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climb performance Jet vs Prop



 
 
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  #11  
Old July 7th 06, 12:12 AM posted to rec.aviation.piloting
xerj
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Posts: 31
Default climb performance Jet vs Prop

"The problem is that this analysis assumes constant thrust. I've seen
nothing to indicate that, as a rule, jet engines maintain constant thrust as
altitude increases"

The thrust definitely decreases with altitude, but it is constant across all
speeds at the same altitude. Unlike a power available curve, it is a
straight line.

The drag curve shifts to the right with altitude, indicating that the TAS
for minimum gets higher. The thrust line moves down towards the drag curve
as altitude increases, but the point where the biggest difference between
the two occurs is the same IAS.


  #12  
Old July 7th 06, 06:31 AM posted to rec.aviation.piloting
Peter Duniho
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Posts: 774
Default climb performance Jet vs Prop

"T o d d P a t t i s t" wrote in message
...
The constant thrust assumption only needs to apply with
respect to changes in speed at a fixed altitude, not changes
in altitude.


Okay...I get it now. Except for the other post that points out that thrust
is *not* constant even at a given altitude.


 




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