Originally Posted by
RAF74_Buzzsaw
I have already told you how to keep it scientific... calculate True Airspeeds.
Second your arbitrarily setting the altitudes for testing at 7000 ft means nothing and is highly unscientific.
The theoretical altitude at which a Supercharged aircraft can obtain its maximum speed is at Full Throttle Height for the supercharger, i.e. the height at which the supercharger can maintain its rated boost.
Then you have to add Ram effect, i.e. the effect of additional pressure being generated in the supercharger venturi due to the velocity of the aircraft itself.
You arbitrarily designated 7000 feet as your testing height, and then are surprised to find the E-4B gets the highest maximum speed... it does precisely because its Full Throttle Height is at 3700 meters... closer to your designated altitude than any of the other types. The E-4B, when RAM effect is included, gets its max speed at approx. 3800 meters.
But the other aircraft you included in the comparison have different Full Throttle Heights... all of them higher than the E-4B's.
So these aircraft will get maximum speeds at higher altitudes, again, depending on their aircraft engine's FTH.
By testing all aircraft at 7000 ft, you are handicapping some of them.
Before you start throwing around tests and making claims, you really need to take some time and do research on aerodynamics, supercharged engines and how that translates into performance.
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