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When speed above Vmax, engine thrust is always smaller than air drag force.
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Right...
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When speed above Vmax, engine thrust is always smaller than air drag force.
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Correct.
You getting lost in the trees Blackberry and cannot see the forest.
Maybe if you go back to my very first post, it will help you to gain a better understanding. You understand what is going on with the actual forces but do seem to be able to recognize it in the math.
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The difference between the force on the axis of motion in the dive and the force on the axis of motion for level flight is your initial excess force that will move the aircraft to its new equilibrium point velocity. The derivative between that and equilibrium is your average excess force along that vector....
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http://forum.1cpublishing.eu/showpos...3&postcount=98
At Vmax, that initial excess force is composed entirely of a component of weight.
We don't have to break anything down. The detail is already there in our calculations. To determine aceleration, we need the amount of excess force along our vector of motion. It is that excess force that causes the aceleration.
If we start our dive at a velocity below Vmax, then our initial thrust force is the difference between that specific velocity propeller thrust and zero at Vmax. Then we add the additional component of weight that shifts to thrust.
The derivative between that and equilibrium is your average excess force along that vector...
Your argument that your game would benefit from a more "detailed" propeller model such as Blade Element Theory in dive performance is not valid.
You are confusing the mathmatical process of summing the forces with what is actually going on with those forces in a moment in time.
We have already considered that moment in time when we determined our derivative.