Just one thing... why are you keeping engine on max power after final speed is achieved?
I'am very confused with that. There is no point on throwing energy away, you will actually be charging the system, instead of increasing speed.
The big problem with any propeller is it's final speed. You could still accelerate, because your frame is damn good, but the propeller is a huge hindrance at high speeds. Also, keeping the throttle at full power at 900Km/h seems preposterous!
If you keep your engine at max power until the end of a dive, I will tell you that if there is a bug, it is with the planes that won't overheat, and they all should get engine damage. Check the RPM's of both planes and see the difference, but I doubt you will gain nothing by keeping the throttle at max power to the end of the dive.
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