uwochris
Flightinfo's sexiest user
- Joined
- Dec 21, 2001
- Posts
- 381
Hey guys,
Just want to get a confirmation check on the relationship between TAS and altitude, for a constant power setting.
I was under the impression that IAS is constant at varying altitudes, but TAS is not. The reason being that in the higher levels, the less dense air implies less drag for the airplane, and thus a faster TAS. So, I assumed a higher altitude gives a higher TAS for a given power setting.
However, my performance chart in my POH shows that as the pressure altitude increases, TAS decreases. Why the discrepancy?
I was told that it is because my C-172 is not turbocharged, and that TAS only increases with higher altitudes for turbocharged aircraft. This seems weird because in my POH, on the Endurance chart, it shows that TAS is higher as altitude increases for constant power settings. Again, another discrepancy.
Am I missing something??
Just want to get a confirmation check on the relationship between TAS and altitude, for a constant power setting.
I was under the impression that IAS is constant at varying altitudes, but TAS is not. The reason being that in the higher levels, the less dense air implies less drag for the airplane, and thus a faster TAS. So, I assumed a higher altitude gives a higher TAS for a given power setting.
However, my performance chart in my POH shows that as the pressure altitude increases, TAS decreases. Why the discrepancy?
I was told that it is because my C-172 is not turbocharged, and that TAS only increases with higher altitudes for turbocharged aircraft. This seems weird because in my POH, on the Endurance chart, it shows that TAS is higher as altitude increases for constant power settings. Again, another discrepancy.
Am I missing something??