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

[JtD]

Originally Posted by ATAG_Dutch

Nothing changes here, does it?

Annoying, isn't it? I don't think this is the best subject to make generalisations, because temperature over altitude characteristics depend on aircraft, engine, engine settings, flying regime. So I suggest to find a different excuse for being rude to each other.

[NZtyphoon]

Originally Posted by JtD

Annoying, isn't it? I don't think this is the best subject to make generalisations, because temperature over altitude characteristics depend on aircraft, engine, engine settings, flying regime. So I suggest to find a different excuse for being rude to each other.

I suggest that no-one argue with Crumpp because it is patently obvious that he is THE undisputed expert on everything.

[JtD]

It's not a Crumpp problem here. The generalizations are pointless.

Indicated air speed is not equivalent to mass flow, because there's a square root over density in the IAS calculation. At a constant IAS, mass flow goes down with altitude. WW2 aircraft generally achieved lower IAS's with altitude, so mass flow goes down even more. This is countered by the reduced temperatures at altitude.

Now you can argue all day about the net effect, but unless you come up with a statistically significant number of test results, it will remain pointless. What remains is an unnecessary exchange of rudeness, which I think this forum has seen enough.

[Crumpp]

JtD,

It is a basic principle of heat exchanger efficiency. It is not really open to much discussion and the fact so much is made of such a simple thing is telling.



Bongodriver, by all means post your findings. You might learn something.

Take a guess what the p is in the formula??

Don't let that stop you from posting the findings from a turbojet. We can then change the subject to some basic properties of thrust producers! Like I said, you will learn something!

[JtD]

Originally Posted by Crumpp

It is a basic principle of heat exchanger efficiency. It is not really open to much discussion and the fact so much is made of such a simple thing is telling.

The basic principle of heat exchangers seems to be clear to everyone, including bongodriver.

But:
- 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
- detailed Spitfire oil temperature info won't change a thing in game, because development is dead

[bongodriver]

Originally Posted by Crumpp

JtD,

It is a basic principle of heat exchanger efficiency. It is not really open to much discussion and the fact so much is made of such a simple thing is telling.



Bongodriver, by all means post your findings. You might learn something.

Take a guess what the p is in the formula??

Don't let that stop you from posting the findings from a turbojet. We can then change the subject to some basic properties of thrust producers! Like I said, you will learn something!

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

I'm not posting pics for means of making revelations other than gratuitous 'look at me here at FL400 taking pics for my forum buddies', I couldn't post yesterday because I didn't make it back to home base before they closed and diverted to Luton, hotel had crappy wifi and I only had my phone, still it meant I got to take some more pics of todays sectors to Stuttgart and Sion, the latter being very Christmassy so I thought they'd go nice.

pics 1,2 on way back from Aalborg yesterday, pic 3,4 on ramp at Luton this morning, pic 5 on ramp at Stuttgart.

[bongodriver]

Heres the Christmassy ones, the amazing view approaching the Swiss Alps and the descent on the 'IGS' approach to Sion.

Merry Christmas everyone, maybe we'll be nicer to each other next year....

[fruitbat]

Nice photos, particularly like the first 2

what height were you over the alps?

[NZtyphoon]

Originally Posted by JtD

It's not a Crumpp problem here.