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#11
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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
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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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