clear... we are discussing corrected N1 being too low, right?
 
Corrected N1 is a value used by the simulator in calculating corrected thrust under sea level conditions. The corrected thrust is then reduced to give an actual value for whatever altitude and Mach the airplane is at. Corrected N1 at 40,000 ft should always be higher than actual N1, depending on the Mach number. Corrected N1 and Corrected N2 have no meaning outside of their role in computing actual thrust. They do not give an actual value for Engine RPM. That comes from N1 and N2, but only if CN1 and CN2 are properly calculated.

If CN1 is 92% at 40,000 ft, the air file turbine tables are drastically off.
Roy
 
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