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Why 400mph IAS ? Why not any other number?
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It's very common to dive to 400-450MPH IAS for WWII late aircrafts such as P51, P47,Tempest, fw190, etc.
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Prop planes can't break sonic barrier so it's not that important for Il2 to have highly detailed Mach model.
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Prop planes can't break sonic barrier, but Prop planes' propeller CAN often break sonic barrier in a dive, it's an unfortunate fact for il2.
As early as 1904 when Wright brothers made the first a/c, they knew both airscrew and wing are "same thing".
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The twisted airfoil (aerofoil) shape of modern aircraft propellers was pioneered by the Wright brothers. They realised that a propeller is essentially the same as a wing, and were able to use data from their earlier wind tunnel experiments on wings. They also realised that the angle of attack of the blades needed to vary along the length of the blade, thus it was necessary to introduce a twist along the length of the blades. Their original propeller blades were only about 5% less efficient than the modern equivalent, some 100 years later.[2]
http://en.wikipedia.org/wiki/Propeller_(aircraft)
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Their original propeller blades were only about 5% less efficient than the modern equivalent, some 100 years later.........
That conclusion is based on low Mach data, for supersonic airscrew, the story is totally diefferent.
In my opinion, the airscrew theory/simulation is the weakness of il2's FM.
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It does? Maybe, depends which models you take for comparison .
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Tempest MKV 9lbs boost outdives P51B(Mustang III) 18lbs boost.
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Dive
For the same reasons as the zoom climb, the Tempest pulls ahead. As the speed is increased it does so more rapidly. The fact is it has the best acceleration in the dive yet seen at this Unit.
http://www.hawkertempest.se/TacticalTrials.htm
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Speed and acceleration in the dive is an essential quality to a successful fighter, but a decisive conclusion on the order of superiority is largely dependant on throttle settings, and the maximum speed in straight and level flight of the individual aircraft. Here again, however, by carrying out a number of tests under different conditions, it is reasonable to assume that the Meteor is well ahead of its rivals, followed by the Tempest, Thunderbolt, Mustang and Spitfire in that order.
http://www.wwiiaircraftperformance.org/sl-wade.html
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