Hi all,
15 years back, there was a topic created on this subject. Apparently, the formula for calculating N1 based on the Flex Temp is
Reduced N1=Full N1 × square root of (ambient temp/Flex Temp).
*Both temperatures are to be expressed in Kelvin.
Can anyone here explain what "full N1" means? I have a feeling that it isn't simply "100".
Thanks!
Moderators: richierich, ua900, PanAm_DC10, hOMSaR
Re: Relationship between Flex. Temp and N1
Not necessarily 100. When we talk about N2, we talk about the percentage of the ISA rated N1 (fan speed). Given the ambient conditions, that may be more or less than 100%. I am not certain if the baseline 100% N1 value takes into account the bleeds being open/closed. I know on the CRJ 100/200, under normal conditions, it will not hit 100%. Why in specific I don't have the actual answer. I assume it is due to the normal use of 10th stage bleed air for pressurization. Next time I'm in the sim, I'll give it a try unpressurized and 14th stage bleeds closed (wing/cowl anti ice bleed air source).
Re: Relationship between Flex. Temp and N1
Exoderpyish wrote:Hi all,
15 years back, there was a topic created on this subject. Apparently, the formula for calculating N1 based on the Flex Temp is
Reduced N1=Full N1 × square root of (ambient temp/Flex Temp).
*Both temperatures are to be expressed in Kelvin.
Can anyone here explain what "full N1" means? I have a feeling that it isn't simply "100".
Thanks!
What aircraft what engine ?
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- Exoderpyish
- Posts: 2
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Re: Relationship between Flex. Temp and N1
What aircraft what engine?
CFM56-5B1-2 on the A321