Quote:
Originally Posted by Bolelas
Not a question about the game itself, but as real life aircraft behaved: In a dive, in a over-rev situation (lets say i cut throttle but forgot to pitch back), does the plane heat the same way as if i was adding more fuel? (with less pitch). I know compressed air heats, plus there is fuel going in (the idle fuel), and also friction, but should it overheat slowly?
Hope you people can understand question, because it is a little confusing.
I have not much knowledge about engine, just what i read in foruns, books etc. Also in the spitfire manual it says that in a dive they could do a little over-rev, but had to add at least one third of throttle : Was this to lubbricate pistons?
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Over-revving any engine is very, very bad for it. It creates a lot of heat very rapidly (mostly from friction, not combustion), and it pushes parts of the engine far beyond what they were designed to work at.
Some common failures include piston rods breaking ("throwing a rod"), cam and crankshaft bearings rapidly being burnt out and seizing up, valve heads colliding with pistons, etc. Even if everything manages to hold together, it can also cause critical "soft" components like gaskets to fail, which may not cause an immediate seize-up but could cause other things to fail in a chain reaction.
It's very complicated and I don't pretend to understand the actual ways and means of doing it, but calculating a particular engine's red-line rev rating is done based on it's design. Beyond that red-line the probability of partial or total failure rapidly goes up to where it's essentially guaranteed.
Lastly, keep in mind this was almost 80 years ago. Aeronautics was a very young field and technology was pushing boundaries once held to be insurmountable. Warbird engines were pushed to their absolute limits and designed to run at just below those with minimal safety cushions. Overspeeding your prop and motor will invariably give you those really bad results, and the game seems to do a great job of simulating that as best as it can.
Hope that helps.