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Author Topic: Performance curves between 10k-20k  (Read 305 times)

Offline Anaxogoras

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Performance curves between 10k-20k
« on: December 18, 2007, 02:17:59 AM »
Looking at the graphs for the speeds of various aircraft in AH at different altitudes, there's an interesting trend between 10k ft and 20k ft:  performance often drops considerably after 10k ft, but then curves up again after 15-20k ft.

What's the explanation?  Is it something about superchargers?  I don't doubt the accuracy, I'm just curious.:confused:

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P.S. I'm looking here http://gonzoville.com/ahcharts/index.php

Examples include the P-51D, Fw-190A series (between 5-10k),  and Typhoon.
« Last Edit: December 18, 2007, 02:24:07 AM by Anaxogoras »
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gavagai
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Offline Wolfala

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Performance curves between 10k-20k
« Reply #1 on: December 18, 2007, 03:18:31 AM »
Supercharger stages, some have low blower, high blower, then some are turbo-supercharged like the P-47 and have a constant amount of power up into the flight levels. All depends how the integration with the airframe turned out.
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Offline Anaxogoras

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Performance curves between 10k-20k
« Reply #2 on: December 18, 2007, 11:35:45 PM »
Ok, I did notice that the P-47 and 109 airspeeds improve with altitude regardless.  There are others as well that have a performance gap.

Anyone who flys aircraft that suffer a gap between 10-20k should definitely keep it in mind when they encounter aircraft that don't.
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gavagai
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