Oil temp threshhold for engine breakage? (Mainly Merlin engines)

[bongodriver]

probably around 23000' in a descent to 17000' by the time I started taking the Sion pics.

[Al Schlageter]

Nice to see a commercial pilot that actually puts his commercial license to use.

[Crumpp]

es. I totally agree with that, heat exchanger physics explain heat exchange.
Today 10:43 AM

Good, then what the heck is all the other nonsense about it does not apply to certain airplanes under certain conditions!!?

Learn something from you?......I doubt it.

I thought you were going to post some pictures on the temperatures differences for us. I see you backed off that one.

[Al Schlageter]

When are you going to list the 16 squadrons that were the only squadrons to use 100 octane fuel during the BoB?

Must be like the Fw190s that were at Stalingrad in the late fall of 1942.

[JtD]

Originally Posted by Crumpp

Good, then what the heck is all the other nonsense about it does not apply to certain airplanes under certain conditions!!?

Never said that. Physics always apply. I said:
- basic principles of heat exchangers don't fully explain general aircraft engine oil temperatures
- general aircraft engine oil temperature characteristics don't fully explain Spitfire specific oil temperatures

That means, while it is comparatively easy to estimate the heat exchange in the radiator for a given set of conditions, this is just one piece of the puzzle of oil temperature calculation.

[Igo kyu]

Did they know about the counterflow multiplier in WW2?

http://en.wikipedia.org/wiki/Countercurrent_exchange

It makes a huge difference to efficiency.

In a 1951 lecture along with his student V.B. Hargitay, he was the first to hypothesize the countercurrent multiplier mechanism in the mammalian kidney, later to be discovered in many other similar biological systems.

http://en.wikipedia.org/wiki/Werner_Kuhn

So, perhaps not?

[NZtyphoon]

Originally Posted by JtD

Never said that. Physics always apply. I said:
- basic principles of heat exchangers don't fully explain general aircraft engine oil temperatures
- general aircraft engine oil temperature characteristics don't fully explain Spitfire specific oil temperatures

That means, while it is comparatively easy to estimate the heat exchange in the radiator for a given set of conditions, this is just one piece of the puzzle of oil temperature calculation.

Other aspects to be considered: coolant used; efficiency of coolant flow; thermal efficiency of engine/engine components, mechanical efficiency of same, etc etc

http://www.freestudy.co.uk/thermodynamics/t4201.pdf

[Crumpp]

Originally Posted by NZtyphoon

Other aspects to be considered: coolant used; efficiency of coolant flow; thermal efficiency of engine/engine components, mechanical efficiency of same, etc etc

http://www.freestudy.co.uk/thermodynamics/t4201.pdf

That is all considered in the math.

[Crumpp]

Originally Posted by JtD

Never said that. Physics always apply. I said:
- basic principles of heat exchangers don't fully explain general aircraft engine oil temperatures
- general aircraft engine oil temperature characteristics don't fully explain Spitfire specific oil temperatures

That means, while it is comparatively easy to estimate the heat exchange in the radiator for a given set of conditions, this is just one piece of the puzzle of oil temperature calculation.

Ahhh, Spitfire physics!! Maybe research at the LHC will one day be able to explain it?

[NZtyphoon]

Originally Posted by Crumpp

Ahhh, Spitfire physics!! Maybe research at the LHC will one day be able to explain it?

Ahhh, crumpp troll! Maybe research at the Trolling Academy will one day be able to explain crumpp?