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Originally Posted by fish314 Maybe I can shed some light here...
For this reason, best angle of climb occurs at a slower airspeed than the minimum drag speed in a prop. However, the shift in Vx in a prop (Vx increases as altitude increases) occurs for the same reason as it does in a jet. Less parasitic drag at a higher altitude means you get less drag at a faster airspeed.
Therefore Vx increases with altitude because parasitic drag decreases due to decreased density. That means the point of minimum total drag occurs at a faster airspeed.
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This is exactly what I've been trying to validate. Most texts will not delve into this.
Good job.